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Wu Z, Heffernan KS. Central blood pressure and peripheral augmentation index following acute submaximal arm versus leg exercise. Eur J Appl Physiol 2024:10.1007/s00421-024-05573-5. [PMID: 39133269 DOI: 10.1007/s00421-024-05573-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 08/06/2024] [Indexed: 08/13/2024]
Abstract
BACKGROUND Aerobic exercises like running and cycling may lower cardiovascular disease (CVD) risk through favorable effects on central blood pressure and vascular function. Arm ergometry is a popular exercise modality used in rehabilitation settings, but little is known regarding the central hemodynamic and vascular effects of this form of exercise. PURPOSE To compare the acute effects of leg versus arm exercise on central blood pressure and vascular function. METHODS Twenty-one participants (n = 11 female, Age 21 ± 3, BMI 24.5 ± 3.2 kg/m2) completed two visits to the Human Performance Laboratory. Central systolic blood pressure (cSBP), central diastolic blood pressure (cDBP), and peripheral augmentation index (pAIx) were measured using a brachial oscillometric blood pressure cuff with measures being taken before and after 20 min of acute moderate-intensity (submaximal) arm or leg cycling exercise. RESULTS There was a condition-by-time interaction for pAIx (p = 0.011). pAIx slightly increased following arm exercise but significantly decreased following leg exercise. There was a condition-by-time interaction for cDBP (p = 0.011). cDBP significantly decreased following arm exercise but increased immediately following leg exercise. There was no condition-by-time interaction for cSBP (p = 0.721). There were similar acute increases in cSBP immediately post-exercise for both conditions. CONCLUSION Arm exercise increased pAlx and decreased cDBP compared to leg exercise. As an increase in pAIx may increase left ventricular work and a reduction in cDBP may reduce coronary perfusion pressure, these findings suggest that a single bout of arm exercise may not have the same favorable acute effect on central hemodynamic load as a single bout of leg exercise.
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Affiliation(s)
- Zeyi Wu
- Department of Exercise Science, David B. Falk College of Sport and Human Dynamics, Syracuse University, Syracuse, NY, USA
| | - Kevin S Heffernan
- Department of Biobehavioral Sciences, Movement Science & Applied Physiology, Teachers College, Columbia University, 525 W 120th St, Building 528, New York, NY, USA.
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Ahmed A, Khoso NA, Arain MF, Khan IA, Javed K, Khan A, Memon SI, Fan Q, Shao J. Development of Highly Flexible Piezoelectric PVDF-TRFE/Reduced Graphene Oxide Doped Electrospun Nano-Fibers for Self-Powered Pressure Sensor. Polymers (Basel) 2024; 16:1781. [PMID: 39000637 PMCID: PMC11244387 DOI: 10.3390/polym16131781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2024] [Revised: 06/10/2024] [Accepted: 06/20/2024] [Indexed: 07/17/2024] Open
Abstract
The demand for self-powered, flexible, and wearable electronic devices has been increasing in recent years for physiological and biomedical applications in real-time detection due to their higher flexibility and stretchability. This work fabricated a highly sensitive, self-powered wearable microdevice with Poly-Vinylidene Fluoride-Tetra Fluoroethylene (PVDF-TrFE) nano-fibers using an electrospinning technique. The dielectric response of the polymer was improved by incorporating the reduced-graphene-oxide (rGO) multi-walled carbon nano-tubes (MWCNTs) through doping. The dielectric behavior and piezoelectric effect were improved through the stretching and orientation of polymeric chains. The outermost layer was attained by chemical vapor deposition (CVD) of conductive polymer poly (3,4-ethylenedioxythiophene) to enhance the electrical conductivity and sensitivity. The hetero-structured nano-composite comprises PVDF-TrFE doped with rGO-MWCNTs over poly (3,4-ethylenedioxythiophene) (PEDOT), forming continuous self-assembly. The piezoelectric pressure sensor is capable of detecting human physiological vital signs. The pressure sensor exhibits a high-pressure sensitivity of 19.09 kPa-1, over a sensing range of 1.0 Pa to 25 kPa, and excellent cycling stability of 10,000 cycles. The study reveals that the piezoelectric pressure sensor has superior sensing performance and is capable of monitoring human vital signs, including heartbeat and wrist pulse, masticatory movement, voice recognition, and eye blinking signals. The research work demonstrates that the device could potentially eliminate metallic sensors and be used for early disease diagnosis in biomedical and personal healthcare applications.
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Affiliation(s)
- Arsalan Ahmed
- Department of Textiles and Clothing, School of Engineering and Technology, National Textile University Karachi Campus, Karachi 74900, Pakistan
- Engineering Research Centre for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
- College of Materials & Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Nazakat Ali Khoso
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
- College of Materials & Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Department of Textile Engineering, Balochistan University of Information Technology, Engineering and Management Sciences (BUITEMS), Quetta 54000, Pakistan
| | - Muhammad Fahad Arain
- Department of Textiles and Clothing, School of Engineering and Technology, National Textile University Karachi Campus, Karachi 74900, Pakistan
- College of Materials & Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Imran Ahmad Khan
- Department of Textile and Apparel Science, School of Design and Textile, University of Management & Technology, Lahore 42000, Pakistan
| | - Kashif Javed
- Department of Textile and Apparel Science, School of Design and Textile, University of Management & Technology, Lahore 42000, Pakistan
| | - Asfandyar Khan
- Department of Textile and Apparel Science, School of Design and Textile, University of Management & Technology, Lahore 42000, Pakistan
- Department of Textile Engineering, Daffodil International University, Dhaka 1216, Bangladesh
| | - Sanam Irum Memon
- Textile Engineering Department, Mehran University of Engineering & Technology (MUET), Jamshoro 76062, Pakistan
| | - Qinguo Fan
- Department of Bioengineering, University of Massachusetts Dartmouth, North Dartmouth, MA 02747, USA
| | - Jianzhong Shao
- Engineering Research Centre for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
- College of Materials & Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Huang Z, Li X, Liu X, Xu Y, Feng H, Ren L. Exercise blood pressure, cardiorespiratory fitness, fatness and cardiovascular risk in children and adolescents. Front Public Health 2024; 12:1298612. [PMID: 38939566 PMCID: PMC11208708 DOI: 10.3389/fpubh.2024.1298612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 04/29/2024] [Indexed: 06/29/2024] Open
Abstract
Cardiovascular disease remains the leading cause of mortality on a global scale. Individuals who possess risk factors for cardiovascular disease, such as high blood pressure (BP) and obesity, face an elevated risk of experiencing organ-specific pathophysiological changes. This damage includes pathophysiological changes in the heart and peripheral vascular systems, such as ventricular hypertrophy, arterial stiffening, and vascular narrowing and stenosis. Consequently, these damages are associated with an increased risk of developing severe cardiovascular outcomes including stroke, myocardial infarction, heart failure, and coronary heart disease. Among all the risk factors associated with cardiovascular disease, high blood pressure emerges as the most prominent. However, conventional resting BP measurement methods such as auscultatory or oscillometric methods may fail to identify many individuals with asymptomatic high BP. Recently, exercise BP has emerged as a valuable diagnostic tool for identifying real (high) blood pressure levels and assessing underlying cardiovascular risk, in addition to resting BP measurements in adults. Furthermore, numerous established factors, such as low cardiorespiratory fitness and high body fatness, have been confirmed to contribute to exercise BP and the associated cardiovascular risk. Modifying these factors may help reduce high exercise BP and, consequently, alleviate the burden of cardiovascular disease. A significant body of evidence has demonstrated cardiovascular disease in later life have their origins in early life. Children and adolescents with these cardiovascular risk factors also possess a greater propensity to develop cardiovascular diseases later in life. Nevertheless, the majority of previous studies on the clinical utility of exercise BP have been conducted in middle-to-older aged populations, often with pre-existing clinical conditions. Therefore, there is a need to investigate further of the factors influencing exercise BP in adolescence and its association with cardiovascular risk in early life. Our previously published work showed that exercise BP is a potential useful method to detect adolescents with increased cardiovascular risk. Children and adolescents with cardiovascular risk factors are more likely to develop cardiovascular diseases later in life. However, previous studies on the clinical utility of exercise BP have largely focused on middle-to-older aged populations with pre-existing clinical conditions. Therefore, there is a need to investigate further the factors influencing exercise BP in adolescence and its association with future cardiovascular risk. Our previous studies, which focused on exercise BP measured at submaximal intensity, have shown that exercise BP is a potentially useful method for identifying adolescents at increased cardiovascular risk. Our previous findings suggest that improving cardio-respiratory fitness and reducing body fatness may help to reduce the risk of developing cardiovascular disease and improve overall cardiovascular health. These findings have important implications for the development of effective prevention and early detection strategies, which can contribute to improved public health outcomes.
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Affiliation(s)
- Zhengzheng Huang
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China
- Department of Neurology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Xiuping Li
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China
- Department of Neurology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Xia Liu
- Department of Neurology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yayun Xu
- Department of Neurology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Haixing Feng
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China
- Department of Neurology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Lijie Ren
- Department of Neurology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
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Tagawa K, Tsuru Y, Yokoi K, Aonuma T, Hashimoto J. Inverse association between obesity and aortic pressure augmentation is attenuated in women: the Wakuya study. J Hypertens 2024; 42:783-788. [PMID: 38230603 DOI: 10.1097/hjh.0000000000003657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
OBJECTIVE Pressure wave reflection predicts cardiovascular events in the general population. Obesity is negatively associated with pressure wave reflection. Muscular arterial diameter (responsible for pressure wave reflection) increases with obesity, and obesity-dependent dilation of muscular arteries is attenuated in women compared with men. We investigated the sex differences in the cross-sectional relationship between obesity and pressure wave reflection in a general population cohort. METHODS Tonometric pressure waveforms were recorded in 928 adults (mean age, 56 ± 10 years) to estimate the aortic augmentation index. The BMI was calculated using height and body weight, and waist circumference was recorded at the umbilical level. RESULTS Aortic augmentation index was significantly higher in women than in men. Indices of obesity (BMI and waist circumference) were negatively correlated with the aortic augmentation index in both men and women, even after adjusting for mean arterial pressure (both P < 0.001). Sex and BMI had no synergistic effect on the aortic augmentation index. However, when waist circumference was substituted for BMI, sex and waist circumference had a reciprocal influence on decreasing the aortic augmentation index independent of age, mean arterial pressure, diabetes, and hyperlipidemia (interaction, P = 0.045). CONCLUSION The negative correlation between overweight/obesity and aortic pressure augmentation from peripheral wave reflection is inhibited in women more than in men. Sex differences in aortic pressure augmentation are greater in individuals with central (abdominal) obesity than in those with general obesity.
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Affiliation(s)
- Kaname Tagawa
- Medical Center, Miyagi University of Education, Sendai
- Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba
| | | | | | | | - Junichiro Hashimoto
- Medical Center, Miyagi University of Education, Sendai
- Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
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Lin M, Zhang Z, Gao X, Bian Y, Wu RS, Park G, Lou Z, Zhang Z, Xu X, Chen X, Kang A, Yang X, Yue W, Yin L, Wang C, Qi B, Zhou S, Hu H, Huang H, Li M, Gu Y, Mu J, Yang A, Yaghi A, Chen Y, Lei Y, Lu C, Wang R, Wang J, Xiang S, Kistler EB, Vasconcelos N, Xu S. A fully integrated wearable ultrasound system to monitor deep tissues in moving subjects. Nat Biotechnol 2024; 42:448-457. [PMID: 37217752 DOI: 10.1038/s41587-023-01800-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 04/21/2023] [Indexed: 05/24/2023]
Abstract
Recent advances in wearable ultrasound technologies have demonstrated the potential for hands-free data acquisition, but technical barriers remain as these probes require wire connections, can lose track of moving targets and create data-interpretation challenges. Here we report a fully integrated autonomous wearable ultrasonic-system-on-patch (USoP). A miniaturized flexible control circuit is designed to interface with an ultrasound transducer array for signal pre-conditioning and wireless data communication. Machine learning is used to track moving tissue targets and assist the data interpretation. We demonstrate that the USoP allows continuous tracking of physiological signals from tissues as deep as 164 mm. On mobile subjects, the USoP can continuously monitor physiological signals, including central blood pressure, heart rate and cardiac output, for as long as 12 h. This result enables continuous autonomous surveillance of deep tissue signals toward the internet-of-medical-things.
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Affiliation(s)
- Muyang Lin
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Ziyang Zhang
- Department of Computer Science Engineering, University of California San Diego, La Jolla, CA, USA
| | - Xiaoxiang Gao
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Yizhou Bian
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Ray S Wu
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Geonho Park
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Zhiyuan Lou
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Zhuorui Zhang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Xiangchen Xu
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Xiangjun Chen
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
| | - Andrea Kang
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA, USA
| | - Xinyi Yang
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
| | - Wentong Yue
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Lu Yin
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Chonghe Wang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Baiyan Qi
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
| | - Sai Zhou
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
| | - Hongjie Hu
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Hao Huang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Mohan Li
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA, USA
| | - Yue Gu
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
- Department of Neurosurgery, Yale University, New Haven, CT, USA
| | - Jing Mu
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA
| | - Albert Yang
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
| | - Amer Yaghi
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Yimu Chen
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Yusheng Lei
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Chengchangfeng Lu
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA, USA
| | - Ruotao Wang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | - Joseph Wang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA
| | | | - Erik B Kistler
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
- Department of Anesthesiology and Critical Care, University of California San Diego, La Jolla, CA, USA
| | - Nuno Vasconcelos
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA, USA
| | - Sheng Xu
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, USA.
