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Sayegh ALC, Silva BM, Ferreira EVM, Ramos RP, Fisher JP, Nery LE, Ota-Arakaki JS, Oliveira RKF. Clinical utility of ventilatory and gas exchange evaluation during low-intensity exercise for risk stratification and prognostication in pulmonary arterial hypertension. Respirology 2020; 26:264-272. [PMID: 33118293 DOI: 10.1111/resp.13959] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 08/11/2020] [Accepted: 09/29/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVE Peak oxygen consumption (pVO2 ), determined from CPET, provides a valuable indication of PAH severity and patient prognosis. However, CPET is often contraindicated in severe PAH and frequently terminated prior to achievement of a sufficient exercise effort. We sought to determine whether in PAH low-intensity [i.e. freewheeling exercise (FW)] exercise reveals abnormal VE /VCO2 and PET CO2 responses that are associated with pVO2 and serve as indices of PAH risk stratification and mortality. METHODS Retrospective analysis of CPET from 97 PAH patients and 20 age-matched controls was undertaken. FW VE /VCO2 and PET CO2 were correlated with pVO2 % age-predicted. Prognostication analysis was conducted using pVO2 > 65% age-predicted, as known to represent a low mortality risk. Primary outcome was mortality from any cause. RESULTS FW PET CO2 was correlated with pVO2 (P < 0.0001; r = 0.52), while FW VE /VCO2 was not (P = 0.13; r = -0.16). ROC curve analyses showed that FW PET CO2 (AUC = 0.659), but not FW VE /VCO2 (AUC = 0.587), provided predictive information identifying pVO2 > 65% age-predicted (best cut-off value of 28 mm Hg). By Cox analysis, FW PET CO2 < 28 mm Hg remained a predictor of mortality after adjusting for age and PAH aetiology (HR: 2.360, 95% CI: 1.144-4.866, P = 0.020). CONCLUSION Low PET CO2 during FW is associated with reduced pVO2 in PAH and provides predictive information for PAH risk stratification and prognostication.
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Affiliation(s)
- Ana Luiza C Sayegh
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil.,Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Bruno Moreira Silva
- Department of Physiology, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - Eloara V M Ferreira
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - Roberta P Ramos
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - James P Fisher
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Luiz E Nery
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - Jaquelina S Ota-Arakaki
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - Rudolf K F Oliveira
- Division of Respiratory Diseases, Department of Medicine, Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
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Mood Responses to Passive and Active Motion Leg Cycling Exercise in Healthy Sedentary Young Adults. Adv Prev Med 2020; 2020:7282013. [PMID: 32181019 PMCID: PMC7066409 DOI: 10.1155/2020/7282013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 12/05/2019] [Accepted: 12/20/2019] [Indexed: 11/20/2022] Open
Abstract
Previous studies suggest that passive motion exercise (PME) may be useful for overcoming exercise limitations associated with a sedentary lifestyle, orthopedic disorders, and various other debilitating conditions. Negative mood response is one of the factors that limit a person's ability to exercise. Therefore, this study tests the hypothesis that the mood response associated with PME is not different than the mood response associated with active motion exercise (AME). Eight women and seven men participated in the study and were administrated the Profile of Mood States (POMS) during modes of PME and AME in a randomized order. Outcome of the POMS consisted of the total mood disturbance score [(feelings of tension + depression + fatigue + anger + confusion) − vigor]. ANOVA was used to determine significance of differences in total mood disturbance, oxygen uptake (V.O2), and middle cerebral blood flow velocity (MCAv) at baseline and immediately after 30-minute conditions of PME and AME. Postexercise total mood disturbance score was significantly decreased for both conditions (PME baseline 29.2 ± 5.2 vs. postexercise 16.4 ± 6.8, P < 0.05) and AME baseline 22.4 ± 4.4 vs. postexercise 13.1 ± 5.2, P < 0.05). These senses of changes in feelings were associated with significant physiological increases in V.O2 and MCAv during both PME and AME (P < 0.05). These results demonstrate that physiological and mood responses to passive and active motion cycling exercise are not different. Future studies should determine whether passive motion cycling exercise is a useful preventive medicine strategy for overcoming various disease-related exercise limitations and counteracting the adverse effects of sedentary lifestyles.
