51
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Callender NA, Hart PW, Ramchandani GM, Chaggar PS, Porter AJ, Billington CP, Tiller NB. The exercise pressor response to indoor rock climbing. J Appl Physiol (1985) 2020; 129:404-409. [PMID: 32644913 DOI: 10.1152/japplphysiol.00357.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This paper assessed the blood pressure, heart rate, and mouth-pressure responses to indoor rock climbing (bouldering) and associated training exercises. Six well-trained male rock climbers (mean ± SD age, 27.7 ± 4.7 yr; stature, 177.7 ± 7.3 cm; mass, 69.8 ± 12.1 kg) completed two boulder problems (6b and 7a+ on the Fontainebleau Scale) and three typical training exercises [maximum voluntary contraction (MVC) isometric pull-up, 80% MVC pull-ups to fatigue, and campus board to fatigue]. Blood pressure and heart rate were measured via an indwelling femoral arterial catheter, and mouth pressure via a mouthpiece manometer. Bouldering evoked a peak systolic pressure of 200 ± 17 mmHg (44 ± 21% increase from baseline), diastolic pressure of 142 ± 26 mmHg (70 ± 32% increase), mean arterial pressure of 163 ± 18 mmHg (56 ± 25% increase), and heart rate of 176 ± 22 beats/min (76 ± 35% increase). The highest systolic pressure was observed during the campus board exercise (218 ± 33 mmHg), although individual values as high as 273/189 mmHg were recorded. Peak mouth pressure during climbing was 31 ± 46 mmHg, and this increased independently of climb difficulty. We concluded that indoor rock climbing and associated exercises evoke a substantial pressor response resulting in high blood pressures that may exceed those observed during other upper-limb resistance exercises. These findings may inform risk stratification for climbers.NEW & NOTEWORTHY This case study provides original data on the exercise pressor response to indoor rock climbing and associated training exercises through the use of an indwelling femoral arterial catheter. Our subjects exhibited systolic/diastolic blood pressures that exceeded values often reported during upper-limb resistance exercise. Our data extend the understanding of the cardiovascular stress associated with indoor rock climbing.
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Affiliation(s)
- Nigel A Callender
- Department of Anaesthetics, Northumbria Specialist Emergency Care Hospital, Cramlington, United Kingdom.,School of Clinical and Applied Sciences, Leeds Beckett University, Leeds, United Kingdom
| | - Peter W Hart
- Department of Anaesthetics and Critical Care, Bradford Teaching Hospitals Foundation Trust, Bradford, United Kingdom
| | - Girish M Ramchandani
- Academy of Sport and Physical Activity, Sheffield Hallam University, Sheffield, United Kingdom
| | | | - Andrew J Porter
- Newcastle University Protein and Proteome Analysis, Newcastle University, Newcastle, United Kingdom
| | - Charlie P Billington
- Department of Anaesthetics, Dumfries and Galloway Royal Infirmary, Dumfries, United Kingdom
| | - Nicholas B Tiller
- Institute of Respiratory Medicine and Exercise Physiology, Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, California
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52
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Marsh CE, Thomas HJ, Naylor LH, Scurrah KJ, Green DJ. Fitness and strength responses to distinct exercise modes in twins: Studies of Twin Responses to Understand Exercise as a THerapy (STRUETH) study. J Physiol 2020; 598:3845-3858. [DOI: 10.1113/jp280048] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 06/10/2020] [Indexed: 01/15/2023] Open
Affiliation(s)
- Channa E. Marsh
- School of Human Sciences Exercise and Sport Science The University of Western Australia Perth WA Australia
| | - Hannah J. Thomas
- School of Human Sciences Exercise and Sport Science The University of Western Australia Perth WA Australia
| | - Louise H. Naylor
- School of Human Sciences Exercise and Sport Science The University of Western Australia Perth WA Australia
| | - Katrina J. Scurrah
- Twins Research Australia Centre for Epidemiology and Biostatistics Melbourne School of Population and Global Health The University of Melbourne Victoria Australia
| | - Daniel J. Green
- School of Human Sciences Exercise and Sport Science The University of Western Australia Perth WA Australia
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53
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Boldt K, Rios JL, Joumaa V, Herzog W. Mechanical function of cardiac fibre bundles is partly protected by exercise in response to diet-induced obesity in rats. Appl Physiol Nutr Metab 2020; 46:46-54. [PMID: 32598858 DOI: 10.1139/apnm-2020-0275] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Decrements in contractile function resulting from obesity are thought to be major reasons for the link between obesity and cardiovascular disease, while exercise has been shown to improve cardiac muscle contractile function. The purpose of this study was to evaluate cardiac contractile properties following obesity induction and the potential protective effect of exercise. Twelve-week-old rats (n = 30) were organized into either a chow diet or a high-fat, high-sucrose (HFHS) diet group. Following 12 weeks of obesity induction the HFHS group animals were stratified and grouped into sedentary (HFHS+Sed) and exercise (HFHS+Ex) groups for an additional 12 weeks. Following 24 weeks of diet intervention, with 12 weeks of aerobic exercise (25 m/min, 30 min/day, 5 days/week) for the HFHS+Ex group, skinned cardiac fibre bundle testing was used to evaluate cardiac contractile properties. Body fat and mass were significantly greater in the HFHS-fed animals compared with the chow controls (p < 0.043). Hearts from rats in the HFHS+Sed group had significantly greater mass (p < 0.03), significantly slower maximum shortening velocity (p = 0.001), and tended to have lower calcium sensitivity (p = 0.077) and a lower proportion of α-myosin heavy chain composition (p = 0.074) than the sedentary chow animals. However, 12 weeks of moderate aerobic exercise partially prevented these decrements in contractile properties. Novelty Cardiac muscle from animals exposed to an obesogenic diet for 24 weeks had impaired contractile properties compared with controls. Obesity-induced impairment of contractile properties of the heart were partially prevented by a 12-week aerobic exercise regime.