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA.
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA, USA.
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA.
- Department of Radiology, School of Medicine, University of California San Diego, La Jolla, CA, USA.
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Stock JM, Shenouda N, Chouramanis NV, Patik JC, Martens CR, Farquhar WB, Chirinos JA, Edwards DG. Effect of acute handgrip and aerobic exercise on wasted pressure effort and arterial wave reflections in healthy aging. Am J Physiol Heart Circ Physiol 2023; 325:H617-H628. [PMID: 37477688 PMCID: PMC10642996 DOI: 10.1152/ajpheart.00133.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 07/19/2023] [Accepted: 07/20/2023] [Indexed: 07/22/2023]
Abstract
Aging increases arterial stiffness and wave reflections that augment left ventricular wasted pressure effort (WPE). A single bout of exercise may be effective at acutely reducing WPE via reductions in arterial wave reflections. In young adults (YA) acute aerobic exercise decreases, whereas handgrip increases, wave reflections. Whether acute exercise mitigates or exacerbates WPE and arterial wave reflection in healthy aging warrants further examination. The purpose of this study was to determine if there are age-related differences in WPE and wave reflection during acute handgrip and aerobic exercise. When compared with baseline, WPE increased substantially in older adults (OA) during handgrip (5,219 ± 2,396 vs. 7,019 ± 2,888 mmHg·ms, P < 0.001). When compared with baseline, there was a robust reduction in WPE in OA during moderate-intensity aerobic exercise (5,428 ± 2,084 vs. 3,290 ± 1,537 mmHg·ms, P < 0.001), despite absolute WPE remaining higher in OA compared with YA during moderate-intensity aerobic exercise (OA 3,290 ± 1,537 vs. YA 1,188 ± 962 mmHg·ms, P < 0.001). There was no change in wave reflection timing indexed to ejection duration in OA during handgrip (40 ± 6 vs. 38 ± 4%, P = 0.41) or moderate-intensity aerobic exercise (40 ± 5 vs. 42 ± 8%, P = 0.99). Conversely, there was an earlier return of wave reflection in YA during handgrip (60 ± 11 vs. 52 ± 6%, P < 0.001) and moderate-intensity aerobic exercise (59 ± 7 vs. 51 ± 9%, P < 0.001). Changes in stroke volume were not different between groups during handgrip (P = 0.08) or aerobic exercise (P = 0.47). The greater increase in WPE during handgrip and decrease in WPE during aerobic exercise suggest that aortic hemodynamic responses to acute exercise are exaggerated with healthy aging without affecting stroke volume.NEW & NOTEWORTHY We demonstrated that acute aerobic exercise attenuated, whereas handgrip augmented, left ventricular hemodynamic load from wave reflections more in healthy older (OA) compared with young adults (YA) without altering stroke volume. These findings suggest an exaggerated aortic hemodynamic response to acute exercise perturbations with aging. They also highlight the importance of considering exercise modality when examining aortic hemodynamic responses to acute exercise in older adults.
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Affiliation(s)
- Joseph M Stock
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - Ninette Shenouda
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - Nicholas V Chouramanis
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - Jordan C Patik
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - Christopher R Martens
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - William B Farquhar
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
| | - Julio A Chirinos
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - David G Edwards
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, United States
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Battillo DJ, Malin SK. Relation of Aortic Waveforms with Gut Hormones following Continuous and Interval Exercise among Older Adults with Prediabetes. Metabolites 2023; 13:137. [PMID: 36837756 PMCID: PMC9967213 DOI: 10.3390/metabo13020137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 01/13/2023] [Indexed: 01/19/2023] Open
Abstract
Prediabetes raises cardiovascular disease risk, in part through elevated aortic waveforms. While insulin is a vasodilatory hormone, the gut hormone relation to aortic waveforms is less clear. We hypothesized that exercise, independent of intensity, would favor aortic waveforms in relation to gut hormones. Older adults (61.3 ± 1.5 yr; 33.2 ± 1.1 kg/m2) with prediabetes (ADA criteria) were randomized to undertake 60 min of work-matched continuous (CONT, n = 14) or interval (INT, n = 14) exercise for 2 wks. During a 180 min 75-g OGTT, a number of aortic waveforms (applanation tonometry) were assessed: the augmentation pressure (AP) and index (AIx75), brachial (bBP) and central blood pressure (cBP), pulse pressure (bPP and cPP), pulse pressure amplification (PPA), and forward (Pf) and backward pressure (Pb) waveforms. Acylated-ghrelin (AG), des-acylated ghrelin (dAG), GIP, and GLP-1active were measured, and correlations were co-varied for insulin. Independent of intensity, exercise increased VO2peak (p = 0.01) and PPA120min (p = 0.01) and reduced weight (p < 0.01), as well as AP120min (p = 0.02) and AIx75120min (p < 0.01). CONT lowered bSBP (p < 0.02) and bDBP (p < 0.02) tAUC180min more than INT. There were decreases dAG0min related to Pb120min (r = 0.47, p = 0.03), cPP120min (r = 0.48, p = 0.02), and AP120min (r = 0.46, p = 0.02). Declines in AG tAUC60min correlated with lower Pb120min (r = 0.47, p = 0.03) and cPP120min (r = 0.49, p = 0.02) were also found. GLP-1active 0min was reduced associated with lowered AP180min (r = 0.49, p = 0.02). Thus, while CONT exercise favored blood pressure, both intensities of exercise improved aortic waveforms in relation to gut hormones after controlling for insulin.
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Affiliation(s)
- Daniel J. Battillo
- Department of Kinesiology and Health, Rutgers University, New Brunswick, NJ 08901, USA
| | - Steven K. Malin
- Department of Kinesiology and Health, Rutgers University, New Brunswick, NJ 08901, USA
- Department of Kinesiology, University of Virginia, Charlottesville, VA 22903, USA
- Division of Endocrinology, Metabolism & Nutrition, Rutgers University, New Brunswick, NJ 08901, USA
- New Jersey Institute for Food, Nutrition and Health, Rutgers University, New Brunswick, NJ 08901, USA
- Institute of Translational Medicine and Science, Rutgers University, New Brunswick, NJ 08901, USA
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8
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Clara FM, Alfie J, Scandurra A, Fita M. The Diastolic Oscillation Amplitude Used as an Arterial Aging Indicator. Vasc Health Risk Manag 2023; 19:193-200. [PMID: 37038502 PMCID: PMC10082575 DOI: 10.2147/vhrm.s381452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 03/27/2023] [Indexed: 04/12/2023] Open
Abstract
Introduction The compliance of the distal arteries depends on their vasoconstrictor tone and distensibility and is sensitive to endothelial function and aging. C2, a component of the Windkessel model, is a measure of distal arterial compliance, and establishes the magnitude of the pressure rise during early diastole. It is calculated from the diastolic portion of the radial pulse wave using sophisticated analyses. C2 is used as a cardiovascular risk indicator since it decreases with aging, high blood pressure, and diabetes. Here, we propose an alternative method to assess the distal arteries distensibility by measuring the amplitude of the oscillation that occurs at the beginning of diastole. Methods Peripheral pulse wave was evaluated noninvasively by applanation tonometry in 511 individuals (264 women) aged between 13 and 70 years. Diastolic amplitude (DA) was measured as the peak-to-peak amplitude of the diastolic oscillation. Radial augmentation index (RAIx) and pulse wave velocity (PWV) were also calculated. Results DA decreased approximately 2% per decade of life between 16 and 70 years from 19% to 7%, and was higher in men than in women (p<0.0001). Linear regression analysis identified RAIx as the strongest predictor of AD (p<0.0001), followed by age and height. Sex modified the age-related decrease in DA (p< 0.001). By applying the method to measure DA from previously published data, we found a strong linear correlation with C2. Conclusion DA decreased linearly with age in a reciprocal manner to the increase in radial augmentation index, was greater in men than women, and was independent of blood pressure and heart rate, as previously reported for C2. We propose that measuring DA could provide an alternative index to evaluate distal arterial compliance and aging.
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Affiliation(s)
- Fernando M Clara
- Instituto de Investigaciones Científicas y Tecnológicas en Electrónica, Universidad Nacional de Mar del Plata/ CONICET, Mar del Plata, Argentina
- Unidad Cardiometabólica, Centro de Especialidades Médicas Ambulatorias, Mar del Plata, Argentina
- Correspondence: Fernando M Clara, ICyTE, UNMDP/CONICET, Av. Juan B. Justo 4302, Mar del Plata, B7600, Argentina, Tel +54 0223 481-0046, Email
| | - José Alfie
- Unidad de Hipertensión Arterial, Servicio de Clínica Médica, Hospital Italiano de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Adriana Scandurra
- Instituto de Investigaciones Científicas y Tecnológicas en Electrónica, Universidad Nacional de Mar del Plata/ CONICET, Mar del Plata, Argentina
| | - Mariana Fita
- Unidad Cardiometabólica, Centro de Especialidades Médicas Ambulatorias, Mar del Plata, Argentina
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Santos V, Massuça LM, Angarten V, Melo X, Pinto R, Fernhall B, Santa-Clara H. Arterial Stiffness following Endurance and Resistance Exercise Sessions in Older Patients with Coronary Artery Disease. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:14697. [PMID: 36429412 PMCID: PMC9690428 DOI: 10.3390/ijerph192214697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/05/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Arterial stiffness (AS) is associated with coronary artery disease (CAD). Acute endurance training decreases AS, whereas acute resistance training increases it. However, these results are from studies in apparently healthy adults, and there is no information on the effects of such afterload AS in elderly patients with CAD. We aimed to investigate the effect of acute endurance or resistance training on the time course of changes in the indices of AS in elderly patients with CAD in order to understand how stiffness responds after training. We tested 18 trained men with CAD. AS was measured using central and peripheral pulse wave velocity (PWV) after 15 min of rest and after 5, 15, and 30 min of endurance and resistance training sessions. The endurance session consisted of high-intensity interval walking at 85-90% of maximum heart rate, and the resistance session consisted of 70% of the maximum of one repetition. An interaction effect was found for central and peripheral PWV (p ≤ 0.001; carotid, η2 = 0.72; aortic, η2 = 0.90; femoral, η2 = 0.74), which was due to an increase in PWV after resistance and a decrease in central and peripheral PWV after endurance. This study demonstrates that training mode influences the time course of AS responses to acute exercise in these patients. Acute endurance training decreased AS, whereas resistance training significantly increased it.
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Affiliation(s)
- Vanessa Santos
- CIPER, Exercise and Health Laboratory, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz Quebrada, 1649-004 Lisbon, Portugal
- KinesioLab, Research Unit in Human Movement Analysis, Instituto Piaget, 2805-059 Almada, Portugal
| | - Luís Miguel Massuça
- ICPOL Research Center, Higher Institute of Police Sciences and Internal Security, 1349-040 Lisbon, Portugal
- CIDEFES—Research Center in Sport, Physical Education, Exercise and Health, Lusófona University, 1749-024 Lisbon, Portugal
| | - Vitor Angarten
- CIPER, Exercise and Health Laboratory, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz Quebrada, 1649-004 Lisbon, Portugal
| | - Xavier Melo
- CIPER, Exercise and Health Laboratory, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz Quebrada, 1649-004 Lisbon, Portugal
- Egas Moniz Interdisciplinary Research Center (CiiEM), Egas Moniz School of Health, 2829-511 Almada, Portugal
| | - Rita Pinto
- Structural and Coronary Heart Disease Unit, Centro Cardiovascular da Universidade de Lisboa (CCUL@RISE), Faculty of Medicine, University of Lisbon, 1649-004 Lisbon, Portugal
| | - Bo Fernhall
- College of Nursing and Health Sciences, University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, MA 02125-3393, USA
| | - Helena Santa-Clara
- CIPER, Exercise and Health Laboratory, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz Quebrada, 1649-004 Lisbon, Portugal
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10
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Ghosh SK, Kim J, Kim MP, Na S, Cho J, Kim JJ, Ko H. Ferroelectricity-Coupled 2D-MXene-Based Hierarchically Designed High-Performance Stretchable Triboelectric Nanogenerator. ACS NANO 2022; 16:11415-11427. [PMID: 35833721 DOI: 10.1021/acsnano.2c05531] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Triboelectric nanogenerators based on the state-of-the-art functional materials and device engineering provide an exciting platform for future multifunctional electronics, but it remains challenging to realize due to the lack of in-depth understanding on the functional properties of nanomaterials that are compatible with microstructural engineering. In this study, a high-performance stretchable (∼60% strain) triboelectric nanogenerator is demonstrated via an interlocked microstructural device configuration sandwiched between silver-nanowire-(Ag-NW) electrodes and hierarchically engineered spongy thermoplastic polyurethane (TPU) polymer composite with ferroelectric barium-titanate-coupled (BTO-coupled) 2D MXene (Ti3C2Tx) nanosheets. The use of MXene results in an increase in the dielectric constant whereas the dielectric loss is lowered via coupling with the ferroelectricity of BTO, which increases the overall output performance of the nanogenerator. The spongy nature of the composite film increases the capacitance variation under deformation, which results in improved energy-conversion efficiency (∼79%) and pressure sensitivity (4.6 VkPa-1 and 2.5 mAkPa-1) of the device. With the quantum-mechanically calculated electronic structure, the device converts biomechanical energy to electrical energy and generates an open-circuit output voltage of 260 V, short-circuit output current of 160 mA/m2, and excellent power output of 6.65 W/m2, which is sufficient to operate several consumer electronics. Owing to its superior pressure sensitivity and efficiency, the device enables a broad range of applications including real-time clinical human vital-sign monitoring, acoustic sensing, and multidimensional gesture-sensing functionality of a robotic hand. Considering the ease of fabrication, excellent functionality of the hierarchical polymer nanocomposite, and outstanding energy-harvesting performance of nanogenerators, this work is expected to stimulate the development of next-generation self-powered technology.