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Hasnan N, Mohamad Saadon NS, Hamzaid NA, Teoh MXH, Ahmadi S, Davis GM. Muscle oxygenation during hybrid arm and functional electrical stimulation-evoked leg cycling after spinal cord injury. Medicine (Baltimore) 2018; 97:e12922. [PMID: 30412097 PMCID: PMC6221724 DOI: 10.1097/md.0000000000012922] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
This study compared muscle oxygenation (StO2) during arm cranking (ACE), functional electrical stimulation-evoked leg cycling (FES-LCE), and hybrid (ACE+FES-LCE) exercise in spinal cord injury individuals. Eight subjects with C7-T12 lesions performed exercises at 3 submaximal intensities. StO2 was measured during rest and exercise at 40%, 60%, and 80% of subjects' oxygen uptake (VO2) peak using near-infrared spectroscopy. StO2 of ACE showed a decrease whereas in ACE+FES-LCE, the arm muscles demonstrated increasing StO2 from rest in all of VO2) peak respectively. StO2 of FES-LCE displayed a decrease at 40% VO2 peak and steady increase for 60% and 80%, whereas ACE+FES-LCE revealed a steady increase from rest at all VO2 peak. ACE+FES-LCE elicited greater StO2 in both limbs which suggested that during this exercise, upper- and lower-limb muscles have higher blood flow and improved oxygenation compared to ACE or FES-LCE performed alone.
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Affiliation(s)
- Nazirah Hasnan
- Department of Rehabilitation Medicine, Faculty of Medicine
| | | | - Nur Azah Hamzaid
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
| | - Mira Xiao-Hui Teoh
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
| | - Sirous Ahmadi
- Clinical Exercise and Rehabilitation Unit, Discipline of Exercise and Sport Sciences, Faculty of Health Sciences, The University of Sydney, Sydney, Australia
| | - Glen M. Davis
- Clinical Exercise and Rehabilitation Unit, Discipline of Exercise and Sport Sciences, Faculty of Health Sciences, The University of Sydney, Sydney, Australia
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Asahara R, Matsukawa K. Decreased prefrontal oxygenation elicited by stimulation of limb mechanosensitive afferents during cycling exercise. Am J Physiol Regul Integr Comp Physiol 2018; 315:R230-R240. [DOI: 10.1152/ajpregu.00454.2017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Our laboratory reported using near-infrared spectroscopy that feedback from limb mechanoafferents may decrease prefrontal oxygenated-hemoglobin concentration (Oxy-Hb) during the late period of voluntary and passive cycling. To test the hypothesis that the decreased Oxy-Hb of the prefrontal cortex would be augmented depending on the extent of limb mechanoafferent input, the prefrontal Oxy-Hb response was measured during motor-driven one- and two-legged passive cycling for 1 min at various revolutions of pedal movement in 19 subjects. Furthermore, we examined whether calculated tissue oxygenation index (TOI) decreased during passive cycling as the Oxy-Hb did, simultaneously assessing blood flows of extracranial cutaneous tissue and the common and internal carotid arteries (CCA and ICA) with laser and ultrasound Doppler flowmetry. Minute ventilation and cardiac output increased and peripheral resistance decreased during passive cycling, depending on both revolutions of pedal movement and number of limbs, whereas mean arterial blood pressure did not change. Passive cycling did not change end-tidal CO2, suggesting absence of a hypocapnic change. Prefrontal Oxy-Hb decreased during passive cycling, being in proportion to revolution of pedal movement but not number of cycling limbs. In addition, prefrontal TOI decreased during passive cycling as Oxy-Hb did, whereas blood flows of forehead cutaneous tissue, CCA, and ICA did not change significantly. Thus, a decrease in Oxy-Hb reflected a decrease in tissue blood flow of the intracerebral vasculature but not the extracerebral compartment. It is likely that feedback from mechanoafferents decreased regional cerebral blood flow of the prefrontal cortex in relation to the revolutions of pedal movement.