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Affiliation(s)
- Kevin Boldt
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada.,Human Performance Laboratory, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Jaqueline Lourdes Rios
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada.,Human Performance Laboratory, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Venus Joumaa
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada.,Human Performance Laboratory, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Walter Herzog
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada.,Human Performance Laboratory, University of Calgary, Calgary, AB T2N 1N4, Canada.,Biomechanics Laboratory, School of Sports, Federal University of Santa Catarina, SC 88040-900, Brazil
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54
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Tuttor M, von Stengel S, Kohl M, Lell M, Scharf M, Uder M, Wittke A, Kemmler W. High Intensity Resistance Exercise Training vs. High Intensity (Endurance) Interval Training to Fight Cardiometabolic Risk Factors in Overweight Men 30-50 Years Old. Front Sports Act Living 2020; 2:68. [PMID: 33345059 PMCID: PMC7739822 DOI: 10.3389/fspor.2020.00068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 05/14/2020] [Indexed: 12/19/2022] Open
Abstract
Cardiovascular and cardiometabolic diseases are leading causes of death worldwide. Exercise favorably affects this problem, however only few invest (enough) time to favorably influence cardiometabolic risk-factors and cardiac morphology/performance. Time-effective, high-intensity, low-volume exercise protocols might increase people's commitment to exercise. To date, most research has focused on high-intensity interval training (HIIT), the endurance type of HIT, while corresponding HIT-resistance training protocols (HIT-RT) are rarely evaluated. In this study we compared the effect of HIIT vs. HIT-RT, predominately on cardiometabolic and cardiac parameters in untrained, overweight-obese, middle-aged men. Eligible, untrained men aged 30–50 years old in full-time employment were extracted from two joint exercise studies that randomly assigned participants to a HIIT, HIT-RT or corresponding control group. HIIT predominately consisted of interval training 90 s−12 min, (2–4 sessions/week), HIT-RT (2–3 sessions/week) was applied as a single set resistance training to muscular failure. Core intervention length of both protocols was 16 weeks. Main inclusion criteria were overweight-obese status (BMI 25–35 kg/m2) and full employment (occupational working time: ≥38.5 h/week). Primary study-endpoint was the Metabolic Syndrome (MetS) Z-Score, secondary study-endpoints were ventricular stroke volume index (SVI) and myocardial mass index (MMI) as determined by Magnetic Resonance Imaging. The Intention to treat (ITT) principle was applied to analyze the summarized data set. Twenty-seven eligible men of the HIT-RT and 30 men of the HIIT group were included in the ITT. Both interventions significantly (p < 0.001) improve the MetS Z-Score, however the effect of HIIT was superior (p = 0.049). In parallel, HIT-RT and HIIT significantly affect SVI and MMI, with the effect of HIIT being much more pronounced (p < 0.001). Although HIIT endurance exercise was superior in favorably affecting cardiometabolic risk and particularly cardiac performance, both exercise methods positively affect cardiometabolic risk factors in this overweight to obese, middle-aged cohort of males with low time resources. Thus, the main practical application of our finding might be that in general overweight-obese people can freely choose their preferred exercise type (HIIT-END or HIT-RT) to improve their cardiometabolic health, while investing an amount of time that should be feasible for everybody. Trial Registrations: NCT01406730, NCT01766791.
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Affiliation(s)
- Michael Tuttor
- Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Simon von Stengel
- Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Matthias Kohl
- Department of Medical and Life Sciences, University of Furtwangen, Schwenningen, Germany
| | - Michael Lell
- Institute of Radiology, University-Hospital Nürnberg, Nürnberg, Germany
| | - Michael Scharf
- Department of Radiology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Michael Uder
- Department of Radiology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Andreas Wittke
- Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Wolfgang Kemmler
- Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
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55
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Exploring human trainability: Design and rationale of Studies of Twin Responses to Understand Exercise as a Therapy (STRUETH) study. Contemp Clin Trials Commun 2020; 19:100584. [PMID: 32577581 PMCID: PMC7300141 DOI: 10.1016/j.conctc.2020.100584] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 05/21/2020] [Accepted: 06/07/2020] [Indexed: 01/28/2023] Open
Abstract
Background Exercise confers myriad health benefits and physical inactivity is a modifiable risk factor for many non-communicable chronic diseases. However, individual responsiveness to guideline-based exercise programs is idiosyncratic for health and fitness outcomes. It is not known whether the response of individuals to distinct exercise modalities tend to be concordant or whether there is a genetic contribution to variation in exercise responsiveness. Methods/design Healthy, young adult (16-40yrs) monozygotic (MZ) and dizygotic (DZ) twin pairs were recruited and randomly assigned to 3 months of endurance or resistance exercise training. Twin pairs trained together. After 3 months of training in their randomly assigned mode, a washout period of 3 months was observed before twin pairs crossed over to complete 3 months of the alternate exercise intervention. Measures of cardiac morphology and function, cerebrovascular function, cognitive performance, peripheral artery function, biochemistry, blood pressure, body composition, skeletal muscle strength and cardiopulmonary fitness were collected before and after each exercise intervention (i.e. at weeks 0, 12, 24 and 36). Discussion We adopted exercise modalities that produce distinct haemodynamic and physiological stimuli for physiological adaptation and recruited MZ and DZ twin pairs to address questions such as; do individuals exhibit concordant responses to distinct exercise modalities? and what is the genetic contribution to adaptation resulting from distinct training modalities? The results of this study will provide insight into the genetic and environmental contribution to exercise response to distinct modes of training, with implications for determining the optimal approaches to exercise prescription.
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56
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The Impact of Sex on Left Ventricular Cardiac Adaptations to Endurance Training: a Systematic Review and Meta-analysis. Sports Med 2020; 50:1501-1513. [DOI: 10.1007/s40279-020-01294-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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57
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Bjerring AW, Landgraff HE, Leirstein S, Haugaa KH, Edvardsen T, Sarvari SI, Hallén J. From talented child to elite athlete: The development of cardiac morphology and function in a cohort of endurance athletes from age 12 to 18. Eur J Prev Cardiol 2020; 28:1061-1067. [PMID: 33611558 DOI: 10.1177/2047487320921317] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 04/02/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND Adult athletes undergo cardiac adaptions in what is known as the "athlete's heart". Cardiac adaptations in young athletes have not been described in longitudinal studies but have previously been believed to be uniform in nature. METHODS Seventy-six cross-country skiers were assessed at age 12. Forty-eight (63%) completed the first follow-up at age 15 and 36 (47%) the second follow-up at age 18. Comprehensive exercise data were collected. Echocardiography with three-dimensional measurements and cardiopulmonary exercise testing were performed at all time points. The cohort was divided into active and former endurance athletes, with an eight hours of weekly endurance exercise cut-off at age 18. RESULTS The athletes underwent eccentric remodelling between ages 12 and 15, and concentric remodelling between ages 15 and 18. At age 18, the active endurance athletes had greater increases in inter-ventricular wall thickness (1.8 ± 1.4 Δmm vs 0.6 ± 1.0 Δmm, p < 0.05), left ventricular (LV) posterior wall thickness (1.6 ± 1.2 Δmm vs 0.8 ± 0.8 Δmm, p < 0.05), LV mass (63 ± 30 Δg vs 27 ± 21 Δg, p < 0.01), right ventricular (RV) end-diastolic area (3.4 ± 4.0 Δcm2 vs 0.6 ± 3.5Δ cm2, p < 0.05), RV end-systolic area (1.0 ± 2.3 Δcm2 vs -0.9 ± 2.0 Δcm2, p < 0.05) and left atrial volume (24 ± 21 ΔmL vs 6±10 ΔmL, p < 0.05) and had greater indexed maximal oxygen uptake (66.3 ± 7.4 mL/min/kg vs 57.1 ± 8.2 mL/min/kg, p < 0.01). There was no significant difference for LV volumes. CONCLUSION This study finds a shift in the development of the young athlete's heart. Between ages 12 and 15, the active endurance athletes underwent eccentric remodelling. This dynamic switched to concentric remodelling between ages 15 and 18.