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Affiliation(s)
- Sujoy Kumar Ghosh
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City 44919, Republic of Korea
| | - Jinyoung Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City 44919, Republic of Korea
| | - Minsoo P Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City 44919, Republic of Korea
| | - Sangyun Na
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City 44919, Republic of Korea
| | - Jeonghoon Cho
- School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Jae Joon Kim
- School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Hyunhyub Ko
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City 44919, Republic of Korea
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11
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Gaynor-Metzinger SHA, Triplett NT, Meucci M, Fasczewski KS, Flinchum DH, Collier SR. Central arterial stiffness, wave reflection, and heart rate variability following 4-week high-intensity resistance training intervention in young active women. Eur J Appl Physiol 2022; 122:2283-2293. [DOI: 10.1007/s00421-022-05003-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 06/28/2022] [Indexed: 12/22/2022]
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12
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Zuo C, Bo S, Li Q, Zhang L. The Effect of Whole-Body Traditional and Functional Resistance Training on CAVI and Its Association With Muscular Fitness in Untrained Young Men. Front Physiol 2022; 13:888048. [PMID: 35694401 PMCID: PMC9174581 DOI: 10.3389/fphys.2022.888048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Resistance training-induced changes in the muscle function is essential for the health promotion of the young and older, but the discrepancies of the effect of resistance training on arterial stiffness leads to the divergence regarding to the effect of resistance training on cardiovascular health. What confuses our understanding in this field may be the following factors: external load (higher intensity vs. lighter intensity), participants’ cardiovascular health, and arterial stiffness assessment measurement. The purpose of the present study was to investigate the effects of the whole-body traditional high-intensity vs. functional low-intensity resistance training protocol on systemic arterial stiffness, and their association with muscular fitness components in untrained young men. Methods: In this randomized controlled trial, twenty-nine untrained young men (mean age about 22.5 years old) were randomized into a 6-weeks (three sessions per week) supervised whole-body traditional high-intensity resistance group (TRT, n = 15) consisting of 4–5 sets of 12 repetitions (70%1RM, lower-repetitions) or a whole-body functional low-intensity resistance group (FRT, n = 14) with 4–5 sets of 20 repetitions (40%1RM, higher-repetitions) to volitional failure. The systemic arterial stiffness (cardio-ankle vascular index, CAVI) and muscular fitness components were assessed before and after the 6-weeks training program. Results: There was a significant decrease (pre-post) for CAVI only in FRT group (p < 0.05), but no significant difference was observed between two groups. In addition, the TRT and FRT groups showed equally significantly increased in maximal strength, muscular endurance and power (within group: both p < 0.01); however, the independent t test exhibited that the difference between two groups in terms of change in maximal strength, muscular endurance and power were no significant (p > 0.05). Furthermore, the reduction in CAVI was negatively correlated with the increase in 1RM of bench press for all participants (r = −0.490, p < 0.01). Conclusion:Using present criterion-standard assessments measurements demonstrates that CAVI was significantly reduced after 6-weeks functional resistance training with beneficial effect on muscular fitness. Negative and significant association between CAVI and 1RM bench press indicated the cardiovascular health may be involved in the regulation of resistance training.
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Affiliation(s)
- Chongwen Zuo
- Graduate Department of Capital University of Physical Education and Sports, Beijing, China
| | - Shumin Bo
- School of Kinesiology and Health of Capital University of Physical Education and Sports, Beijing, China
- *Correspondence: Shumin Bo,
| | - Qing Li
- Graduate Department of Capital University of Physical Education and Sports, Beijing, China
| | - Li Zhang
- Graduate Department of Capital University of Physical Education and Sports, Beijing, China
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13
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Nagel T, Melton B, Grosicki GJ. Fighting arterial stiffness: A case for the importance of cardiorespiratory fitness in firefighters. Med Hypotheses 2022. [DOI: 10.1016/j.mehy.2022.110831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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14
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Zuo C, Li Q, Zhang L, Bo S. Effects of 6-Week Traditional and Functional Resistance Training on Arterial Stiffness and Muscular Strength in Healthy Young Men. Front Physiol 2022; 13:859402. [PMID: 35309075 PMCID: PMC8924443 DOI: 10.3389/fphys.2022.859402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 02/15/2022] [Indexed: 12/13/2022] Open
Abstract
Background The present study investigated the effects of traditional resistance training (TRT) and functional resistance training (FRT) on arterial stiffness and muscular strength in healthy young men. Methods This randomized controlled trial included 29 untrained healthy young men aged 18–29 years who were randomly divided into two groups, namely, TRT group (n = 15) and FRT group (n = 14). All participants underwent numerous tests, such as those for body composition, cardio-ankle vascular index, blood pressure, heart rate, and maximal strength before and after the 6-week training program. The exercise training comprised whole-body strength training exercises 3 days a week for 6 weeks. The total training volume and number of sets (4–5 sets) were kept constantly similar in each group. The TRT group completed 4–5 sets of 8–12 repetitions [70% of 1 repetition maximum (1RM)], whereas the FRT group completed 4–5 sets of 15–22 repetitions (40% 1RM). Results The TRT and FRT groups exhibited equally significantly increased maximal strength (within group: both p < 0.01). Furthermore, the independent t-test showed that the differences between the two groups in terms of changes in maximal strength were no significant (between group: both p > 0.05). Additionally, significant main effects of time (pre vs. post) were observed for the left and right cardio-ankle vascular indices (p < 0.05); however, no significant difference were observed between the groups. For body compositions outcome measures, no significant differences between groups were observed. Conclusion Six weeks of FRT and TRT exhibit no difference in terms of effects on arterial stiffness and muscular strength.
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Affiliation(s)
- Chongwen Zuo
- Graduate Department, Capital University of Physical Education and Sports, Beijing, China
| | - Qing Li
- Graduate Department, Capital University of Physical Education and Sports, Beijing, China
| | - Li Zhang
- Graduate Department, Capital University of Physical Education and Sports, Beijing, China
| | - Shumin Bo
- School of Kinesiology and Health, Capital University of Physical Education and Sports, Beijing, China
- *Correspondence: Shumin Bo,
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15
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Huang Z, Chen G, Wang X, Zang Y, Yue Q, Cai Z, Ding X, Chen Z, Cai Z, Wu K, Zheng H, Wu W, Wu S, Chen Y. The effect of acute aerobic exercise on arterial stiffness in individuals with different body fat percentages: A cross-sectional study. Front Cardiovasc Med 2022; 9:1072191. [PMID: 36712258 PMCID: PMC9874153 DOI: 10.3389/fcvm.2022.1072191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 12/29/2022] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Body fat percentage were positively correlated with arterial stiffness, but the acute change in arterial stiffness after aerobic exercise in individuals with different body fat percentages remains unclear. This study was aimed to determine the effect of acute aerobic exercise on arterial stiffness in individuals with different body fat percentages. METHODS Individuals who both participated in the seventh survey of the Kailuan study and the fifth iteration of National Physical Fitness Monitoring were enrolled in our study. All participants underwent measurement of brachial-ankle pulse wave velocity, blood pressure, and heart rate before and after a two-stage load test on cycle ergometry. Additionally, the generalized linear model was established to analyse between-group differences of the change in brachial-ankle pulse wave velocity before and after exercise for individuals with different body fat percentages. RESULTS The participants (N = 940, 36.8 ± 7.7years old, all male) were divided into: Q1 10.0-19.3%, Q2 19.3-23.3%, Q3 23.3-27.1% and Q4 27.1-37.7% by body fat percentage quartile. Overall, after exercise, brachial-ankle pulse wave velocity decreased significantly (before, 1,375.1 ± 209.1; after, 1,341.5 ± 208.0cm/s; p < 0.01). After adjusting for confounding factors, the generalized linear model showed that the β values and 95% confidence interval (CI) of Q1, Q2 and Q3 groups were -38.1 (95% CI: -57.3, -19.0), -8.5 (95% CI: -25.8, 3.7),-3.7 (95% CI: -20.5, 13.0), respectively, when compared with Q4. For an increase in body fat percentage by one standard deviation (5.8%), β = 14.5 (95% CI: 7.3, 21.6). Similar results were obtained in sensitivity analyses. CONCLUSIONS Acute aerobic exercise had a positive effect on the arterial stiffness of adults with different body fat percentages. Compared with individuals with high body fat percentages, the arterial stiffness of people with low body fat percentages had significant reduction after exercise.
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Affiliation(s)
- Zegui Huang
- Shantou University Medical College, Shantou, China
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Guanzhi Chen
- Second Clinical College, China Medical University, Shenyang, China
| | - Xianxuan Wang
- Shantou University Medical College, Shantou, China
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Yiran Zang
- Graduate School, North China University of Science and Technology, Tangshan, China
| | - Qing Yue
- Graduate School, North China University of Science and Technology, Tangshan, China
| | - Zefeng Cai
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Xiong Ding
- School of Public Health, Wuhan University, Wuhan, China
| | - Zekai Chen
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Zhiwei Cai
- Shantou University Medical College, Shantou, China
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Kuangyi Wu
- Shantou University Medical College, Shantou, China
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Huancong Zheng
- Shantou University Medical College, Shantou, China
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Weiqiang Wu
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Shouling Wu
- Department of Cardiology, Kailuan General Hospital, Tangshan, China
- *Correspondence: Shouling Wu ✉
| | - Youren Chen
- Department of Cardiology, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
- Youren Chen ✉
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16
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Lee E, Kostensalo J, Willeit P, Kunutsor SK, Laukkanen T, Zaccardi F, Khan H, Laukkanen JA. Standalone sauna vs exercise followed by sauna on cardiovascular function in non-naïve sauna users: A comparison of acute effects. Health Sci Rep 2021; 4:e393. [PMID: 34622026 PMCID: PMC8485612 DOI: 10.1002/hsr2.393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 09/03/2021] [Accepted: 09/06/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND AND AIMS Sauna bathing and aerobic exercise have each been shown to affect cardiovascular function. However, direct comparisons between standalone sauna bathing and a combination of exercise and sauna on vascular indices remain limited. Therefore, we conducted a cross-over study using matched durations to explore the hemodynamic changes of sauna exposure when compared to a combination of aerobic exercise and sauna exposure. METHODS Participants (N = 72) with at least one cardiovascular risk factor underwent, on two separate occasions: (a) a 30-minute sauna at 75°C (SAUNA) and (b) the combination of a 15-minute cycling exercise at 75% maximum heart rate followed by 15-minute sauna exposure (EX+SAUNA). Relative changes to arterial stiffness (PWV), augmentation index (Alx), brachial systolic and diastolic blood pressure (SBP and DBP), central SBP (cSBP), mean arterial pressure (MAP), and heart rate (HR) were compared PRE-POST and pre- to 30-minutes post-intervention (PRE-POST30). RESULTS Baseline SBP and DBP were 143 (SD 18) mmHg and 86 (SD 10) mmHg, respectively. From PRE-POST, SAUNA had lower DBP (mean difference [95% CI] 2.5 [1.0, 4.1], P = .002) and MAP (2.5 [0.6, 4.3], P = .01). However, EX+SAUNA had lower SBP (-2.7 [-4.8, -0.5], P = .02), DBP (-1.8 [-3.3, -0.4], P = .01), and MAP (-2.0 [-3.5, -0.5], P = .009) PRE-POST30. There were no statistically significant differences between SAUNA and EX+SAUNA for other measured parameters. CONCLUSION This study demonstrated that when matched for duration, EX+SAUNA and SAUNA elicit comparable acute hemodynamic alterations in middle-aged participants with cardiovascular risk factors. The sauna is a suitable option for acute blood pressure reductions in those who are unable to perform aerobic exercise, and may be a viable lifestyle treatment option to improve blood pressure control.