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Affiliation(s)
- Ryota Asahara
- Department of Integrative Physiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kanji Matsukawa
- Department of Integrative Physiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Tørhaug T, Brurok B, Hoff J, Helgerud J, Leivseth G. Arm Cycling Combined with Passive Leg Cycling Enhances VO 2peak in Persons with Spinal Cord Injury Above the Sixth Thoracic Vertebra. Top Spinal Cord Inj Rehabil 2017; 24:86-95. [PMID: 29434464 PMCID: PMC5791928 DOI: 10.1310/sci17-00029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Objective: To test whether passive leg cycling (PLC) during arm cycling ergometry (ACE) affects peak oxygen uptake (VO2peak) differently in individuals with spinal cord injury (SCI) at/above the 6th thoracic vertebra (T6) and below T6. Methods: We conducted a cross-sectional study, analyzed by univariate and multivariate regression models. Between- and within-group differences were examined during (a) ACE only, (b) ACE combined with PLC (ACE-PLC), and (c) ACE combined with functional electrical stimulation cycling (FES hybrid). Fifteen SCI subjects were recruited and grouped according to injury level: at/above T6 (SCI-high, n = 8) or below T6 (SCI-low, n = 7). VO2peak tests during ACE only, ACE-PLC, and FES hybrid were performed in random order on separate days. Results: In the SCI-high group, mean (SD) VO2peak was 19% higher during ACE-PLC than during ACE only [21.0 (3.8) vs 17.7 (5.0) mL·kg-1·min-1; p = .002], while VO2peak during FES hybrid cycling was 16% higher than during ACE-PLC [24.4 (4.1) mL·kg-1·min-1; p = .001]. No significant differences among exercise modalities were found for the SCI-low group. Conclusion: Additional training modalities (eg, PLC) during ACE facilitate exercise in SCI-high individuals, but not to the level of the FES hybrid method. Conversely, additional training modalities may not increase training load in SCI-low individuals.
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Affiliation(s)
- Tom Tørhaug
- St. Olavs University Hospital, Clinic of Physical Medicine and Rehabilitation, Department of Spinal Cord Injuries, Trondheim, Norway
- Norwegian University of Science and Technology, Faculty of Medicine, Department of Neuromedicine and Movement Science, Trondheim, Norway
| | - Berit Brurok
- St. Olavs University Hospital, Clinic of Physical Medicine and Rehabilitation, Department of Spinal Cord Injuries, Trondheim, Norway
- K.G. Jebsen Center of Exercise in Medicine, Department of Circulation and Medical Imaging Norwegian University of Science and Technology, Trondheim, Norway
| | - Jan Hoff
- St. Olavs University Hospital, Clinic of Physical Medicine and Rehabilitation, Department of Spinal Cord Injuries, Trondheim, Norway
- Norwegian University of Science and Technology, Faculty of Medicine, Department of Circulation and Imaging, Trondheim, Norway
| | - Jan Helgerud
- Norwegian University of Science and Technology, Faculty of Medicine, Department of Circulation and Imaging, Trondheim, Norway
- Hokksund Medical Rehabilitation Centre, Hokksund, Norway
- Telemark University College, Department of Sports and Outdoor Life Studies, Bø, Norway
| | - Gunnar Leivseth
- Norwegian University of Science and Technology, Faculty of Medicine, Department of Neuromedicine and Movement Science, Trondheim, Norway
- Department of Clinical Medicine, Neuromuscular Diseases Research Group, University of Tromsø, Norway
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Shi P, Hu S, Yu H. The response of the autonomic nervous system to passive lower limb movement and gender differences. Med Biol Eng Comput 2015; 54:1159-67. [PMID: 26319007 DOI: 10.1007/s11517-015-1378-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 08/21/2015] [Indexed: 10/23/2022]
Abstract