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Affiliation(s)
- Anders W Bjerring
- Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
| | | | | | - Kristina H Haugaa
- Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Thor Edvardsen
- Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Sebastian I Sarvari
- Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway
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58
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Cui D, Drake JC, Wilson RJ, Shute RJ, Lewellen B, Zhang M, Zhao H, Sabik OL, Onengut S, Berr SS, Rich SS, Farber CR, Yan Z. A novel voluntary weightlifting model in mice promotes muscle adaptation and insulin sensitivity with simultaneous enhancement of autophagy and mTOR pathway. FASEB J 2020; 34:7330-7344. [PMID: 32304342 DOI: 10.1096/fj.201903055r] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 02/17/2020] [Accepted: 03/04/2020] [Indexed: 12/23/2022]
Abstract
Our understanding of the molecular mechanisms underlying adaptations to resistance exercise remains elusive despite the significant biological and clinical relevance. We developed a novel voluntary mouse weightlifting model, which elicits squat-like activities against adjustable load during feeding, to investigate the resistance exercise-induced contractile and metabolic adaptations. RNAseq analysis revealed that a single bout of weightlifting induced significant transcriptome responses of genes that function in posttranslational modification, metabolism, and muscle differentiation in recruited skeletal muscles, which were confirmed by increased expression of fibroblast growth factor-inducible 14 (Fn14), Down syndrome critical region 1 (Dscr1) and Nuclear receptor subfamily 4, group A, member 3 (Nr4a3) genes. Long-term (8 weeks) voluntary weightlifting training resulted in significantly increases of muscle mass, protein synthesis (puromycin incorporation in SUnSET assay) and mTOR pathway protein expression (raptor, 4e-bp-1, and p70S6K proteins) along with enhanced muscle power (specific torque and contraction speed), but not endurance capacity, mitochondrial biogenesis, and fiber type transformation. Importantly, weightlifting training profound improved whole-body glucose clearance and skeletal muscle insulin sensitivity along with enhanced autophagy (increased LC3 and LC3-II/I ratio, and decreased p62/Sqstm1). These data suggest that resistance training in mice promotes muscle adaptation and insulin sensitivity with simultaneous enhancement of autophagy and mTOR pathway.
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Affiliation(s)
- Di Cui
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA.,Key Laboratory of Adolescent and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai, China
| | - Joshua C Drake
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Rebecca J Wilson
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA.,Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Robert J Shute
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Bevan Lewellen
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Mei Zhang
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA.,Departments of Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Henan Zhao
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Olivia L Sabik
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA.,Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Suna Onengut
- Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Stuart S Berr
- Department of Radiology and Medical Imaging, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Stephen S Rich
- Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Charles R Farber
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA.,Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, VA, USA.,Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Zhen Yan
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA.,Departments of Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA.,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, USA.,Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA, USA
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59
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Fanous Y, Dorian P. The prevention and management of sudden cardiac arrest in athletes. CMAJ 2020; 191:E787-E791. [PMID: 31308007 DOI: 10.1503/cmaj.190166] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Affiliation(s)
- Yehia Fanous
- Faculty of Medicine (Fanous, Dorian), University of Toronto; Division of Cardiology (Dorian), Department of Medicine, St. Michael's Hospital, Toronto, Ont
| | - Paul Dorian
- Faculty of Medicine (Fanous, Dorian), University of Toronto; Division of Cardiology (Dorian), Department of Medicine, St. Michael's Hospital, Toronto, Ont.
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60
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Brown B, Millar L, Somauroo J, George K, Sharma S, La Gerche A, Forsythe L, Oxborough D. Left ventricular remodeling in elite and sub-elite road cyclists. Scand J Med Sci Sports 2020; 30:1132-1139. [PMID: 32187398 DOI: 10.1111/sms.13656] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 03/03/2020] [Accepted: 03/11/2020] [Indexed: 12/14/2022]
Abstract
Marked adaptation of left ventricular (LV) structure in endurance athletes is well established. However, previous investigations of functional and mechanical adaptation have been contradictory. A lack of clarity in subjects' athletic performance level may have contributed to these disparate findings. This study aimed to describe structural, functional, and mechanical characteristics of the cyclists' LV, based on clearly defined performance levels. Male elite cyclists (EC) (n = 69), sub-elite cyclists (SEC) (n = 30), and non-athletes (NA) (n = 46) were comparatively studied using conventional and speckle tracking 2D echocardiography. Dilated eccentric hypertrophy was common in EC (34.7%), but not SEC (3.3%). Chamber concentricity was higher in EC compared to SEC (7.11 ± 1.08 vs 5.85 ± 0.98 g/(mL)2/3 , P < .001). Ejection fraction (EF) was lower in EC compared to NA (57 ± 5% vs 59 ± 4%, P < .05), and reduced EF was observed in a greater proportion of EC (11.6%) compared to SEC (6.7%). Global circumferential strain (GCε) was greater in EC (-18.4 ± 2.4%) and SEC (-19.8 ± 2.7%) compared to NA (-17.2 ± 2.6%) (P < .05 and P < .001). Early diastolic filling was lower in EC compared with SEC (0.72 ± 0.14 vs 0.88 ± 0.12 cm/s, P < .001), as were septal E' (12 ± 2 vs 15 ± 2 cm/s, P < .001) and lateral E' (18 ± 4 vs 20 ± 4 cm/s, P < .05). The magnitude of LV structural adaptation was far greater in EC compared with SEC. Increased GCε may represent a compensatory mechanism to maintain stroke volume in the presence of increased chamber volume. Decreased E and E' velocities may be indicative of a considerable functional reserve in EC.