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Affiliation(s)
- Earric Lee
- Faculty of Sport and Health Sciences University of Jyväskylä Jyväskylä Finland
| | - Joel Kostensalo
- Faculty of Mathematics and Science University of Jyväskylä Jyväskylä Finland
| | - Peter Willeit
- Department of Neurology Medical University of Innsbruck Innsbruck Austria
- Department of Public Health and Primary Care University of Cambridge Cambridge UK
| | - Setor K Kunutsor
- National Institute for Health Research Bristol Biomedical Research Centre University Hospitals Bristol and Weston NHS Foundation Trust and the University of Bristol Bristol UK
- Translational Health Sciences, Bristol Medical School University of Bristol, Learning & Research Building (Level 1), Southmead Hospital Bristol UK
| | - Tanjaniina Laukkanen
- Institute of Public Health and Clinical Nutrition University of Eastern Finland Kuopio Finland
| | | | - Hassan Khan
- Division of Cardiology, Department of Medicine Emory University Atlanta Georgia USA
| | - Jari A Laukkanen
- Faculty of Sport and Health Sciences University of Jyväskylä Jyväskylä Finland
- Department of Internal Medicine Central Finland Health Care District Jyväskylä Finland
- Institute of Clinical Medicine University of Eastern Finland Kuopio Finland
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Tai YL, Marshall EM, Parks JC, Kingsley JD. Hemodynamic response and pulse wave analysis after upper- and lower-body resistance exercise with and without blood flow restriction. Eur J Sport Sci 2021; 22:1695-1704. [PMID: 34529554 DOI: 10.1080/17461391.2021.1982018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Resistance exercise (RE) has been shown to elevate hemodynamics and pulse wave reflection. However, the effects of acute RE with blood flow restriction (BFR) on hemodynamics and pulse wave reflection are unclear. The purpose of this study was to evaluate the differences between upper- and lower-body RE with and without BFR on hemodynamics and pulse wave reflection. Twenty-three young resistance-trained individuals volunteered for the study. Hemodynamics and pulse wave reflection were assessed at rest, 10, 25, 40, and 55 min after either upper- or lower-body with or without BFR. The upper-body RE (URE) consisted of the latissimus dorsi pulldown and chest press; the lower-body RE (LRE) consisted of knee extension and knee flexion. The BFR condition consisted of four sets of 30, 15, 15, and 15 repetitions at 30% 1-repetition maximum (1RM) while the without BFR condition consisted of four sets of 8 repetitions at 70% 1RM. Heart rate, rate pressure product, and subendocardial viability ratio significantly (p < 0.05) increased after all exercises. Brachial and aortic systolic blood pressure (BP) significantly (p < 0.05) elevated after LRE while brachial and aortic diastolic BP significantly (p < 0.05) reduced after URE. Augmentation pressure, augmentation index (AIx), AIx normalized at 75 bpm, and wasted left ventricular pressure energy significantly (p < 0.05) increased after URE while transit time of reflected wave significantly (p < 0.05) decreased after LRE. URE places greater stress on pulse wave reflection while LRE results in greater responses in BP. Regardless of URE or LRE, the cardiovascular responses between BFR and without BFR are similar.HIGHLIGHTS High-load resistance exercise and low-load resistance exercise with blood flow restriction may produce similar cardiovascular responses.Upper-body resistance exercise generates greater changes on pulse wave reflections while lower-body resistance exercise induces greater elevations in systolic blood pressure.
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Affiliation(s)
- Yu Lun Tai
- Department of Health and Human Performance, University of Texas Rio Grande Valley, Brownsville, TX, USA.,Exercise Science and Exercise Physiology, Kent State University, Kent, OH, USA
| | - Erica M Marshall
- Exercise Science, Florida Southern College, Lakeland, FL, USA.,Exercise Science and Exercise Physiology, Kent State University, Kent, OH, USA
| | - Jason C Parks
- State University of New York Cortland, Cortland, NY, USA.,Exercise Science and Exercise Physiology, Kent State University, Kent, OH, USA
| | - J Derek Kingsley
- Exercise Science and Exercise Physiology, Kent State University, Kent, OH, USA
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18
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Góis Leandro C, Arnaut Brinco R, Góes Nobre G, Góes Nobre I, Silva-Santiago LC, Aires-Dos-Santos BR, Marinho-Dos-Santos R, Rodrigues-Ribeiro M, Marinho-Barros MR, Alves-Macedo F, Brito-Almeida M, Tchamo ME, Costa-Silva JH, Moura-Dos-Santos MA. Post-exercise hypotension effects in response to plyometric training of 7- to 9-year-old boys with overweight/obesity: a randomized controlled study. J Sports Med Phys Fitness 2021; 61:1281-1289. [PMID: 34610730 DOI: 10.23736/s0022-4707.20.11648-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Physical activity plays an important role on children with obesity. This study evaluated the effects of plyometric training on the anthropometry, body composition, and the blood pressure (BP) and heart rate (HR) of boys with obesity. METHODS Boys aged 7 to 9 years old were divided in: non-trained (N.=12) and trained (N.=29). The plyometric training program consisted of jumps on nonconsecutive days for twelve weeks. Anthropometry and body composition, BP and HR were evaluated. BP, HR and rate-pressure product were recorded at rest and 2 minutes after the section. Two-way repeated factors ANOVA was used. RESULTS Trained group had a reduction in skinfolds and an increase in free fat mass (within and between-groups) and a large effect size for most anthropometric and body composition variables. Late systolic response was reduced from 122±1.1 (immediately post-exercise at the first week) to 112±1.0 at the end of plyometric training period. Diastolic reduction was seen two minutes after each session of exercise (from 68±1.1 to 62±1.2). HR was reduced in response to plyometric training (108 bpm to 97 bpm). CONCLUSIONS Our findings strengthen previous studies that suggest that intense exercise has significant adaptive effects on BP and HR.
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Affiliation(s)
- Carol Góis Leandro
- Department of Nutrition, Federal University of Pernambuco, Recife, Brazil -
| | | | - Gabriela Góes Nobre
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Isabele Góes Nobre
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | | | - Bruno R Aires-Dos-Santos
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Ravi Marinho-Dos-Santos
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Marcílio Rodrigues-Ribeiro
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Marcos R Marinho-Barros
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Fernanda Alves-Macedo
- Department of Nursing, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Marcelus Brito-Almeida
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Mário E Tchamo
- Department of Physical Education, Pedagogical University of Maputo, Maputo, Mozambique
| | - João H Costa-Silva
- Department of Physical Education and Sports Science, Academic Center of Vitória (CAV), Federal University of Pernambuco, Vitória de Santo Antão, Brazil
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Stock JM, Chirinos JA, Edwards DG. Lower-body dynamic exercise reduces wave reflection in healthy young adults. Exp Physiol 2021; 106:1720-1730. [PMID: 33999464 DOI: 10.1113/ep089581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/14/2021] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? There is a paradoxical reduction in augmentation index during lower-body dynamic (LBD) exercise in the face of an increase in central pressure. To determine causality, the amplitudes of forward and backward pressure waves were assessed separately using wave separation analysis. What is the main finding and its importance? Reflection magnitude decreased during LBD exercise in healthy young adults and was attributable to an increased forward pressure wave amplitude and decreased backward pressure wave amplitude. This vasoactive response might limit the adverse effects of wave reflection during LBD exercise, optimizing ventricular-arterial interactions. ABSTRACT Acute lower-body dynamic (LBD) exercise decreases surrogate measures of wave reflection, such as the augmentation index. However, the augmentation index is influenced by the combined effects of wave reflection timing, magnitude and other confounding factors external to wave reflection, which make it difficult to discern the origin of changes in surrogate measures. The relative contributions of forward (Pf) and backward (Pb) pressure wave amplitudes to central pressure can be determined by wave separation analysis. Reflection magnitude (RM = Pb/Pf) and the timing of apparent wave reflection return can also be determined. We tested the hypothesis that acute LBD exercise decreases RM and reflected wave transit time (RWTT). Applanation tonometry was used to record radial artery pressure waveforms in 25 adults (24 ± 4 years of age) at baseline and during light-, moderate- and vigorous-intensity exercise. Wave separation analysis was conducted offline using a personalized physiological flow wave to determine Pf, Pb, RM and RWTT. The RM decreased during all intensities of exercise compared with baseline (all P < 0.001; baseline, 43 ± 5%; light, 33 ± 6%; moderate, 23 ± 7%; vigorous, 17 ± 5%). The reduction in RM was attributable to the combined effect of increased Pf and decreased Pb during exercise. The RWTT decreased during all intensities of exercise compared with baseline (all P < 0.04; baseline, 156 ± 17 ms; light, 144 ± 15 ms; moderate, 129 ± 16 ms; vigorous, 121 ± 17 ms). Lastly, in a stepwise multilinear regression, Pf, but not Pb and RWTT, contributed to increased central pulse pressure during LBD exercise. These data show that wave reflection decreased and that central pulse pressure is most influenced by Pf during LBD exercise.
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Affiliation(s)
- Joseph M Stock
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, USA
| | - Julio A Chirinos
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - David G Edwards
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, USA
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Patik JC, Stock JM, Shenouda N, Chouramanis NV, Mehrer JD, Chirinos JA, Edwards DG. Pulsatile load and wasted pressure effort are reduced following an acute bout of aerobic exercise. J Appl Physiol (1985) 2021; 131:184-191. [PMID: 33982596 DOI: 10.1152/japplphysiol.00946.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Following aerobic exercise, sustained vasodilation and concomitant reductions in total peripheral resistance (TPR) result in a reduction in blood pressure that is maintained for two or more hours. However, the time course for postexercise changes in reflected wave amplitude and other indices of pulsatile load on the left ventricle have not been thoroughly described. Therefore, we tested the hypothesis that reflected wave amplitude is reduced beyond an hour after cycling at 60% V̇o2peak for 60 min. Aortic pressure waveforms were derived in 14 healthy adults (7 men, 7 women; 26 ± 3 yr) from radial pulse waves acquired via high-fidelity applanation tonometry at baseline and every 20 min for 120 min postexercise. Concurrently, left ventricle outflow velocities were acquired via Doppler echocardiography and pressure-flow analyses were performed. Aortic characteristic impedance (Zc), forward (Pf) and backward (Pb) pulse wave amplitude, reflected wave travel time (RWTT), and wasted pressure effort (WPE) were derived. Reductions in aortic blood pressure, Zc, Pf, and Pb were all sustained postexercise whereas increases in RWTT emerged from 60 to 100 min post exercise (all P < 0.05). WPE was reduced by ∼40% from 40 to 100 min post exercise (all P < 0.02). Stepwise multiple regression analysis revealed that the peak ΔWPE was associated with ΔRWTT (β = -0.57, P = 0.003) and ΔPb (β = 0.52, P = 0.006), but not Δcardiac output, ΔTPR, ΔZc, or ΔPf. These results suggest that changes in pulsatile hemodynamics are sustained for ≥100 min following moderate intensity aerobic exercise. Moreover, decreased and delayed reflected pressure waves are associated with decreased left ventricular wasted effort after exercise.NEW & NOTEWORTHY We demonstrate that pulsatile load on the left ventricle is diminished following 60 min of moderate intensity aerobic exercise. During recovery from exercise, the amplitude of the forward and backward traveling pressure waves are attenuated and the arrival of reflected waves is delayed. Thus, the work imposed upon the left ventricle by reflected pressure waves, wasted pressure effort, is decreased after exercise.
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Affiliation(s)
- Jordan C Patik
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Joseph M Stock
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Ninette Shenouda
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Nicholas V Chouramanis
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Justin D Mehrer
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Julio A Chirinos
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - David G Edwards
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
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Effects of Post-Exertional Malaise on Markers of Arterial Stiffness in Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18052366. [PMID: 33671082 PMCID: PMC7957494 DOI: 10.3390/ijerph18052366] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 02/19/2021] [Accepted: 02/20/2021] [Indexed: 01/03/2023]
Abstract
Background: Evidence is emerging that individuals with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) may suffer from chronic vascular dysfunction as a result of illness-related oxidative stress and vascular inflammation. The study aimed to examine the impact of maximal-intensity aerobic exercise on vascular function 48 and 72 h into recovery. Methods: ME/CFS (n = 11) with gender and age-matched controls (n = 11) were randomly assigned to either a 48 h or 72 h protocol. Each participant had measures of brachial blood pressure, augmentation index (AIx75, standardized to 75 bpm) and carotid-radial pulse wave velocity (crPWV) taken. This was followed by a maximal incremental cycle exercise test. Resting measures were repeated 48 or 72 h later (depending on group allocation). Results: No significant differences were found when ME/CFS were directly compared to controls at baseline. During recovery, the 48 h control group experienced a significant 7.2% reduction in AIx75 from baseline measures (p < 0.05), while the matched ME/CFS experienced no change in AIx75. The 72 h ME/CFS group experienced a non-significant increase of 1.4% from baseline measures. The 48 h and 72 h ME/CFS groups both experienced non-significant improvements in crPWV (0.56 ms−1 and 1.55 ms−1, respectively). Conclusions: The findings suggest that those with ME/CFS may not experience exercise-induced vasodilation due to chronic vascular damage, which may be a contributor to the onset of post-exertional malaise (PEM).