The aim of the present study was to identify the response of the autonomic nervous system (ANS) to passive lower limb movement and to determine whether there are gender differences. The experimental sets included 5 cycles per minute (CPM5), 10 cycles per minute (CPM10) and 15 cycles per minute (CPM15) on the passive cycling machine. ANS activity was measured using heart rate variability time domain analysis (RR interval, pNN50, RMSSD and SDNN), frequency domain analysis (TF, LF, HF and LF/HF) and Poincaré plot analysis (SD1, SD2 and SD1/SD2 ratio). The collected signal at rest served as the baseline (rest). Compared with the parameters at rest, the male subjects had decreased pNN50, decreased SDNN, lower TP and LF power (ms(2)), suppressed LF (n.u.), augmented HF (n.u.), suppressed LF/HF, decreased SD2 and increased SD1/SD2 ratios in response to CPM5 or CPM10 (all P < 0.05). Compared with the parameters at rest, decreased LF/HF and increased SD1/SD2 in response to CPM5 or CPM10 (all P < 0.05) were the only changes in the female subjects. LF/HF and SD1/SD2 differed between both groups for the same level of passive lower limb movement (all P < 0.05). These results suggest that passive lower limb movement leads to an ANS response and that male subjects are more sensitive to passive lower limb movements. During passive leg movements, sympathetic nervous activity is largely suppressed, and vagal activity achieves dominance. The response of the ANS to passive leg movement is determined by gender.
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Affiliation(s)
- Ping Shi
- Institute of Rehabilitation Engineering and Technology, University of Shanghai for Science and Technology, Shanghai, 200093, China.
| | - Sijung Hu
- School of Electronic, Electrical and Systems Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire, LE11 3TU, UK
| | - Hongliu Yu
- Institute of Rehabilitation Engineering and Technology, University of Shanghai for Science and Technology, Shanghai, 200093, China
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Hasnan N, Ektas N, Tanhoffer AIP, Tanhoffer R, Fornusek C, Middleton JW, Husain R, Davis GM. Exercise responses during functional electrical stimulation cycling in individuals with spinal cord injury. Med Sci Sports Exerc 2014; 45:1131-8. [PMID: 23685444 DOI: 10.1249/mss.0b013e3182805d5a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE This study compared acute exercise responses during arm cranking, functional electrical stimulation (FES)-assisted leg cycling, and combined arm and leg ("hybrid") cycling in individuals with spinal cord injury during maximal and submaximal exercise. METHODS Nine male subjects with long-standing neurological lesions from C7 to T12 were recruited. All subjects performed arm crank ergometry (ACE), FES leg cycle exercise (FES-LCE), combined ACE + FES-LCE, and cycling on a hybrid FES tricycle (HYBRID). They were assessed for their peak exercise responses in all four modalities. Subsequently, their submaximal heart rates (HR), cardiac outputs (Q), stroke volumes (SV), and arteriovenous oxygen extractions (Ca-Cv)O2 were measured at 40%, 60%, and 80% of mode-specific V˙O2peak. RESULTS Arm exercise alone and arm + leg exercise resulted in significantly higher V˙O2peak and HRpeak compared with FES-LCE (P < 0.05). Submaximal V˙O2 during FES-LCE was significantly lower than all other modalities across the range of exercise intensities (P < 0.05). ACE elicited 70%-94% higher steady-state V˙O2, and HYBRID evoked 99%-148% higher V˙O2 compared with FES-LCE. Steady-state FES-LCE also produced significantly lower Q, HR, and (Ca-Cv)O2. ACE evoked 31%-36% higher Q and 19%-47% greater HR than did FES-LCE. HYBRID elicited 31%-49% greater Q and 23%-56% higher HR than FES-LCE. CONCLUSIONS Combined arm and leg exercise can develop a higher oxygen uptake and greater cardiovascular demand compared with ACE or FES-LCE alone. These findings suggested that combined arm + leg FES training at submaximal exercise intensities may lead to greater gains of aerobic fitness than would arm exercise alone. These data also proffered that FES leg cycling exercise by itself may be insufficient to promote aerobic fitness in the spinal cord injury population.