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Affiliation(s)
- Benjamin Brown
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Lynne Millar
- Cardiovascular Sciences Research Centre, St Georges University of London, London, UK
| | - John Somauroo
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Keith George
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Sanjay Sharma
- Cardiovascular Sciences Research Centre, St Georges University of London, London, UK
| | - Andre La Gerche
- Sports Cardiology, Baker IDI Heart and Diabetes Institute, Melbourne, Vic., Australia
| | - Lynsey Forsythe
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - David Oxborough
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
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61
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Joseph G, Marott JL, Biering-Sørensen T, Johansen MN, Saevereid HA, Nielsen G, Schnohr P, Prescott E, Søgaard P, Mogelvang R. Level of Physical Activity, Left Ventricular Mass, Hypertension, and Prognosis. Hypertension 2020; 75:693-701. [DOI: 10.1161/hypertensionaha.119.14287] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Left ventricular hypertrophy is a strong predictor of prognosis in hypertension. Physical activity is associated with higher left ventricular mass but also reduced risk of cardiovascular outcomes. The aims were to explore whether (1) presence of hypertension modifies the association between physical activity and left ventricular mass; (2) the beneficial association between physical activity and prognostic outcome is modified by left ventricular hypertrophy. Randomly selected number of 3078 persons from the general population underwent echocardiogram. Left ventricular mass was indexed to body surface area. Level of physical activity was self-reported: inactivity, light activity, and moderate/high activity. Blood pressure was measured in rest: normal BP (<140/90 mm Hg) and hypertension (≥140/90 mm Hg or in pharmacological treatment for hypertension). Presence of hypertension modified the association between physical activity and left ventricular mass index significantly (test for interaction:
P
=0.01): in normal BP, higher levels of physical activity were associated with significantly higher left ventricular mass index (
P
<0.001), but this was not present in hypertension (
P
=0.90). Level of physical activity was associated with reduction in mortality and cardiovascular outcome independent of the presence of LVH (Persons with LVH: light activity HR, 0.77 [0.52–1.15], moderate/high activity HR, 0.61 [0.38–0.97]; test for interaction between LVH and level of physical activity
P
=0.71). In conclusion, persons with normal BP had higher left ventricular mass index at increased levels of physical activity, whereas this association was not present among persons with hypertension. Level of physical activity was associated with better prognosis independent of whether left ventricular hypertrophy was present or not.
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Affiliation(s)
- Gowsini Joseph
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
- Department of Clinical Medicine, Aalborg University, Denmark (G.J., P. Søgaard)
- Department of Cardiology and Centre for Clinical Research, North Denmark Regional Hospital, Hjorring, Denmark (G.J., G.N.)
- Department of Cardiology, Rigshospitalet (G.J., R.M.), University of Copenhagen, Denmark
| | - Jacob Louis Marott
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
| | - Tor Biering-Sørensen
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences (T.B.-S.), University of Copenhagen, Denmark
- Department of Cardiology, Herlev-Gentofte Hospital, University of Copenhagen, Hellerup, Denmark (T.B.-S.)
| | | | - Hans A. Saevereid
- Department of Cardiology, Bispebjerg-Frederiksberg Hospital (H.A.S., E.P.), University of Copenhagen, Denmark
| | - Gitte Nielsen
- Department of Cardiology and Centre for Clinical Research, North Denmark Regional Hospital, Hjorring, Denmark (G.J., G.N.)
| | - Peter Schnohr
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
- Department of Cardiology, Aalborg University Hospital, Denmark (M.N.J, P.S.)
| | - Eva Prescott
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
- Department of Cardiology, Bispebjerg-Frederiksberg Hospital (H.A.S., E.P.), University of Copenhagen, Denmark
| | - Peter Søgaard
- Department of Clinical Medicine, Aalborg University, Denmark (G.J., P. Søgaard)
| | - Rasmus Mogelvang
- From the The Copenhagen City Heart Study, Bispebjerg-Frederiksberg Hospital, University of Copenhagen, Denmark (G.J., J.L.M., T.B.-S., P. Schnohr, E.P., R.M.)
- Department of Cardiology, Rigshospitalet (G.J., R.M.), University of Copenhagen, Denmark
- Department of Clinical Research, University of Southern Denmark, Svendborg, Denmark (R.M.)
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A Systematic Review with Meta-Analysis of the Effect of Resistance Training on Whole-Body Muscle Growth in Healthy Adult Males. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17041285. [PMID: 32079265 PMCID: PMC7068252 DOI: 10.3390/ijerph17041285] [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: 12/30/2019] [Revised: 01/26/2020] [Accepted: 02/12/2020] [Indexed: 12/13/2022]
Abstract
We performed a systematic review and meta-analysis to study all published clinical trial interventions, determined the magnitude of whole-body hypertrophy in humans (healthy males) and observed the individual responsibility of each variable in muscle growth after resistance training (RT). Searches were conducted in PubMed, Web of Science and the Cochrane Library from database inception until 10 May 2018 for original articles assessing the effects of RT on muscle size after interventions of more than 2 weeks of duration. Specifically, we obtain the variables fat-free mass (FMM), lean muscle mass (LMM) and skeletal muscle mass (SMM). The effects on outcomes were expressed as mean differences (MD) and a random-effects meta-analysis and meta-regressions determined covariates (age, weight, height, durations in weeks…) to explore the moderate effect related to the participants and characteristics of training. One hundred and eleven studies (158 groups, 1927 participants) reported on the effects of RT for muscle mass. RT significantly increased muscle mass (FFM+LMM+SMM; Δ1.53 kg; 95% CI [1.30, 1.76], p < 0.001; I2 = 0%, p = 1.00). Considering the overall effects of the meta-regression, and taking into account the participants’ characteristics, none of the studied covariates explained any effect on changes in muscle mass. Regarding the training characteristics, the only significant variable that explained the variance of the hypertrophy was the sets per workout, showing a significant negative interaction (MD; estimate: 1.85, 95% CI [1.45, 2.25], p < 0.001; moderator: -0.03 95% CI [−0.05, −0.001] p = 0.04). In conclusion, RT has a significant effect on the improvement of hypertrophy (~1.5 kg). The excessive sets per workout affects negatively the muscle mass gain.