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Effects of aerobic, resistance and concurrent exercise on pulse wave reflection and autonomic modulation in men with elevated blood pressure. Sci Rep 2021; 11:760. [PMID: 33436986 PMCID: PMC7804273 DOI: 10.1038/s41598-020-80800-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 12/28/2020] [Indexed: 12/03/2022] Open
Abstract
The acute effects of exercise modes on pulse wave reflection (PWR) and their relationship with autonomic control remain undefined, particularly in individuals with elevated blood pressure (BP). We compared PWR and autonomic modulation after acute aerobic (AE), resistance (RE), and concurrent exercise (CE) in 15 men with stage-1 hypertension (mean ± SE: 34.7 ± 2.5 years, 28.4 ± 0.6 kg/m2, 133 ± 1/82 ± 2 mmHg). Participants underwent AE, RE, and CE on different days in counterbalanced order. Applanation tonometry and heart rate variability assessments were performed before and 30-min postexercise. Aortic pressure decreased after AE (− 2.4 ± 0.7 mmHg; P = 0.01), RE (− 2.2 ± 0.6 mmHg; P = 0.03), and CE (− 3.1 ± 0.5 mmHg; P = 0.003). Augmentation index remained stable after RE, but lowered after AE (− 5.1 ± 1.7%; P = 0.03) and CE (− 7.6 ± 2.4% P = 0.002). Systolic BP reduction occurred after CE (− 5.3 ± 1.9 mmHg). RR-intervals and parasympathetic modulation lowered after all conditions (~ 30–40%; P < 0.05), while the sympathovagal balance increased after RE (1.2 ± 0.3–1.3 ± 0.3 n.u., P < 0.05). Changes in PWR correlated inversely with sympathetic and directly with vagal modulation in CE. In conclusion, AE, RE, and CE lowered central aortic pressure, but only AE and CE reduced PWR. Overall, those reductions related to decreased parasympathetic and increased sympathetic outflows. Autonomic fluctuations seemed to represent more a consequence than a cause of reduced PWR.
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Li T, Qu M, Carlos C, Gu L, Jin F, Yuan T, Wu X, Xiao J, Wang T, Dong W, Wang X, Feng ZQ. High-Performance Poly(vinylidene difluoride)/Dopamine Core/Shell Piezoelectric Nanofiber and Its Application for Biomedical Sensors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2006093. [PMID: 33274802 DOI: 10.1002/adma.202006093] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/31/2020] [Indexed: 05/22/2023]
Abstract
Fabrication of soft piezoelectric nanomaterials is essential for the development of wearable and implantable biomedical devices. However, a big challenge in this soft functional material development is to achieve a high piezoelectric property with long-term stability in a biological environment. Here, a one-step strategy for fabricating core/shell poly(vinylidene difluoride) (PVDF)/dopamine (DA) nanofibers (NFs) with a very high β-phase content and self-aligned polarization is reported. The self-assembled core/shell structure is believed essential for the formation and alignment of β-phase PVDF, where strong intermolecular interaction between the NH2 groups on DA and the CF2 groups on PVDF is responsible for aligning the PVDF chains and promoting β-phase nucleation. The as-received PVDF/DA NFs exhibit significantly enhanced piezoelectric performance and excellent stability and biocompatibility. An all-fiber-based soft sensor is fabricated and tested on human skin and in vivo in mice. The devices show a high sensitivity and accuracy for detecting weak physiological mechanical stimulation from diaphragm motions and blood pulsation. This sensing capability offers great diagnostic potential for the early assessment and prevention of cardiovascular diseases and respiratory disorders.
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Affiliation(s)
- Tong Li
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Minghe Qu
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
| | - Corey Carlos
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Long Gu
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Fei Jin
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
| | - Tao Yuan
- Department of Orthopedic, Nanjing Jinling Hospital, Nanjing, 210002, P. R. China
| | - Xiaowei Wu
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
| | - Jijun Xiao
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
| | - Ting Wang
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, P. R. China
| | - Wei Dong
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
| | - Xudong Wang
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Zhang-Qi Feng
- School of Chemical Engineering, Nanjing University of Science and Technology, #200 Xiaolingwei, Nanjing, 210094, P. R. China
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Harber MP, McCurry A, Carlini N, Kistler B, Fleenor BS. Caffeine ingestion alters central hemodynamics following aerobic exercise in middle-aged men. Eur J Appl Physiol 2020; 121:435-443. [PMID: 33098463 DOI: 10.1007/s00421-020-04521-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 10/01/2020] [Indexed: 12/21/2022]
Abstract
PURPOSE To examine the acute influence of caffeine on post-exercise central blood pressures, arterial stiffness, and wave reflection properties. METHODS In a double-blind randomized placebo-controlled crossover study design, ten middle-aged males (55 ± 5 year) completed two exercise trials after ingestion of caffeine (400 mg) or placebo. Measurements were taken before and 30 min post-ingestion via cuff-based pulse wave analysis (PWA) and carotid-femoral pulse wave velocity (PWV). Participants performed a 40-min cycling bout at 70% HRmax with matched workloads between trials. PWA and PWV were reassessed 30 min post-exercise. RESULTS Prior to exercise, compared to placebo, caffeine increased brachial systolic blood pressure (bSBP) (+ 12.3 ± 2.4 mmHg; p = 0.004), brachial diastolic blood pressure (bDBP) (+ 7.7 ± 0.9 mmHg; p = 0.011), central systolic blood pressure (cSBP) (+ 11.1 ± 2.1 mmHg; p = 0.005) and central diastolic blood pressure (cDBP) (+ 7.6 ± 1.0 mmHg; p = 0.012). PWV was higher 30 min after pill ingestion (p = 0.021 for time) with a trend for a greater increase in caffeine (p = 0.074 for interaction). bSBP (p = 0.036) and cSBP (p = 0.007) were lower after exercise but remained higher (both p < 0.001) in caffeine compared to placebo. PWV remained higher (p = 0.023) after exercise in caffeine compared to placebo but was not influenced by exercise. At rest, augmentation pressure (AP) and index (AIx) were not influenced by caffeine ingestion. Conversely, AIx was lower (p = 0.009) after exercise in placebo only. CONCLUSION In healthy and active middle-aged men, pre-exercise caffeine ingestion led to higher central and peripheral systolic blood pressures, PWV and AIx at 30 min post-exercise, indicating an increased left ventricular workload which may have implications for cardiovascular event risk.
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Affiliation(s)
- Matthew P Harber
- Clinical Exercise Physiology, Human Performance Laboratory, Ball State University, Muncie, IN, 47306, USA.
| | - Allison McCurry
- Clinical Exercise Physiology, Human Performance Laboratory, Ball State University, Muncie, IN, 47306, USA
| | - Nicholas Carlini
- Clinical Exercise Physiology, Human Performance Laboratory, Ball State University, Muncie, IN, 47306, USA
| | - Brandon Kistler
- Nutrition and Dietetics, Ball State University, Muncie, IN, USA
| | - Bradley S Fleenor
- Clinical Exercise Physiology, Human Performance Laboratory, Ball State University, Muncie, IN, 47306, USA
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Guan H, Meng J, Cheng Z, Wang X. Processing Natural Wood into a High-Performance Flexible Pressure Sensor. ACS APPLIED MATERIALS & INTERFACES 2020; 12:46357-46365. [PMID: 32967417 DOI: 10.1021/acsami.0c12561] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Flexible pressure sensors have received wide attention because of their potential applications in wearable electronics and electronic skins (e-skins). However, the high performance of the pressure sensors relies principally on the introduction of complex surface microstructures, which often involves either complicated procedures or costly microfabrication methods. Moreover, these devices predominantly use synthetic polymers as flexible substrates, which are generally nonbiodegradable or not ecofriendly. Here, we report a facile and scalable processing strategy to convert naturally rigid wood into reduced graphene oxide (rGO)-modified flexible wood (FW/rGO) via saw cutting, chemical treatment, and rGO coating, resulting in high-performance wood-based flexible piezoresistive pressure sensors. Benefiting from the largely deformable ribbon-like surface microstructures, the obtained wood-based pressure sensor displayed a high sensitivity of 1.85 kPa-1 over a broad linear range up to 60 kPa and showed high stability over 10 000 cyclic pressings. The favorable sensing performance of the pressure sensor allows for accurate recognition of finger movements, acoustic vibrations, and real-time pulse waves. Moreover, a large-area pressure sensor array has been successfully assembled on one piece of flexible wood for spatial pressure mapping. The proposed strategy of directly using natural wood for high-performance flexible pressure sensors is simple, low-cost, sustainable, and scalable, opening up a new avenue for the development of next-generation wearable electronics and e-skins.
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Affiliation(s)
- Hao Guan
- Department of Wood Modification, Research Institute of Wood Industry, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
| | - Junwang Meng
- Department of Wood Modification, Research Institute of Wood Industry, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
| | - Zhiyong Cheng
- Department of Wood Modification, Research Institute of Wood Industry, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
| | - Xiaoqing Wang
- Research Institute of Forestry New Technology, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
- Department of Wood Modification, Research Institute of Wood Industry, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
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Stock JM, Chouramanis NV, Chirinos JA, Edwards DG. Dynamic and isometric handgrip exercise increases wave reflection in healthy young adults. J Appl Physiol (1985) 2020; 129:709-717. [PMID: 32853105 PMCID: PMC7654685 DOI: 10.1152/japplphysiol.00281.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 07/30/2020] [Accepted: 08/19/2020] [Indexed: 02/03/2023] Open
Abstract
Early return and increased magnitude of wave reflection augments pulsatile load, wastes left ventricular effort, and is associated with cardiovascular events. Acute handgrip (HG) exercise increases surrogate measures of wave reflection such as augmentation index. However, augmentation index does not allow distinguishing between timing versus magnitude of wave reflection and is affected by factors other than wave reflection per se. Wave separation analysis decomposes central pressure into relative contributions of forward (Pf) and backward (Pb) pressure wave amplitudes to calculate reflection magnitude (RM = Pb/Pf) and determine the timing of apparent wave reflection return. We tested the hypothesis that acute dynamic and isometric HG exercise increases RM and decreases reflected wave transit time (RWTT). Applanation tonometry was used to record radial artery pressure waveforms in 30 adults (25 ± 4 yr) at baseline and during dynamic and isometric HG exercise. Wave separation analysis was performed offline using a physiological flow wave to derive Pf, Pb, RM, and RWTT. We found that RM increased during dynamic and isometric HG exercise compared with baseline (P = 0.04 and P < 0.01, respectively; baseline 40 ± 5, dynamic 43 ± 6, isometric 43 ± 7%). Meanwhile, RWTT decreased during dynamic and isometric HG exercise compared with baseline (P = 0.03 and P < 0.001, respectively; baseline 164 ± 23, dynamic 155 ± 23, isometric 148 ± 20 ms). Moreover, the changes in RM and RWTT were not different between dynamic and isometric HG exercise. The present data suggest that wave reflection timing (RWTT) and magnitude (RM) are important factors that contribute to increased central blood pressure during HG exercise.NEW & NOTEWORTHY This study demonstrated that wave reflection magnitude is increased while reflected wave transit time is decreased during handgrip exercise in healthy young adults. The larger backward pressure waves and earlier return of these pressure waves were not different between dynamic and isometric handgrip exercise. These acute changes in wave reflection during handgrip exercise transiently augment pulsatile load.
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Affiliation(s)
- Joseph M Stock
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Nicholas V Chouramanis
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
| | - Julio A Chirinos
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - David G Edwards
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware
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Fu M, Zhang J, Jin Y, Zhao Y, Huang S, Guo CF. A Highly Sensitive, Reliable, and High-Temperature-Resistant Flexible Pressure Sensor Based on Ceramic Nanofibers. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2000258. [PMID: 32995117 PMCID: PMC7507114 DOI: 10.1002/advs.202000258] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 04/07/2020] [Indexed: 05/03/2023]
Abstract
Flexible pressure sensors are essential components for soft electronics by providing physiological monitoring capability for wearables and tactile perceptions for soft robotics. Flexible pressure sensors with reliable performance are highly desired yet challenging to construct to meet the requirements of practical applications in daily activities and even harsh environments, such as high temperatures. This work describes a highly sensitive and reliable capacitive pressure sensor based on flexible ceramic nanofibrous networks with high structural elasticity, which minimizes performance degradation commonly seen in polymer-based sensors because of the viscoelastic behavior of polymers. Such ceramic pressure sensors exhibit high sensitivity (≈4.4 kPa-1), ultralow limit of detection (<0.8 Pa), fast response speed (<16 ms) as well as low fatigue over 50 000 loading/unloading cycles. The high stability is attributed to the excellent mechanical stability of the ceramic nanofibrous network. By employing textile-based electrodes, a fully breathable and wearable ceramic pressure sensor is demonstrated for real-time health monitoring and motion detection. Owing to the high-temperature resistance of ceramics, the ceramic nanofibrous network sensor can function properly at temperatures up to 370 °C, showing great promise for harsh environment applications.