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Affiliation(s)
- Nazirah Hasnan
- Clinical Exercise and Rehabilitation Unit, Faculty of Health Sciences, University of Sydney, Sydney, Australia.
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Yoshida T, Masani K, Sayenko DG, Miyatani M, Fisher JA, Popovic MR. Cardiovascular Response of Individuals With Spinal Cord Injury to Dynamic Functional Electrical Stimulation Under Orthostatic Stress. IEEE Trans Neural Syst Rehabil Eng 2013; 21:37-46. [DOI: 10.1109/tnsre.2012.2211894] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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West CR, Mills P, Krassioukov AV. Influence of the neurological level of spinal cord injury on cardiovascular outcomes in humans: a meta-analysis. Spinal Cord 2012; 50:484-92. [DOI: 10.1038/sc.2012.17] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Astorino TA, Harness ET. Substrate metabolism during exercise in the spinal cord injured. Eur J Appl Physiol 2009; 106:187-93. [PMID: 19224241 DOI: 10.1007/s00421-009-1005-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/27/2009] [Indexed: 11/25/2022]
Abstract
The primary aim of the study was to examine substrate metabolism during combined passive and active exercise in individuals with spinal cord injury (SCI). Nine men and women with SCI (mean age 40.6 +/- 3.4 years) completed two trials of submaximal exercise 1 week apart. Two maintained a complete injury and seven had an incomplete injury. Level of injury ranged from thoracic (T4-T6 and T10) to cervical (four C5-C6 and three C6-C7 injuries). During two bouts separated by 1 week, subjects completed two 30 min sessions of active lower-body and passive upper-body exercise, during which heart rate (HR) and gas exchange data were continuously assessed. One-way analysis of variance with repeated measures was used to examine differences in all variables over time. Results demonstrated significant increases (P < 0.05) in HR and oxygen uptake (VO(2)) from rest to exercise. Respiratory exchange ratio (RER) significantly increased (P < 0.05) during exercise from 0.85 +/- 0.02 at rest to 0.95 +/- 0.01 at the highest cadence, reflecting increasing reliance on carbohydrate from 50.0 to 83.0% of energy metabolism. Data demonstrate a large reliance on carbohydrate utilization during 30 min of exercise in persons with SCI, with reduced contribution of lipid as exercise intensity was increased. Strategies to reduce carbohydrate utilization and increase lipid oxidation in this population should be addressed.
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Affiliation(s)
- Todd Anthony Astorino
- Department of Kinesiology, CSU, San Marcos, MH 352, 333 S. Twin Oaks Valley Rd, San Marcos, CA 92096-0001, USA.
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Pressor response to passive walking-like exercise in spinal cord-injured humans. Clin Auton Res 2008; 19:113-22. [PMID: 19101752 DOI: 10.1007/s10286-008-0504-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Accepted: 09/22/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To examine blood pressure responses during passive walking-like exercise in the standing posture (PWE) in spinal cord-injured (SCI) humans. METHODS Twelve motor-complete SCI individuals (cervical level 6 to thoracic level 12, ASIA grade: A or B) and twelve able-bodied controls (CON) participated in this study. SCI individuals were divided into a group with injury level at or above thoracic (T) 6 (HSCI, n = 7) and a group with injury level at or below T10 (LSCI, n = 5). Subjects carried out 6-minute quiet standing and then 12-minute PWE at 1 Hz using a gait training apparatus that enables subjects to stand and move their legs passively. RESULTS Mean arterial blood pressures (MAPs) at standing in HSCI, LSCI and CON were 69 +/- 5, 83 +/- 4 and 93 +/- 2 mmHg, respectively. MAP changed significantly during PWE only in HSCI and CON, increasing to 88 +/- 4 (P < 0.001) and 98 +/- 1 mmHg (P < 0.01), respectively. The former group showed a larger increase in MAP (P < 0.001). INTERPRETATION Spinal sympathetic reflexes can be induced in a region isolated from the brainstem in response to a stimulus originating below the level of the spinal cord injury, and the magnitude of increase in blood pressure is greater in SCI individuals with lesion level at or above T6 due to loss of supraspinal control of the major sympathetic outflow. This central mechanism may be one of the reasons why greater pressor response to PWE was observed in HSCI.