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Naylor LH, Maslen BA, Cox KL, Spence AL, Robey E, Haynes A, Carter HH, Lautenschlager NT, Ridgers ND, Pestell C, Green DJ. Land- versus water-walking interventions in older adults: Effects on body composition. J Sci Med Sport 2020; 23:164-170. [DOI: 10.1016/j.jsams.2019.08.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 08/02/2019] [Accepted: 08/22/2019] [Indexed: 01/19/2023]
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Hawley JA, Joyner MJ, Green DJ. Mimicking exercise: what matters most and where to next? J Physiol 2020; 599:791-802. [PMID: 31749163 PMCID: PMC7891316 DOI: 10.1113/jp278761] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 10/21/2019] [Indexed: 12/19/2022] Open
Abstract
The past decade has witnessed growing scientific and commercial interest in the identification of bioactive oral compounds that mimic or potentiate the effects of exercise, so-called 'exercise pills' or 'exercise mimetics.' These compounds have, to date, typically targeted skeletal muscle in an attempt to stimulate some of the adaptations to exercise induced by endurance training. Accordingly, they fail to impart many of the broad health protecting effects of exercise that are seen in tissues and organs other than skeletal muscle. In the context that multiple integrative regulatory and often redundant pathways have evolved to detect and respond to human movement, here we consider the complex challenges of designing a pill that might mimic the extensive range of exercise benefits. In particular, we consider the limits of the current 'myocentric' paradigm given the wide-ranging array of impacts that exercise exerts on atherosclerosis and the cardiovascular system. We discuss the validity and limitations of the concept that low dose cardiovascular polypills, already in large scale trials, may represent one form of cardiovascular exercise mimetic. Finally, given that some calls for an exercise pill stem from a response to the perceived failure of expert advice, evidence-based guidelines and current public health approaches, we explore possible strategies that might address the global rise in inactivity. In the event that a broad spectrum exercise mimetic might ever be developed, we discuss some generic issues related to adoption and adherence of therapeutic interventions.
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Affiliation(s)
- John A Hawley
- Exercise and Nutrition Research Group, Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Australia
| | - Michael J Joyner
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Daniel J Green
- School of Human Sciences (Exercise and Sport Sciences), The University of Western Australia, Perth, Australia
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Tofas T, Draganidis D, Deli CK, Georgakouli K, Fatouros IG, Jamurtas AZ. Exercise-Induced Regulation of Redox Status in Cardiovascular Diseases: The Role of Exercise Training and Detraining. Antioxidants (Basel) 2019; 9:antiox9010013. [PMID: 31877965 PMCID: PMC7023632 DOI: 10.3390/antiox9010013] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 12/10/2019] [Accepted: 12/13/2019] [Indexed: 02/07/2023] Open
Abstract
Although low levels of reactive oxygen species (ROS) are beneficial for the organism ensuring normal cell and vascular function, the overproduction of ROS and increased oxidative stress levels play a significant role in the onset and progression of cardiovascular diseases (CVDs). This paper aims at providing a thorough review of the available literature investigating the effects of acute and chronic exercise training and detraining on redox regulation, in the context of CVDs. An acute bout of either cardiovascular or resistance exercise training induces a transient oxidative stress and inflammatory response accompanied by reduced antioxidant capacity and enhanced oxidative damage. There is evidence showing that these responses to exercise are proportional to exercise intensity and inversely related to an individual’s physical conditioning status. However, when chronically performed, both types of exercise amplify the antioxidant defense mechanism, reduce oxidative stress and preserve redox status. On the other hand, detraining results in maladaptations within a time-frame that depends on the exercise training intensity and mode, as high-intensity training is superior to low-intensity and resistance training is superior to cardiovascular training in preserving exercise-induced adaptations during detraining periods. Collectively, these findings suggest that exercise training, either cardiovascular or resistance or even a combination of them, is a promising, safe and efficient tool in the prevention and treatment of CVDs.
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Pelliccia A, Caselli S, Sharma S, Basso C, Bax JJ, Corrado D, D'Andrea A, D'Ascenzi F, Di Paolo FM, Edvardsen T, Gati S, Galderisi M, Heidbuchel H, Nchimi A, Nieman K, Papadakis M, Pisicchio C, Schmied C, Popescu BA, Habib G, Grobbee D, Lancellotti P. European Association of Preventive Cardiology (EAPC) and European Association of Cardiovascular Imaging (EACVI) joint position statement: recommendations for the indication and interpretation of cardiovascular imaging in the evaluation of the athlete's heart. Eur Heart J 2019; 39:1949-1969. [PMID: 29029207 DOI: 10.1093/eurheartj/ehx532] [Citation(s) in RCA: 188] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/23/2017] [Indexed: 12/14/2022] Open
Affiliation(s)
- Antonio Pelliccia
- Institute of Sports Medicine and Science, Largo Piero Gabrielli, 1, 00197 Rome, Italy
| | - Stefano Caselli
- Institute of Sports Medicine and Science, Largo Piero Gabrielli, 1, 00197 Rome, Italy
| | | | - Cristina Basso
- Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy
| | - Jeroen J Bax
- Departmentt of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Domenico Corrado
- Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy
| | - Antonello D'Andrea
- Department of Cardiology, Monaldi Hospital, Second University of Naples, Naples, Italy
| | - Flavio D'Ascenzi
- Division of Cardiology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Fernando M Di Paolo
- Institute of Sports Medicine and Science, Largo Piero Gabrielli, 1, 00197 Rome, Italy
| | - Thor Edvardsen
- Department of Cardiology, Center of Cardiologic Innovation, Oslo University Hospital, University of Oslo, Oslo, Norway
| | | | - Maurizio Galderisi
- Department of Advanced Biomedical Sciences, Federico II University of Naples, Naples, Italy
| | - Hein Heidbuchel
- Jessa Hospital, Hasselt University and Heart Center Hasselt, Hasselt, Belgium
| | | | - Koen Nieman
- Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Cataldo Pisicchio
- Institute of Sports Medicine and Science, Largo Piero Gabrielli, 1, 00197 Rome, Italy
| | | | - Bogdan A Popescu
- Institute of Cardiovascular Diseases, University of Medicine and Pharmacy 'Carol Davila', Bucharest, Romania
| | - Gilbert Habib
- Department of Cardiology, Hôpital La Timone, Marseille, France
| | - Diederick Grobbee
- Department of Epidemiology, University Medical Center, Utrecht, The Netherlands
| | - Patrizio Lancellotti
- Department of Cardiology, GIGA Cardiovascular Sciences, University of Liège Hospital, Valvular Disease Clinic, Belgium