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Affiliation(s)
- Min Fu
- SUSTech Academy for Advanced Interdisciplinary StudiesDepartment of Materials Science and EngineeringDepartment of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
| | - Jianming Zhang
- SUSTech Academy for Advanced Interdisciplinary StudiesDepartment of Materials Science and EngineeringDepartment of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
| | - Yuming Jin
- Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
| | - Yue Zhao
- Department of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
| | - Siya Huang
- SUSTech Academy for Advanced Interdisciplinary StudiesDepartment of Materials Science and EngineeringDepartment of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
- Institute for Advanced StudyShenzhen UniversityGuangdong518060P. R. China
| | - Chuan Fei Guo
- Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhenGuangdong518055P. R. China
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O'Gallagher K, Shabeeh H, Munir S, Roomi A, Jiang B, Guilcher A, Brett S, Chowienczyk P. Effects of Inhibition of Nitric Oxide Synthase on Muscular Arteries During Exercise: Nitric Oxide Does Not Contribute to Vasodilation During Exercise or in Recovery. J Am Heart Assoc 2020; 9:e013849. [PMID: 32781940 PMCID: PMC7660814 DOI: 10.1161/jaha.119.013849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background Basal release of nitric oxide (NO) from the vascular endothelium regulates the tone of muscular arteries and resistance vasculature. Effects of NO on muscular arteries could be particularly important during exercise when shear stress may stimulate increased NO synthesis. Methods and Results We investigated acute effects of NO synthase inhibition on exercise hemodynamics using NG‐monomethyl‐l‐arginine (l‐NMMA), a nonselective NO synthase ‐inhibitor. Healthy volunteers (n=10, 5 female, 19–33 years) participated in a 2‐phase randomized crossover study, receiving l‐NMMA (6 mg/kg, iv over 5 minutes) or placebo before bicycle exercise (25–150 W for 12 minutes). Blood pressure, cardiac output (measured by dilution of soluble and inert tracers) and femoral artery diameter were measured before, during, and after exercise. At rest, l‐NMMA reduced heart rate (by 16.2±4.3 bpm relative to placebo, P<0.01), increased peripheral vascular resistance (by 7.0±1.4 mmHg per L/min, P<0.001), mean arterial blood pressure (by 8.9±3.5 mmHg, P<0.05), and blunted an increase in femoral artery diameter that occurred immediately before exercise (change in diameter: 0.14±0.04 versus 0.32±0.06 mm after l‐NMMA and placebo, P<0.01). During/after exercise l‐NMMA had no significant effect on peripheral resistance, cardiac output, or on femoral artery diameter. Conclusions These results suggest that NO plays little role in modulating muscular artery function during exercise but that it may mediate changes in muscular artery tone immediately before exercise.
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Affiliation(s)
- Kevin O'Gallagher
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Husain Shabeeh
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Shahzad Munir
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Ali Roomi
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Benyu Jiang
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Antoine Guilcher
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Sally Brett
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
| | - Philip Chowienczyk
- Cardiovascular Division Department of Clinical Pharmacology King's College London School of Medicine St Thomas' Hospital London United Kingdom
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Okamoto T, Hashimoto Y, Kobayashi R. Isometric handgrip training reduces blood pressure and wave reflections in East Asian, non-medicated, middle-aged and older adults: a randomized control trial. Aging Clin Exp Res 2020; 32:1485-1491. [PMID: 31463925 DOI: 10.1007/s40520-019-01330-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 08/17/2019] [Indexed: 10/26/2022]
Abstract
PURPOSE The aim of this study was to investigate the effects of isometric handgrip (IHG) training on central and peripheral blood pressure (BP) and wave reflections in East Asian non-medicated middle-aged and older adults. METHODS Twenty-two men and women (mean age 65 ± 11 years) who were not actively involved in regular resistance or endurance training were randomly assigned to a group that did IHG and a control (CON) group. The IHG training was comprised of four unilateral 2-min isometric contractions at 30% of maximal voluntary contraction using a programmed handgrip dynamometer with 1-min rest periods for 5 days per week for 8 weeks. RESULTS Baseline central systolic BP (cSBP), brachial systolic BP (bSBP), brachial diastolic BP (bDBP), and the augmentation index (AIx) (via an automated applanation tonometric system) did not differ significantly between the groups. Compared to baseline, cSBP, bSBP, bDBP, and AIx decreased significantly after the 8-week study period in the IHG group (P < 0.05). No significant changes in central and peripheral BP and AIx were observed in the CON group. CONCLUSIONS These results suggest that IHG training could reduce central and peripheral BP and wave reflections in East Asian non-medicated middle-aged and older adults.
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Mert KU, Şener E, Yılmaz AS, Mert GÖ, Yetmiş F, Dural M, Babayigit E, Murat S, Cavusoglu Y, Ulus T, Görenek B. The association of exaggerated hypertensive response to exercise and beta-blockers use in hypertensives. Clin Exp Hypertens 2020; 42:707-713. [DOI: 10.1080/10641963.2020.1779284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Kadir Uğur Mert
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Emre Şener
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Ahmet Serdar Yılmaz
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Gurbet Özge Mert
- Department of Cardiology, Eskisehir Yunus Emre, State Hospital, Eskişehir, Turkey
| | - Furkan Yetmiş
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Muhammet Dural
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Erdi Babayigit
- Department of Cardiology, Kulu State Hospital, Konya, Turkey
| | - Selda Murat
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Yuksel Cavusoglu
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Taner Ulus
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Bülent Görenek
- Faculty of Medicine, Department of Cardiology, Eskişehir Osmangazi University, Eskişehir, Turkey
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Hu J, Yu J, Li Y, Liao X, Yan X, Li L. Nano Carbon Black-Based High Performance Wearable Pressure Sensors. NANOMATERIALS 2020; 10:nano10040664. [PMID: 32252336 PMCID: PMC7221763 DOI: 10.3390/nano10040664] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/26/2020] [Accepted: 03/28/2020] [Indexed: 01/11/2023]
Abstract
The reasonable design pattern of flexible pressure sensors with excellent performance and prominent features including high sensitivity and a relatively wide workable linear range has attracted significant attention owing to their potential application in the advanced wearable electronics and artificial intelligence fields. Herein, nano carbon black from kerosene soot, an atmospheric pollutant generated during the insufficient burning of hydrocarbon fuels, was utilized as the conductive material with a bottom interdigitated textile electrode screen printed using silver paste to construct a piezoresistive pressure sensor with prominent performance. Owing to the distinct loose porous structure, the lumpy surface roughness of the fabric electrodes, and the softness of polydimethylsiloxane, the piezoresistive pressure sensor exhibited superior detection performance, including high sensitivity (31.63 kPa−1 within the range of 0–2 kPa), a relatively large feasible range (0–15 kPa), a low detection limit (2.26 pa), and a rapid response time (15 ms). Thus, these sensors act as outstanding candidates for detecting the human physiological signal and large-scale limb movement, showing their broad range of application prospects in the advanced wearable electronics field.
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Affiliation(s)
- Junsong Hu
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Jianshe North Road, Chengdu 610054, China; (J.H.); (J.Y.)
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Honghe Avenue, Chongqing 402160, China; (X.L.); (X.Y.)
| | - Junsheng Yu
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Jianshe North Road, Chengdu 610054, China; (J.H.); (J.Y.)
| | - Ying Li
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Honghe Avenue, Chongqing 402160, China; (X.L.); (X.Y.)
- Correspondence: (Y.L.); (L.L.)
| | - Xiaoqing Liao
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Honghe Avenue, Chongqing 402160, China; (X.L.); (X.Y.)
| | - Xingwu Yan
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Honghe Avenue, Chongqing 402160, China; (X.L.); (X.Y.)
| | - Lu Li
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Honghe Avenue, Chongqing 402160, China; (X.L.); (X.Y.)
- Correspondence: (Y.L.); (L.L.)
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Li K, Zhang S, Chi Z, Yang Y, Jiang H, Yang L, Wang A, Zhang L, Chen F, Zheng D. Arterial Pulse Waveform Characteristics Difference between the Three Trimesters of Healthy Pregnant Women. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2019; 2018:5317-5320. [PMID: 30441537 DOI: 10.1109/embc.2018.8513492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
During pregnancy, the pregnant mother undergoes significant physiological changes in order to accommodate the developing fetus. In recent years, arterial pulse wave has been widely used to reflect these physiological changes. The aim of this study was to investigate the changes of radial pulse and photoplethysmography (PPG) pulse waveform characteristic with gestational age in normal pregnant women. 40 pregnant women volunteers were recruited from February 2016 to September 2016 from the Haidian Maternal & Child Health Hospital in Beijing. Both radial pulses and PPG pulses were recorded simultaneously using a PowerLab data collection system at a sampling rate of 1000Hz for offline analysis. Their pulses were measured from each pregnant woman at three trimesters (first trimester between week 11-13; second trimester between week 20-22 and the third trimester between week 3739). Three waveform characteristics (total pulse area; pulse area1: the area before the notch position; pulse area2: the area after the notch position) were derived. The results showed that the total pulse area and pulse area2 from both radial and PPG pulses decreased significantly between two paired consecutive trimesters (all P<0.01, except the comparisons between the second and third trimesters for PPG pulses). In summary, this study has quantified the pulse waveform characteristic differences in terms of pulse areas between the three trimesters, providing useful scientific evidence to better understand the cardiovascular physiological changes during normal pregnancy.
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Guo J, Zhou B, Zong R, Pan L, Li X, Yu X, Yang C, Kong L, Dai Q. Stretchable and Highly Sensitive Optical Strain Sensors for Human-Activity Monitoring and Healthcare. ACS APPLIED MATERIALS & INTERFACES 2019; 11:33589-33598. [PMID: 31464425 DOI: 10.1021/acsami.9b09815] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Flexible and stretchable strain sensors are essential to developing smart wearable devices for monitoring human activities. Such sensors have been extensively exploited with various conductive materials and structures, which, however, are normally in need of complex manufacturing processes and confronted with the challenge to achieve both large stretchability and high sensitivity. Here, we report a simple and low-cost optical strategy for the design of stretchable strain sensors which are capable of measuring large strains of 100% with a low detection limit (±0.09%), a fast responsivity (<12 ms), and high reproducibility (over 6000 cycles). The optical strain sensor (OS2) is fabricated by assembling plasmonic gold nanoparticles (GNPs) in stretchable elastomer-based optical fibers, where a core/cladding structure with step-index configuration is adopted for light confinement. The stretchable, GNP-incorporated optical fiber shows strong localized surface plasmon resonance effects that enable sensitive and reversible detection of strain deformations with high linearity and negligible hysteresis. The unique mechanical and sensing properties of the OS2 enable its assembling into clothing or mounting on skin surfaces for monitoring various human activities from physiological signals as subtle as wrist pulses to large motions of joint bending and hand gestures. We further apply the OS2 for quantitative analysis of motor disorders such as Parkinson's disease and demonstrate its compatibility in strong electromagnetic interference environments during functional magnetic resonance imaging, showing great promises for diagnostics and assessments of motor neuron diseases in clinics.
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Affiliation(s)
- Jingjing Guo
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments , Tsinghua University , Beijing 100084 , China
| | - Bingqian Zhou
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments , Tsinghua University , Beijing 100084 , China
| | | | | | | | | | - Changxi Yang
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments , Tsinghua University , Beijing 100084 , China
| | - Lingjie Kong
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments , Tsinghua University , Beijing 100084 , China
| | - Qionghai Dai
- Department of Automation , Tsinghua University , Beijing 100084 , China
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Perdomo SJ, Balzer JR, Jakicic JM, Kline CE, Gibbs BB. Acute effects of aerobic exercise duration on blood pressure, pulse wave velocity and cerebral blood flow velocity in middle-aged adults. SPORT SCIENCES FOR HEALTH 2019. [DOI: 10.1007/s11332-019-00566-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Associations of Cardiorespiratory Fitness and Adiposity With Arterial Stiffness and Arterial Dilatation Capacity in Response to a Bout of Exercise in Children. Pediatr Exerc Sci 2019; 31:238-247. [PMID: 30626267 DOI: 10.1123/pes.2018-0145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Purpose: To investigate the associations of directly measured peak oxygen uptake ( V˙O2peak ) and body fat percentage (BF%) with arterial stiffness and arterial dilatation capacity in children. Methods: Findings are based on 329 children (177 boys and 152 girls) aged 8-11 years. V˙O2peak was assessed by a maximal cardiopulmonary exercise test on a cycle ergometer and scaled by lean body mass (LM). BF% and LM were measured by bioelectrical impedance. Stiffness index (measure of arterial stiffness) and change in reflection index (ΔRI, measure of arterial dilatation capacity) were assessed by pulse contour analysis. Data were analyzed by linear regression models. Results:V˙O2peak/LM was positively associated with ΔRI in boys adjusted for age and BF% (β = 0.169, P = .03). Further adjustments for systolic blood pressure, heart rate, and the study group had no effect on this association, but additional adjustment for clinical puberty attenuated it (β = 0.171, P = .07). BF% was inversely related to ΔRI in boys adjusted for age and V˙O2peak/LM (β = -0.171, P = .03). V˙O2peak or BF% was not associated with ΔRI in girls or with stiffness index in either boys or girls. Conclusion: Increasing cardiorespiratory fitness and decreasing adiposity may improve arterial health in childhood, especially among boys.