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12
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Cardiovascular and Metabolic Responses During Functional Electric Stimulation Cycling at Different Cadences. Arch Phys Med Rehabil 2008; 89:719-25. [DOI: 10.1016/j.apmr.2007.09.035] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 09/11/2007] [Accepted: 09/11/2007] [Indexed: 11/24/2022]
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Abe D, Muraki S, Yanagawa K, Fukuoka Y, Niihata S. Changes in EMG characteristics and metabolic energy cost during 90-min prolonged running. Gait Posture 2007; 26:607-10. [PMID: 17276067 DOI: 10.1016/j.gaitpost.2006.12.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2006] [Revised: 12/06/2006] [Accepted: 12/09/2006] [Indexed: 02/02/2023]
Abstract
This study quantified the interaction of integrated electromyography (iEMG) obtained from the vastus lateralis and the metabolic energy cost of running (Cr), an index to assess running economy, during 90-min prolonged running. The iEMG during running was divided into eccentric (ECC) and concentric (CON) phases using a force platform and a knee-joint goniometer. The ratio of ECC to CON (ECC/CON ratio) significantly decreased during 90-min prolonged running in novice distance runners, which would be explained by an increase in muscle activity during the CON phase of running. The average Cr value significantly increased during 90-min prolonged running. The individual's Cr values significantly correlated with the ECC/CON ratio (r=-0.702, P<0.05). These results suggest that changes in the ECC/CON ratio and Cr value during prolonged running are associated.
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Affiliation(s)
- Daijiro Abe
- Faculty of Human Sciences, University of East Asia, Shimonoseki, Yamaguchi 751-8503, Japan.
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14
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Ballaz L, Fusco N, Crétual A, Langella B, Brissot R. Acute peripheral blood flow response induced by passive leg cycle exercise in people with spinal cord injury. Arch Phys Med Rehabil 2007; 88:471-6. [PMID: 17398248 DOI: 10.1016/j.apmr.2007.01.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To determine the acute femoral artery hemodynamic response in paraplegic subjects during a passive leg cycle exercise. DESIGN Case series. SETTING Department of physical medicine and rehabilitation in a university in France. PARTICIPANTS A volunteer sample of 15 people with traumatic spinal cord injury. INTERVENTION Subjects performed a 10-minute session of passive leg cycle exercise in the sitting position. MAIN OUTCOME MEASURES We measured heart rate, maximal (Vmax), and minimal femoral artery blood flow velocity at rest and immediately after the passive leg cycle exercise, using quantitative duplex Doppler ultrasound. We calculated mean blood flow velocity (Vmean) and velocity index, representing the peripheral resistance, for each condition. RESULTS Vmax and Vmean increased (from .80+/-.18 m/s to .96+/-.24 m/s, P<.01; and from .058+/-.02 m/s to .076+/-.03 m/s, P<.01; respectively) after 10 minutes of passive leg cycle exercise. Heart rate did not change. The velocity index decreased from 1.23+/-0.15 to 1.16+/-0.21 (P=.038). CONCLUSIONS The results of this study suggest that acute passive leg cycle exercise increases vascular blood flow velocity in paralyzed legs of people with paraplegia. This exercise could have clinical implications for immobilized persons.
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Affiliation(s)
- Laurent Ballaz
- Physiology and Biomechanics Laboratory, Sports Department, Rennes 2 University, France.