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Galanti G, Toncelli L, Tosi B, Orlandi M, Giannelli C, Stefani L, Mascherini G, Modesti PA. Evaluation of left ventricular remodelling in young Afro-Caribbean athletes. Cardiovasc Ultrasound 2019; 17:20. [PMID: 31630681 PMCID: PMC6802107 DOI: 10.1186/s12947-019-0169-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 09/03/2019] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Cardiac adaptation to intense physical training is determined by many factors including age, gender, body size, load training and ethnicity. Despite the wide availability of ECG analysis, with a higher presence of abnormalities in different races, echocardiographic studies on young Afro-Caribean (AA) and Caucasian athletes (CA) are lacking in literature. We aimed to assess the effect in the secondary LV remodelling of load training in young AA players compared to matched CA players. METHOD Seventy-seven AA and 53 CA matched soccer players (mean age 17.35 ± 0.50 and 18.25 ± 0.77 y) were enrolled. They were evaluated with echocardiography. A subgroup of 30 AA and 27 CA were followed up for a period of 4 years. The myocardial contractile function was evaluated by speckle-tracking echocardiographic global longitudinal strain (GLS). RESULTS No significant differences were found in weight and height and in blood pressure response to maximal ergometer test in either group. In AA a higher level of LV remodelling, consisting in higher LV wall thickness, higher interventricular septum (IVS) and posterior wall (PW) thickness were found (IVS: 10.04 ± 0.14 and 9.35 ± 0.10 in AA and CA respectively, p < 0.001. PW: 9.70 ± 0.20 and 9.19 ± 0.10 mm in AA and CA respectively, p < 0.05). Strain data showed no significant differences between the two groups (22.35 ± 0.48 and 23.38 ± 0.69 in AA (n = 27) and CA (n = 25), respectively). At the beginning of the follow-up study AA showed a significantly higher left ventricular remodelling (IVS = 9.29 ± 0.3 and 8.53 ± 0.12 mm in AA and CA respectively, p < 0.002. PW = 9.01 ± 0.2 and 8.40 ± 0.20 in AA and CA respectively, p = 0.1). During the next four years of follow-up we observed a regular parallel increase in LV wall thickness and chamber diameters in both groups, proportionally to the increase in body size and LV mass. (IVS = 10.52 ± 0.17 and 9.03 ± 0.22 mm in AA and CA respectively, p < 0.001. PW: 10.06 ± 0.17 and 8.26 ± 0.19 mm in AA and CA respectively, p < 0.001). CONCLUSION The study shows that the ventricular remodelling observed in AA appears to be a specific phenotype already present in pre-adolescence. These data also suggest that genetic/ethnic factors play a central role in left ventricular remodelling during the first years of life in elite athletes.
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Affiliation(s)
- Giorgio Galanti
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Loira Toncelli
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Benedetta Tosi
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Melissa Orlandi
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Chiara Giannelli
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Laura Stefani
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Gabriele Mascherini
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
| | - Pietro A. Modesti
- Department of Experimental and Clinical Medicine-Sports Medicine and Exercise Unit, University of Florence, AOUC, Careggi, Florence, Italy
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Opondo MA, Aiad N, Cain MA, Sarma S, Howden E, Stoller DA, Ng J, van Rijckevorsel P, Hieda M, Tarumi T, Palmer MD, Levine BD. Does High-Intensity Endurance Training Increase the Risk of Atrial Fibrillation? A Longitudinal Study of Left Atrial Structure and Function. Circ Arrhythm Electrophysiol 2019; 11:e005598. [PMID: 29748195 DOI: 10.1161/circep.117.005598] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 03/12/2018] [Indexed: 11/16/2022]
Abstract
BACKGROUND Exercise mitigates many cardiovascular risk factors associated with atrial fibrillation. Endurance training has been associated with atrial structural changes which can increase the risk for atrial fibrillation. The dose of exercise training required for these changes is uncertain. We sought to evaluate the impact of exercise on left atrial (LA) mechanical and electrical function in healthy, sedentary, middle-aged adults. METHODS Sixty-one adults (52±5 years) were randomized to either 10 months of high-intensity exercise training or yoga. At baseline and post-training, all participants underwent maximal exercise stress testing to assess cardiorespiratory fitness, P-wave signal-averaged electrocardiography for filtered P-wave duration and atrial late potentials (root mean square voltage of the last 20 ms), and echocardiography for LA volume, left ventricular end-diastolic volume, and mitral inflow for assessment of LA active emptying. Post-training data were compared with 14 healthy age-matched Masters athletes. RESULTS LA volume, Vo2 max, and left ventricular end-diastolic volume increased in the exercise group (15%, 17%, and 16%, respectively) with no change in control (P<0.0001). LA active emptying decreased post-exercise versus controls (5%; P=0.03). No significant changes in filtered P-wave duration or root mean square voltage of the last 20 ms occurred after exercise training. LA and left ventricular volumes remained below Masters athletes. The athletes had longer filtered P-wave duration but no difference in the frequency of atrial arrhythmia. CONCLUSIONS Changes in LA structure, LA mechanical function, and left ventricular remodeling occurred after 10 months of exercise but without significant change in atrial electrical activity. A longer duration of training may be required to induce electrical changes thought to cause atrial fibrillation in middle-aged endurance athletes. CLINICAL TRIAL REGISTRATION URL: https://www.clinicaltrials.gov. Unique Identifier: NCT02039154.
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Affiliation(s)
- Mildred A Opondo
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.).,Department of Cardiovascular Medicine, Stanford University School of Medicine, CA (M.A.O.)
| | - Norman Aiad
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Matthew A Cain
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Satyam Sarma
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Erin Howden
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Douglas A Stoller
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Jason Ng
- Department of Medicine, University of Illinois at Chicago (J.N.)
| | - Pieter van Rijckevorsel
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Michinari Hieda
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Takashi Tarumi
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.).,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - M Dean Palmer
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
| | - Benjamin D Levine
- Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center, Dallas (N.A., M.A.C., S.S., E.H., D.A.S., M.H., T.T., B.D.L.). .,Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (M.A.O., N.A., M.A.C., S.S., E.H., D.A.S., P.v.R., M.H., T.T., M.D.P., B.D.L.)