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Fu Y, Zhao S, Zhu R. A Wearable Multifunctional Pulse Monitor Using Thermosensation-Based Flexible Sensors. IEEE Trans Biomed Eng 2019; 66:1412-1421. [DOI: 10.1109/tbme.2018.2873754] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Tsai YN, Chang YH, Huang YC, Jui-Shan Lin S, Lee SM, Cheng YY, Su YC. The use of time-domain analysis on the choice of measurement location for pulse diagnosis research: A pilot study. J Chin Med Assoc 2019; 82:78-85. [PMID: 30839409 DOI: 10.1016/j.jcma.2018.07.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
BACKGROUND Pulse diagnosis researches acquiring pulse waves from the wrist radial artery has not yet addressed the issue of whether this information is affected by differences in the hemodynamic characteristics of pressure waves derived from different locations. This study aimed to clarify whether the blood dynamic states are identical with regard to the "three positions and nine indicators" ((Equation is included in full-text article.)) listed in traditional Chinese medicine (TCM). METHODS A total of 37 participants of CAD group and 20 participants of healthy group were recruited, and pressure pulse waves were measured at 18 locations on both hands. A multivariate analysis (MANOVA) was performed with a "randomized block design" using SPSS 22.0 and R 3.4.1 to examine the time-domain parameters that represented certain hemodynamic characteristics. RESULTS In CAD group, the results showed significant differences (p < 0.05) among the h1, h2, h3, h1/t, and h3/h1 measurements of the pulse waves using different indicators at the same position; the h1, h2, h3, and h1/t measurements of the pulse waves at different positions using the indicator "Superficial"; and the h1, h2, h3, h1/t, and h3/h1 measurements of the pulse waves at different positions using the indicator "Medium". In healthy group, the results showed significant differences (p < 0.05) among the h1, h2, h3, and h1/t measurements of the pulse waves using different indicators at the same position; the h1, h2, and h1/t measurements of the pulse waves at different positions using the same indicator. CONCLUSION Because of the differences in the hemodynamic characteristics among the different positions and indicators, the article might provide a new opinion for future pulse diagnosis investigations to carefully consider the measurement location to ensure the completeness of the information.
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Affiliation(s)
- Yun-Ning Tsai
- Graduate Institute of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan, ROC
- Chander Clinic, Taipei, Taiwan, ROC
- Department of Chinese Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | | | - Yi-Chia Huang
- Graduate Institute of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan, ROC
- Department of Chinese Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Sunny Jui-Shan Lin
- Department of Chinese Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei, Taiwan, ROC
| | - Shen-Ming Lee
- Department of Statistics, Feng-Chia University, Taichung, Taiwan, ROC
- Center for Survey Research, Research Center for Humanities and Social Sciences, Academia Sinica, Taipei, Taiwan, ROC
| | - Yung-Yen Cheng
- The Department of Internal Medicine, Nantou Hospital of the Ministry of Health and Welfare, Nantou, Taiwan, ROC
| | - Yi-Chang Su
- Graduate Institute of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan, ROC
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei, Taiwan, ROC
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan, ROC
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38
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Abstract
The rate at which an individual recovers from exercise is known to be indicative of cardiovascular risk. It has been widely shown that the reduction in heart rate immediately after exercise is predictive of mortality. However, little research has been conducted into whether the time taken for the blood vessels to return to normal is also indicative of risk. In this study, we present a novel approach to assess vascular recovery rate (VRR) using the photoplethysmogram (PPG) signal, which is monitored by smart wearables. The VORTAL dataset (http://peterhcharlton.github.io/RRest/) was used for this study, containing PPG signals from 39 healthy subjects before (baseline) and after exercise. 31 VRR indices were extracted from the PPG pulse wave shape, as well as heart rate for comparison. The rate at which indices returned to baseline after exercise was quantified, and the consistency of changes between subjects was assessed statistically. Many VRR indices exhibited changes after exercise which were consistent between subjects. Indices derived from the timings and second derivative of pulse waves were identified as candidates for future work. The rate at which the indices returned to baseline differed between indices and subjects, indicating that they may provide additional information beyond that of heart rate, and that they may be useful for stratifying subjects. This study demonstrated the feasibility of assessing VRR after exercise from the PPG. Future studies should investigate whether VRR indices are associated with cardiovascular fitness, and the potential utility of incorporating the indices into wearable sensors.
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Affiliation(s)
- Halil Dijab
- Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, King’s College London, King’s Health Partners, St Thomas’ Hospital, London SE1 7EH, UK
| | - Jordi Alastruey
- Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, King’s College London, King’s Health Partners, St Thomas’ Hospital, London SE1 7EH, UK
| | - Peter H. Charlton
- Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, King’s College London, King’s Health Partners, St Thomas’ Hospital, London SE1 7EH, UK
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Pierce DR, Doma K, Raiff H, Golledge J, Leicht AS. Influence of Exercise Mode on Post-exercise Arterial Stiffness and Pressure Wave Measures in Healthy Adult Males. Front Physiol 2018; 9:1468. [PMID: 30459633 PMCID: PMC6232940 DOI: 10.3389/fphys.2018.01468] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 09/28/2018] [Indexed: 12/14/2022] Open
Abstract
Background: Exercise mode has been reported to be an important determinant of arterial stiffness and wave reflection changes following a brief bout of exercise with inconsistent results to date. This study examined the impact of exercise mode on arterial stiffness and pressure wave measures following acute aerobic exercise (AER), resistance exercise (RES), and a control (CON) condition with no exercise. Methods: In a randomized, cross-over, repeated measures design, 21 healthy adult males (26.7 ± 7.2 years) undertook three experimental intervention sessions: AER (30-min cycle ergometry at 70-75% maximum heart rate), RES (3 × 10 repetitions of six upper and lower body exercises at 80-90% of 10-repetition maximum) and CON (30-min seated rest). Measures of arterial stiffness and pressure waves, such as carotid-femoral pulse wave velocity (cf-PWV), augmentation index (AIx), AIx corrected for heart rate of 75 (AIx75), and forward wave (Pf), backward wave (Pb) and reflection magnitude, were assessed at Rest and at 10-min intervals for 60 min after the intervention sessions. Comparisons between interventions and over time were assessed via repeated measures ANOVA and post-hoc Tukey's tests. Results: No significant differences in cf-PWV were noted between the three interventions at rest or post-intervention. However, RES led to significantly greater post-intervention AIx, AIx75, Pf, and Pb compared to AER and CON with AIx75 also remaining significantly elevated throughout the post-intervention period. In contrast, AER resulted in a brief, significant elevation of AIx75 and no change in cf-PWV, Pf, Pb, and reflection magnitude. Conclusions: Exercise mode, specifically RES and AER, significantly influenced the time course of pressure wave reflection responses following a brief bout of exercise in healthy adult males. Distinct adjustments during exercise including changes in blood pressure and vasomotor tone may be key modulators of post-exercise arterial function. Identification of modal differences may assist in understanding the impact of exercise on cardiovascular function and the mechanisms by which exercise benefits vascular health.
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Affiliation(s)
- Doris R Pierce
- Sport & Exercise Science, James Cook University, Cairns, QLD, Australia
| | - Kenji Doma
- Sport & Exercise Science, James Cook University, Townsville, QLD, Australia
| | - Hayleigh Raiff
- Department of Health and Sport Science, University of Dayton, Dayton, OH, United States
| | - Jonathan Golledge
- Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, QLD, Australia.,Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, QLD, Australia
| | - Anthony S Leicht
- Sport & Exercise Science, James Cook University, Townsville, QLD, Australia
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40
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Chen S, Song Y, Xu F. Flexible and Highly Sensitive Resistive Pressure Sensor Based on Carbonized Crepe Paper with Corrugated Structure. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34646-34654. [PMID: 30226754 DOI: 10.1021/acsami.8b13535] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Recently, cellulose paper based materials have emerged for applications in wearable "green" electronics due to their earth abundance, low cost, light weight, flexibility, and sustainability. Herein, for the first time, we develop an almost all cellulose paper based pressure sensor through a facile, cost-effective, scalable, and environment-friendly approach. The screen-printed interdigital electrodes on the flat printing paper and the carbonized crepe paper (CCP) with good conductivity are integrated into a flexible pressure sensor as substrates and active materials, respectively. The porous and corrugated structure of the CCP endows the pressure sensor with high sensitivity (2.56-5.67 kPa-1 in the range of 0-2.53 kPa), wide workable pressure range (0-20 kPa), fast response time (<30 ms), low detection limit (∼0.9 Pa), and good durability (>3000 cycles). Additionally, we demonstrate the practical applications of the CCP pressure sensor in detection of finger touching, wrist pulse, respiration, phonation, acoustic vibration, etc., and real-time monitoring of spatial pressure distribution. The proposed CCP pressure sensor has great potentials in various applications as wearable electronics. Moreover, the subtle fabrication of the desired materials based on commercially available products provides new insights into the development of green electronics.
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Affiliation(s)
- Sheng Chen
- Beijing Key Laboratory of Lignocellulosic Chemistry , Beijing Forestry University , Beijing 100083 , China
| | - Yijia Song
- Beijing Key Laboratory of Lignocellulosic Chemistry , Beijing Forestry University , Beijing 100083 , China
| | - Feng Xu
- Beijing Key Laboratory of Lignocellulosic Chemistry , Beijing Forestry University , Beijing 100083 , China
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41
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Tai YL, Marshall EM, Glasgow A, Parks JC, Sensibello L, Kingsley JD. Pulse wave reflection responses to bench press with and without practical blood flow restriction. Appl Physiol Nutr Metab 2018; 44:341-347. [PMID: 30205017 DOI: 10.1139/apnm-2018-0265] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Resistance exercise is recommended to increase muscular strength but may also increase pulse wave reflection. The effect of resistance exercise combined with practical blood flow restriction (pBFR) on pulse wave reflection is unknown. The purpose of this study was to evaluate the differences in pulse wave reflection characteristics between bench press with pBFR and traditional high-load bench press in resistance-trained men. Sixteen resistance-trained men participated in the study. Pulse wave reflection characteristics were assessed before and after low-load bench press with pBFR (LL-pBFR), traditional high-load bench press (HL), and a control (CON). A repeated-measures ANOVA was used to evaluate differences in pulse wave reflection characteristics among the conditions across time. There were significant (p ≤ 0.05) interactions for heart rate, augmentation index, augmentation index normalized at 75 bpm, augmentation pressure, time-tension index, and wasted left ventricular energy such that they were increased after LL-pBFR and HL compared with rest and CON, with no differences between LL-pBFR and HL. Aortic pulse pressure (p < 0.001) was elevated only after LL-pBFR compared with rest. In addition, there was a significant (p ≤ 0.05) interaction for aortic diastolic blood pressure (BP) such that it was decreased after LL-pBFR compared with rest and CON but not HL. The subendocardial viability ratio and diastolic pressure-time index were significantly different between LL-pBFR and HL compared with rest and CON. There were no significant interactions for brachial systolic or diastolic BP, aortic systolic BP, or time of the reflected wave. In conclusion, acute bench press resistance exercise significantly altered pulse wave reflection characteristics without differences between LL-pBFR and HL.
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Affiliation(s)
- Yu Lun Tai
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
| | - Erica M Marshall
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
| | - Alaina Glasgow
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
| | - Jason C Parks
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
| | - Leslie Sensibello
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
| | - J Derek Kingsley
- Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA.,Cardiovascular Dynamics Laboratory, Exercise Physiology, 161F MACC Annex, Kent State University, Kent, OH 44242, USA
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42
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Pugh CJA, Stone KJ, Stöhr EJ, McDonnell BJ, Thompson JES, Talbot JS, Wakeham DJ, Cockcroft JR, Shave R. Carotid artery wall mechanics in young males with high cardiorespiratory fitness. Exp Physiol 2018; 103:1277-1286. [DOI: 10.1113/ep087067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/28/2018] [Indexed: 01/10/2023]
Affiliation(s)
| | - Keeron J. Stone
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
- School of Sport & Exercise; University of Gloucester; Gloucester UK
| | - Eric J. Stöhr
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
- Columbia University Irving Medical Center; Columbia University in the City of New York; New York NY USA
| | - Barry J. McDonnell
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
| | - Jane E. S. Thompson
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
| | - Jack S. Talbot
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
| | - Denis J. Wakeham
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
| | - John R. Cockcroft
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
| | - Robert Shave
- Cardiff School of Sport & Health Science; Cardiff Metropolitan University; Cardiff UK
- Centre for Heart, Lung & Vascular Health; University of British Columbia; Kelowna BC Canada
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43
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Acute effects of lower and upper body-resistance training on arterial stiffness, peripheral, and central blood pressure in young normotensive women. SPORT SCIENCES FOR HEALTH 2018. [DOI: 10.1007/s11332-018-0440-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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44
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Compton RO, Figueroa A, Gonzales JU. Postexercise hypotension in central aortic pressures following walking and its relation to cardiorespiratory fitness. J Sports Med Phys Fitness 2018; 59:717-722. [PMID: 29991215 DOI: 10.23736/s0022-4707.18.08615-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Central aortic blood pressure (BP) is reduced after exercise. The aim of this study was to determine whether cardiorespiratory fitness relates to postexercise reductions in aortic BP. METHODS Sixteen young adults completed maximal exercise testing for peak oxygen uptake (VO2). Participants walked at a slow (80 steps/min, ~47% maxHR) and fast (125 steps/min, ~65% maxHR) stepping cadence for 3000 steps on two nonconsecutive days. Before and after each walking condition, radial tonometry was used to derive aortic pressures. Measurements after walking were taken after 30 and 60 min of supine recovery. RESULTS The change in aortic BP was similar between walking cadences. Aortic systolic BP (-2.3 mmHg, P=0.03) and pulse pressure (-3.2 mmHg, P<0.001) were significantly reduced after 60 min of recovery as compared to baseline. The reduction in aortic pulse pressure was associated with decreased forward (r=0.69, P<0.001) and backward wave pressure (r=0.70, P<0.001). Peak VO2 was not associated (P>0.05) with these changes, but was strongly associated with non-significant changes in aortic systolic BP (30min: r=-0.54, P=0.03) and diastolic BP (30 min: r=-0.64, 60 min: r=-0.77; both P<0.01) after slow walking only. CONCLUSIONS These results indicate that cardiorespiratory fitness associates with aortic pressure reductions after walking dependent on exercise intensity.