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Muraki S, Fornusek C, Raymond J, Davis GM. Muscle oxygenation during prolonged electrical stimulation-evoked cycling in paraplegics. Appl Physiol Nutr Metab 2007; 32:463-72. [PMID: 17510681 DOI: 10.1139/h07-007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigated cardiorespiratory responses and muscle oxygenation during prolonged electrical stimulation (ES)-evoked leg cycling in individuals with paraplegia (PARA). Four PARA and 6 able-bodied (AB) persons participated in this study. Subjects performed 10 min of passive cycling and 40 min of active cycling (PARA, ES cycling; AB, voluntary cycling) at workloads selected to elicit an equivalent oxygen uptake between groups. Cycling power output, cardiorespiratory responses, mechanical efficiency, and quadriceps muscle oxygenation (measured with near-infrared spectroscopy) were measured over the duration of the exercise. Oxygen uptake was similar in both groups during active cycling (PARA, 737 ± 177 mL·min–1; AB, 840 ± 90 mL·min–1). The cycling power output for PARA individuals commenced at 8.8 W, but varied considerably over 40 min. PARA individuals demonstrated markedly lower gross mechanical efficiency (~1.3%) during ES cycling compared with AB individuals performing voluntary exercise (~12.6%). During ES cycling, muscle oxygen saturation (SO2) decreased to approximately 72 ± 19%, whereas SO2 during volitional cycling was unaltered from resting levels. Muscle oxygenated haemoglobin initially decreased (–23%) during ES cycling, but returned to resting levels after 10 min. Deoxygenated haemoglobin initially rose during the first 5 min of ES cycling, and remained elevated by 28% thereafter. Upon cessation of ES cycling, lower-limb muscle oxygenation increased (+93%), suggesting reactive hyperaemia in PARA individuals after such exercise. During ES cycling, muscle oxygenation followed a different pattern to that observed in AB individuals performing voluntary cycling at an equivalent VO2. Equilibrium between oxygen demand and oxygen delivery was reached during prolonged ES cycling, despite the lack of neural adjustments of leg vasculature in the paralyzed lower limbs.
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Affiliation(s)
- Satoshi Muraki
- Department of Human Living System Design, Faculty of Design, Kyushu University, Japan
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Bell HJ. Respiratory control at exercise onset: an integrated systems perspective. Respir Physiol Neurobiol 2006; 152:1-15. [PMID: 16531126 DOI: 10.1016/j.resp.2006.02.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Revised: 02/06/2006] [Accepted: 02/06/2006] [Indexed: 10/24/2022]
Abstract
The near-immediate increase in breathing that accompanies the onset of constant load, dynamic exercise has remained a topic of interest to respiratory physiologists for the better part of a century. During this time, several theories have been proposed and tested in an attempt to explain what has been called the phase I response of exercise hyperpnoea, or the fast neural drive to breathe, and much controversy still remains as to what mediates this response. 'Central motor command' and 'afferent feedback' mechanisms, as described in animal models, have been centre stage in the debate, with much supportive evidence for their involvement. This review presents three relatively recent and controversial mechanisms and examines the increasing evidence for their involvement in the initial phase of exercise hyperpnoea: (1) the vascular distension hypothesis, (2) the vestibular feedback hypothesis and (3) the behavioral state hypothesis. Some outstanding fundamental questions and directions for future research are presented throughout, always with a focus on mechanistic efficacy in the integrated system response.
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Affiliation(s)
- Harold J Bell
- Department of Cell Biology and Anatomy, University of Calgary, Heritage Medical Research Building, Room 202, 3330 Hospital Dr. NW, Calgary, Alta., Canada, T2N 4N1.