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Baggish AL. Prolonged Systole and Reduced Ejection Fraction among Competitive Athletes: Slow and Low but Able to Go. J Am Soc Echocardiogr 2019; 32:997-999. [DOI: 10.1016/j.echo.2019.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 05/28/2019] [Accepted: 05/28/2019] [Indexed: 10/26/2022]
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Au JS, Oikawa SY, Morton RW, Phillips SM, MacDonald MJ, Stöhr EJ. Unaltered left ventricular mechanics and remodelling after 12 weeks of resistance exercise training – a longitudinal study in men. Appl Physiol Nutr Metab 2019; 44:820-826. [DOI: 10.1139/apnm-2018-0544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous longitudinal studies suggest that left ventricular (LV) structure is unaltered with resistance exercise training (RT) in young men. However, evidence from aerobic exercise training suggests that early changes in functional LV wall mechanics may occur prior to and independently of changes in LV size, although short-term changes in LV mechanics and structural remodelling in response to RT protocols have not been reported. Therefore, the purpose of this study was to examine the effects of RT on LV mechanics in healthy men performing 2 different time-under-tension protocols. Forty recreationally trained men (age: 23 ± 3 years) were randomized into 12 weeks of whole-body higher-repetition RT (20–25 repetitions/set to failure at ∼30%–50% 1 repetition maximum (1RM); n = 13), lower-repetition RT (8–12 repetitions/set to failure at ∼75%–90% 1RM; n = 13), or an active control period (n = 14). Speckle tracking echocardiography was performed at baseline and following the intervention period. Neither RT program altered standard measures of LV volumes (end-diastolic volume, end-systolic volume, or ejection fraction; P > 0.05) or indices of LV mechanics (total LV twist, untwisting rate, twist-to-shortening ratio, untwisting-to-twist ratio, or longitudinal strain; P > 0.05). This is the first longitudinal study to assess both LV size and mechanics after RT in healthy men, suggesting a maintenance of LV size and twist mechanics despite peripheral muscle adaptations to the training programs. These results provide no evidence for adverse LV structural or functional remodelling in response to RT in young men and support the positive role of RT in the maintenance of optimal cardiovascular function, even with strenuous RT.
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Affiliation(s)
- Jason S. Au
- Department of Kinesiology, McMaster University, Hamilton, ON L8S 4K1, Canada
| | - Sara Y. Oikawa
- Department of Kinesiology, McMaster University, Hamilton, ON L8S 4K1, Canada
| | - Robert W. Morton
- Department of Kinesiology, McMaster University, Hamilton, ON L8S 4K1, Canada
| | - Stuart M. Phillips
- Department of Kinesiology, McMaster University, Hamilton, ON L8S 4K1, Canada
| | | | - Eric J. Stöhr
- Discipline of Physiology & Health, Cardiff School of Sport, Cardiff Metropolitan University, Cardiff CF5 2YB, Wales, UK
- Department of Medicine, Columbia University Irving Medical Centre, NY 10032, USA
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Abstract
BACKGROUND There is limited data regarding ventricular remodeling in college female athletes, especially when appropriate scaling of cardiac dimensions to lean body mass (LBM) is considered. Moreover, it is not well established whether cardiac remodeling in female athletes is a balanced process with proportional increase in left ventricular (LV) mass and volume or the right and LV size. METHODS During the preparticipation competitive screening, 72 female college athletes volunteered to undergo dual energy x-ray absorptiometry scan for quantification of LBM and comprehensive 2D echocardiography including assessment of longitudinal myocardial strain. The athletes were divided in 2 groups according to the intensity of the dynamic and static components of their sport categories, ie, a higher intensity dynamic and resistive group (n = 37 participating in rowing, water polo and lacrosse) and a lower intensity group (n = 35, participating in short distance running, sailing, synchronized swimming, and softball). In addition, we recruited a group of 31 age-matched nonathlete controls. RESULTS The mean age of the study population was 18.7 ± 1.0 years. When scaled to body surface area, the higher intensity group had 17.1 ± 3.6% (P < 0.001) greater LV mass when compared with the lower intensity group and 21.7 ± 4.0% (P < 0.001) greater LV mass than the control group. The differences persisted after scaling to LBM with 14.2 ± 3.2% (P < 0.001) greater LV mass in the higher intensity group. By contrast, there was no difference in any of the relative remodeling indices including the LV mass to volume ratio, right to LV area ratio, or left atrial to LV volume ratio (P > 0.50 for all). In addition, no significant difference was noted among the 3 groups in LV ejection fraction (P = 0.22), LV global longitudinal strain (P = 0.55), LV systolic strain rate (P = 0.62), or right ventricular global longitudinal strain (P = 0.61). CONCLUSION Female collegiate athletes participating in higher intensity dynamic and resistive sports have higher indexed LV mass even when scaled to LBM. The remodeling process does however appear to be a balanced process not only at the intraventricular level but also at the interventricular and atrioventricular levels.
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Falz R, Fikenzer S, Holzer R, Laufs U, Fikenzer K, Busse M. Acute cardiopulmonary responses to strength training, high-intensity interval training and moderate-intensity continuous training. Eur J Appl Physiol 2019; 119:1513-1523. [PMID: 30963239 DOI: 10.1007/s00421-019-04138-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 04/03/2019] [Indexed: 12/17/2022]
Abstract
PURPOSE Long-term effects of exercise training are well studied. Acute hemodynamic responses to various training modalities, in particularly strength training (ST), have only been described in a few studies. This study examines the acute responses to ST, high-intensity interval training (HIIT) and moderate-intensity continuous training (MCT). METHODS Twelve young male subjects (age 23.4 ± 2.6 years; BMI 23.7 ± 1.5 kg/m2) performed an incremental exertion test and were randomized into HIIT (4 × 4-min intervals), MCT (continuous cycling) and ST (five body-weight exercises) which were matched for training duration. The cardiopulmonary (impedance cardiography, ergo-spirometry) and metabolic response were monitored. RESULTS Similar peak blood lactate responses were observed after HIIT and ST (8.5 ± 2.6 and 8.1 ± 1.2 mmol/l, respectively; p = 0.83). The training impact time was 90.7 ± 8.5% for HIIT and 68.2 ± 8.5% for MCT (p < 0.0001). The mean cardiac output was significantly higher for HIIT compared to that of MCT and ST (23.2 ± 4.1 vs. 20.9 ± 2.9 vs. 12.9 ± 2.9 l/min, respectively; p < 0.0001). VO2max was twofold higher during HIIT compared to that observed during ST (2529 ± 310 vs. 1290 ± 156 ml; p = 0.0004). Among the components of ST, squats compared with push-ups resulted in different heart rate (111 ± 13.5 vs. 125 ± 15.7 bpm, respectively; p < 0.05) and stroke volume (125 ± 23.3 vs. 104 ± 19.8 ml, respectively; p < 0.05). CONCLUSIONS Despite an equal training duration and a similar acute metabolic response, large differences with regard to the training impact time and the cardiopulmonary response give evident. HIIT and MCT, but less ST, induced a sufficient cardiopulmonary response, which is important for the preventive effects of training; however, large differences in intensity were apparent for ST.