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Affiliation(s)
- Robert O Compton
- Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, TX, USA
| | - Arturo Figueroa
- Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, TX, USA
| | - Joaquin U Gonzales
- Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, TX, USA -
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45
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Perissiou M, Bailey TG, Windsor M, Nam MCY, Greaves K, Leicht AS, Golledge J, Askew CD. Effects of exercise intensity and cardiorespiratory fitness on the acute response of arterial stiffness to exercise in older adults. Eur J Appl Physiol 2018; 118:1673-1688. [PMID: 29850932 DOI: 10.1007/s00421-018-3900-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 05/23/2018] [Indexed: 01/09/2023]
Abstract
PURPOSE Increased arterial stiffness is observed with ageing and in individuals with low cardiorespiratory fitness ([Formula: see text]O2peak), and associated with cardiovascular risk. Following an exercise bout, transient arterial stiffness reductions offer short-term benefit, but may depend on exercise intensity. This study assessed the effects of exercise intensity on post-exercise arterial stiffness in older adults with varying fitness levels. METHODS Fifty-one older adults (72 ± 5 years) were stratified into fitness tertiles ([Formula: see text]O2peak: low-, 22.3 ± 3.1; mid-, 27.5 ± 2.4 and high-fit 36.3 ± 6.5 mL kg-1 min-1). In a randomised order, participants underwent control (no-exercise), moderate-intensity continuous exercise (40% of peak power output; PPO), and higher-intensity interval exercise (70% of PPO) protocols. Pulse wave velocity (PWV), augmentation index (AIx75) and reflection magnitude (RM) were assessed at rest and during 90 min of recovery following each protocol. RESULTS After control, delta PWV increased over time (P < 0.001) and delta RM was unchanged. After higher-intensity interval exercise, delta PWV (P < 0.001) and delta RM (P < 0.001) were lower to control in all fitness groups. After moderate-intensity continuous exercise, delta PWV was not different from control in low-fit adults (P = 0.057), but was lower in the mid- and higher-fit older adults. Post-exercise AIx75 was higher to control in all fitness groups (P = 0.001). CONCLUSIONS In older adults, PWV increases during seated rest and this response is attenuated after higher-intensity interval exercise, regardless of fitness level. This attenuation was also observed after moderate-intensity continuous exercise in adults with higher, but not lower fitness levels. Submaximal exercise reveals differences in the arterial stiffness responses between older adults with higher and lower cardiorespiratory fitness.
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Affiliation(s)
- Maria Perissiou
- VasoActive Research Group, School of Health and Sport Sciences, University of the Sunshine Coast, Locked bag 4, Maroochydore DC, Sunshine Coast, QLD, Australia
| | - Tom G Bailey
- VasoActive Research Group, School of Health and Sport Sciences, University of the Sunshine Coast, Locked bag 4, Maroochydore DC, Sunshine Coast, QLD, Australia.,Centre for Research on Exercise, Physical Activity and Health, School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Mark Windsor
- VasoActive Research Group, School of Health and Sport Sciences, University of the Sunshine Coast, Locked bag 4, Maroochydore DC, Sunshine Coast, QLD, Australia
| | - Michael Chi Yuan Nam
- Sunshine Coast University Hospital, Sunshine Coast Hospital and Health Service, Birtinya, Sunshine Coast, Australia
| | - Kim Greaves
- VasoActive Research Group, School of Health and Sport Sciences, University of the Sunshine Coast, Locked bag 4, Maroochydore DC, Sunshine Coast, QLD, Australia.,Sunshine Coast University Hospital, Sunshine Coast Hospital and Health Service, Birtinya, Sunshine Coast, Australia
| | - Anthony S Leicht
- Sport and Exercise Science, James Cook University, Townsville, QLD, Australia
| | - Jonathan Golledge
- Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, QLD, Australia.,Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, QLD, Australia
| | - Christopher D Askew
- VasoActive Research Group, School of Health and Sport Sciences, University of the Sunshine Coast, Locked bag 4, Maroochydore DC, Sunshine Coast, QLD, Australia.
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46
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Feng H, Zhao C, Tan P, Liu R, Chen X, Li Z. Nanogenerator for Biomedical Applications. Adv Healthc Mater 2018; 7:e1701298. [PMID: 29388350 DOI: 10.1002/adhm.201701298] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/09/2017] [Indexed: 01/25/2023]
Abstract
In the past 10 years, the development of nanogenerators (NG) has enabled different systems to operate without external power supply. NG have the ability to harvest the mechanical energies in different forms. Human body motions and activities can also serve as the energy source to drive NG and enable self-powered healthcare system. In this review, a summary of several major actual applications of NG in the biomedical fields is made including the circulatory system, the neural system, cell modulation, microbe disinfection, and biodegradable electronics. Nevertheless, there are still many challenges for NG to be actually adopted in clinical applications, including the miniaturization, duration, encapsulation, and output performance. It is also very important to further combine the NG development more precisely with the medical principles. In future, NG can serve as highly promising complementary or even alternative power suppliers to traditional batteries for the healthcare electronics.
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Affiliation(s)
- Hongqing Feng
- Beijing Institute of Nanoenergy and Nanosystems; Chinese Academy of Sciences; Beijing 100083 P. R. China
- School of Nanoscience and Technology; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Chaochao Zhao
- Beijing Institute of Nanoenergy and Nanosystems; Chinese Academy of Sciences; Beijing 100083 P. R. China
- School of Nanoscience and Technology; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Puchuan Tan
- Beijing Institute of Nanoenergy and Nanosystems; Chinese Academy of Sciences; Beijing 100083 P. R. China
- School of Nanoscience and Technology; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Ruping Liu
- Beijing Institute of Graphic Communication; Beijing 102600 P. R. China
| | - Xin Chen
- Beijing Institute of Graphic Communication; Beijing 102600 P. R. China
| | - Zhou Li
- Beijing Institute of Nanoenergy and Nanosystems; Chinese Academy of Sciences; Beijing 100083 P. R. China
- School of Nanoscience and Technology; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
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47
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Pierce DR, Doma K, Leicht AS. Acute Effects of Exercise Mode on Arterial Stiffness and Wave Reflection in Healthy Young Adults: A Systematic Review and Meta-Analysis. Front Physiol 2018; 9:73. [PMID: 29487535 PMCID: PMC5816907 DOI: 10.3389/fphys.2018.00073] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/22/2018] [Indexed: 01/17/2023] Open
Abstract
Background: This systematic review and meta-analysis quantified the effect of acute exercise mode on arterial stiffness and wave reflection measures including carotid-femoral pulse wave velocity (cf-PWV), augmentation index (AIx), and heart rate corrected AIx (AIx75). Methods: Using standardized terms, database searches from inception until 2017 identified 45 studies. Eligible studies included acute aerobic and/or resistance exercise in healthy adults, pre- and post-intervention measurements or change values, and described their study design. Data from included studies were analyzed and reported in accordance with the Cochrane Handbook for Systematic Reviews of Interventions and PRISMA guidelines. Meta-analytical data were reported via forest plots using absolute differences with 95% confidence intervals with the random effects model accounting for between-study heterogeneity. Reporting bias was assessed via funnel plots and, individual studies were evaluated for bias using the Cochrane Collaboration's tool for assessing risk of bias. A modified PEDro Scale was applied to appraise methodological concerns inherent to included studies. Results: Acute aerobic exercise failed to change cf-PWV (mean difference: 0.00 ms-1 [95% confidence interval: -0.11, 0.11], p = 0.96), significantly reduced AIx (-4.54% [-7.05, -2.04], p = 0.0004) and significantly increased AIx75 (3.58% [0.56, 6.61], p = 0.02). Contrastingly, acute resistance exercise significantly increased cf-PWV (0.42 ms-1 [0.17, 0.66], p = 0.0008), did not change AIx (1.63% [-3.83, 7.09], p = 0.56), and significantly increased AIx75 (15.02% [8.71, 21.33], p < 0.00001). Significant heterogeneity was evident within all comparisons except cf-PWV following resistance exercise, and several methodological concerns including low applicability of exercise protocols and lack of control intervention were identified. Conclusions: Distinct arterial stiffness and wave reflection responses were identified following acute exercise with overall increases in both cf-PWV and AIx75 following resistance exercise potentially arising fromcardiovascular and non-cardiovascular factors that likely differ from those following aerobic exercise. Future studies should address identified methodological limitations to enhance interpretation and applicability of arterial stiffness and wave reflection indices to exercise and health.
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Affiliation(s)
- Doris R Pierce
- Sport and Exercise Science, James Cook University, Cairns, QLD, Australia
| | - Kenji Doma
- Sport and Exercise Science, James Cook University, Townsville, QLD, Australia
| | - Anthony S Leicht
- Sport and Exercise Science, James Cook University, Townsville, QLD, Australia
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48
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Alian AA. Anesthesiologist as Physiologist: Discussion and Examples of Clinical Waveform Analysis. Anesth Analg 2018; 124:154-166. [PMID: 27611809 DOI: 10.1213/ane.0000000000001468] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Aymen A Alian
- From the Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut
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49
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Hanssen H, Minghetti A, Magon S, Rossmeissl A, Papadopoulou A, Klenk C, Schmidt-Trucksäss A, Faude O, Zahner L, Sprenger T, Donath L. Superior Effects of High-Intensity Interval Training vs. Moderate Continuous Training on Arterial Stiffness in Episodic Migraine: A Randomized Controlled Trial. Front Physiol 2017; 8:1086. [PMID: 29311997 PMCID: PMC5742195 DOI: 10.3389/fphys.2017.01086] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 12/11/2017] [Indexed: 01/03/2023] Open
Abstract
Background: Migraine is associated with increased cardiovascular risk and vascular dysfunction. Since aerobic exercise can reduce cardiovascular risk, the present randomized controlled trail aimed at investigating the effects of high-intensity interval training (HIT) vs. moderate continuous exercise training (MCT) on arterial stiffness in migraine patients. Methods: Forty-eight episodic migraineurs were initially enrolled in the study. 37 patients [female: 30; age: 37 (SD: 10); BMI: 23.1 (5.2); Migraine days per month: 3.7 (2.5)] completed the intervention. Central blood pressure, pulse wave reflection, and aortic pulse wave velocity (PWV) were obtained by an oscillometric monitor. Incremental treadmill exercise testing yielded maximal and submaximal fitness parameters. Participants were randomly assigned to either HIT, MCT, or a control group (CON). The intervention groups trained twice a week over a 12-week intervention period. Results: After adjustment for between-group baseline differences, a moderate meaningful overall reduction of the augmentation index at 75 min−1 heart rate (AIx@75) was observed [partial eta squared (ηp2) = 0.16; p = 0.06]. With 91% likely beneficial effects, HIT was more effective in reducing AIx@75 than MCT [HIT: pre 22.0 (9.7), post 14.9 (13.0), standardized mean difference (SMD) = 0.62; MCT: pre 16.6 (8.5), post 21.3 (10.4), SMD −0.49]. HIT induced a relevant reduction in central systolic blood pressure [cSBP: pre 118 (23) mmHg, post 110 (16) mmHg, SMD = 0.42] with a 59% possibly beneficial effect compared to CON, while MCT showed larger effects in lowering central diastolic blood pressure [pre 78 (7) mmHg, post 74 (7) mmHg, SMD = 0.61], presenting 60% possibly beneficial effects compared to CON. Central aortic PWV showed no changes in any of the three groups. Migraine days were reduced more successfully by HIT than MCT (HIT: SMD = 1.05; MCT: SMD = 0.43). Conclusion: HIT but not MCT reduces AIx@75 as a measure of pulse wave reflection and indirect marker of systemic arterial stiffness. Both exercise modalities beneficially affect central blood pressure. HIT proved to be an effective complementary treatment option to reduce vascular dysfunction and blood pressure in migraineurs.
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Affiliation(s)
- Henner Hanssen
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Alice Minghetti
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Stefano Magon
- Department of Neurology, University Hospital Basel and University of Basel, Basel, Switzerland.,Medical Image Analysis Center, University Hospital Basel, Basel, Switzerland
| | - Anja Rossmeissl
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Athina Papadopoulou
- Department of Neurology, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Christopher Klenk
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | | | - Oliver Faude
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Lukas Zahner
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - Till Sprenger
- Department of Neurology, University Hospital Basel and University of Basel, Basel, Switzerland.,Department of Neurology, DKD HELIOS Klinik Wiesbaden, Wiesbaden, Germany
| | - Lars Donath
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland.,Department of Intervention Research in Exercise Training, Institute of Exercise Training and Computer Science in Sport, German Sport University Cologne, Köln, Germany
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50
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Weberruss H, Maucher J, Oberhoffer R, Müller J. Recovery of the cardiac autonomic nervous and vascular system after maximal cardiopulmonary exercise testing in recreational athletes. Eur J Appl Physiol 2017; 118:205-211. [DOI: 10.1007/s00421-017-3762-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 11/08/2017] [Indexed: 12/19/2022]
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