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Higuchi Y, Kitamura S, Kawashima N, Nakazawa K, Iwaya T, Yamasaki M. Cardiorespiratory responses during passive walking-like exercise in quadriplegics. Spinal Cord 2005; 44:480-6. [PMID: 16317423 DOI: 10.1038/sj.sc.3101875] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
STUDY DESIGN Cross-sectional and comparative investigation using quadriplegics (QP) and nondisabled subjects (ND). OBJECTIVE To evaluate cardiorespiratory responses during passive walking-like exercise (PWE) in QP. SETTING National Rehabilitation Center for Persons with Disabilities in Japan. METHOD The subjects were seven male QP with complete lesion (age: 27.0 +/- 5.4, injured level: C6-C7) and six male ND (age: 26.3 +/- 4.5). Cardiorespiratory responses were measured until voluntary fatigue during PWE, the rhythmical activity of paralyzed lower limbs synchronized with arm movements. RESULTS There were no significant differences in oxygen consumption (VO(2)), pulmonary ventilation (VE), heart rate (HR) and oxygen pulse (O(2) pulse) between QP and ND during PWE. ND showed increased ventilatory equivalent for oxygen (VE/VO(2) ratio) during exercise, while QP showed a significantly greater respiratory rate (RR) during exercise than ND (P < 0.05). CONCLUSION PWE elicited an increase in VO(2) with workload increment in QP similar to ND. However, higher RR suggested the intrinsic dysfunction of RR control during submaximal exercise in QP. From these results, it was thought that respiratory response would be the restriction factor of efficient oxygen transportation during PWE in QP.
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Affiliation(s)
- Y Higuchi
- Department of Physical Training for Remedial Gymnastics, Hospital, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan
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Raymond J, Davis GM, van Der Plas MN, Groeller H, Simcox S. Carotid baroreflex control of heart rate and blood pressure during ES leg cycling in paraplegics. J Appl Physiol (1985) 2000; 88:957-65. [PMID: 10710391 DOI: 10.1152/jappl.2000.88.3.957] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study investigated control of heart rate (HR) and mean arterial pressure (MAP) at rest and during electrical stimulation (ES) leg cycling exercise (LCE) in paraplegics (Para). Seven men with complete spinal lesions (T(5)-T(11)) and six able-bodied (AB) men participated in this study. Beat-to-beat changes in HR and MAP were recorded during carotid sinus perturbation. Carotid baroreflex function curves were derived at rest and during ES-LCE for Para and during voluntary cycling (Vol) for AB. From rest to ES-LCE, oxygen uptake (VO(2)) increased (by 0.43 l/min) and HR rose (by 11 beats/min), yet MAP remained unchanged. In AB, Vol increased VO(2) (by 0.53 l/min), HR (by 22 beats/min), and MAP (by 8 mmHg). ES-LCE did not alter the carotid sinus pressure (CSP)-MAP relationship, but it displaced the CSP-HR relationship upward relative to rest. No rightward shift was observed during ES-LCE. Vol by AB produced an upward and rightward displacement of the CSP-MAP and CSP-HR relationships relative to rest. These findings suggested that the carotid sinus baroreflex was not reset during ES-LCE in Para.
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Affiliation(s)
- J Raymond
- Rehabilitation Research Centre, University of Sydney, Lidcombe, New South Wales 2141, Australia.
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Muraki S, Yamasaki M, Ehara Y, Kikuchi K, Seki K. Effect of maximal arm exercise on skin blood flux in the paralyzed lower limbs in persons with spinal cord injury. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY 1996; 74:481-3. [PMID: 8954297 DOI: 10.1007/bf02337730] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The purpose of the present study was to examine the effect of maximal arm exercise on the skin blood circulation of the paralyzed lower limbs in persons with spinal cord injury (PSCI). Eight male PSCI with complete lesions located between T3 and L1 performed graded maximal arm-cranking exercise (MACE) to exhaustion. The skin blood flux at the thigh (SBFT) and that at the calf (SBFC) were monitored using laser-Doppler flowmeter at rest and for 15 s immediately after the MACE. The subject's mean peak oxygen uptake and peak heart rate was 1.41 +/- 0.22 l.min-1 and 171.6 +/- 19.2 beats.min-1, respectively. No PSCI showed any increase in either SBFT or SBFC after the MACE, when compared with the values at rest. These results suggest that the blood circulation of the skin in the paralyzed lower limbs in PSCI is unaffected by the MACE.
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Affiliation(s)
- S Muraki
- Department of Health Science, Faculty of Integrated Arts and Sciences, Hiroshima University, Japan
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