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Affiliation(s)
- Roberto Falz
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany.
| | - Sven Fikenzer
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Roman Holzer
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany
| | - Ulrich Laufs
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Kati Fikenzer
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Martin Busse
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany
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Forsythe L, Somauroo J, George K, Papadakis M, Brown B, Qasem M, Oxborough D. The right heart of the elite senior rugby football league athlete. Echocardiography 2019; 36:888-896. [DOI: 10.1111/echo.14330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/25/2019] [Accepted: 03/06/2019] [Indexed: 11/27/2022] Open
Affiliation(s)
- Lynsey Forsythe
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
| | - John Somauroo
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
| | - Keith George
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
| | - Michael Papadakis
- Cardiovascular Sciences Research CentreSt Georges University of London London UK
| | - Benjamin Brown
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
| | - Mohammad Qasem
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
| | - David Oxborough
- Research Institute for Sport and Exercise SciencesLiverpool John Moores University Liverpool UK
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74
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Oxborough DL, Spence A, George KP, Van Oorschot F, Thijssen DHT, Green DJ. Impact of 24 weeks of supervised endurance versus resistance exercise training on left ventricular mechanics in healthy untrained humans. J Appl Physiol (1985) 2019; 126:1095-1102. [DOI: 10.1152/japplphysiol.00405.2018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In addition to the well-known cardiac structural adaptation to exercise training, little work has examined changes in left ventricle (LV) mechanics. With new regional and global indexes available we sought to determine the effect of 24-wk endurance versus resistance training on LV mechanics. Twenty-three male subjects were randomly allocated to a 24-wk endurance or resistance training program. Pre- and posttraining two-dimensional echocardiographic images were acquired. Global LV mechanics [strain (ε)] were recorded in longitudinal, circumferential, and radial planes. Rotation was assessed at apical and basal levels. In addition, longitudinal ε-volume loops, across the cardiac cycle, were constructed from simultaneous LV ε (longitudinal and transverse strain) and volume measurements across the cardiac cycle as a novel measure of LV mechanics. Marginal differences in ε and rotation data were found between groups. After training, we found no change in global peak ε data. Peak basal rotation significantly increased after training, with changes in the endurance group (−2.2 ± 1.9° to −4.5 ± 3.3°) and the resistance group (−2.9 ± 3.0° to −3.4 ± 2.9°). LV ε-volume loops revealed a modest rightward shift in both groups. Although most global and regional indexes of LV mechanics were not significantly altered, 24 wk of intense supervised exercise training increased basal rotation. Further studies that assess LV mechanics in larger cohorts of subjects and those with cardiovascular disease and risk factors may reveal important training impacts. NEW & NOTEWORTHY This study builds on previous work by our group and presents a comprehensive assessment of cardiac mechanics after dichotomous exercise training programs. We highlight novel findings in addition to the inclusion of strain-volume loops, which shed light on subtle differences in longitudinal and transverse contribution to volume change throughout the cardiac cycle. Our findings suggest that training has an impact on basal rotation and possibly strain-volume loops.
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Affiliation(s)
- David L. Oxborough
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
| | - Angela Spence
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Nedlands, Western Australia, Australia
- School of Physiotherapy and Exercise Science, Curtin University, Bentley, Western Australia, Australia
| | - Keith P. George
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
| | - Frederieke Van Oorschot
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
- Radboud Institute for Health Sciences, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Dick H. T. Thijssen
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
- Radboud Institute for Health Sciences, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Daniel J. Green
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Nedlands, Western Australia, Australia
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75
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Foulds HJA, Bredin SSD, Warburton DER. Ethnic differences in the cardiac responses to aerobic exercise. ETHNICITY & HEALTH 2019; 24:168-181. [PMID: 28438042 DOI: 10.1080/13557858.2017.1315377] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 03/14/2017] [Indexed: 06/07/2023]
Abstract
Background: Cardiovascular disease disproportionately affects North American Indigenous populations. Ethnic differences in cardiac responses to exercise are known, though Indigenous populations response is unknown. To evaluate cardiac responses to aerobic exercise among Canadian Indigenous and European adults. Methods: Indigenous (N = 12, 4 females, 1 male incomplete) and European (N = 12, all completed) Canadian age and sex-matched adults 19-40 years and free of cardiovascular disease or diabetes completed a cycle ergometer maximal aerobic power test and 30 min at 60% maximal aerobic capacity on two separate days. Echocardiographic assessments preceded and immediately followed exercise. Results: Responses to maximal exercise were similar among ethnicities including decreases in stroke volume index, cardiac output index and ejection fraction, and increases in arterial-ventricular coupling. However, following submaximal exercise, only Indigenous adults demonstrated reductions in end systolic volume, end diastolic volume (154.8 ± 40.6 mL to 136.5 ± 33.0 mL, p = 0.01, vs. 149.4 ± 22.4 mL to 147.1 ± 27.0 mL; p = 0.81), stroke volume index (44.9 ± 8.7 mL m-2 to 38.0 ± 6.5 mL m-2, p = 0.002, vs. 46.4 ± 7.1 mL m-2 to 44.0 ± 6.5 mL m-2; p = 0.28) and arterial compliance. Conclusion: Indigenous and European adults demonstrated similar cardiac responses to maximal exercise, though only Indigenous adults demonstrated cardiac responses to submaximal exercise.
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Affiliation(s)
- Heather J A Foulds
- a Cardiovascular Physiology and Rehabilitation Laboratory , University of British Columbia , Vancouver , Canada
- b Experimental Medicine Program, Faculty of Medicine , University of British Columbia , Vancouver , Canada
- c Physical Activity Promotion and Chronic Disease Prevention Unit , Vancouver , Canada
| | - Shannon S D Bredin
- c Physical Activity Promotion and Chronic Disease Prevention Unit , Vancouver , Canada
| | - Darren E R Warburton
- a Cardiovascular Physiology and Rehabilitation Laboratory , University of British Columbia , Vancouver , Canada
- b Experimental Medicine Program, Faculty of Medicine , University of British Columbia , Vancouver , Canada
- c Physical Activity Promotion and Chronic Disease Prevention Unit , Vancouver , Canada
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76
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Currie KD, Coates AM, Slysz JT, Aubry RL, Whinton AK, Mountjoy ML, Millar PJ, Burr JF. Left Ventricular Structure and Function in Elite Swimmers and Runners. Front Physiol 2018; 9:1700. [PMID: 30546320 PMCID: PMC6279850 DOI: 10.3389/fphys.2018.01700] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 11/12/2018] [Indexed: 11/13/2022] Open
Abstract
Sport-specific differences in the left ventricle (LV) of land-based athletes have been observed; however, comparisons to water-based athletes are sparse. The purpose of this study was to examine differences in LV structure and function in elite swimmers and runners. Sixteen elite swimmers [23 (2) years, 81% male, 69% white] and 16 age, sex, and race matched elite runners participated in the study. All athletes underwent resting echocardiography and indices of LV dimension, global LV systolic and diastolic function, and LV mechanics were determined. All results are presented as swimmers vs. runners. Early diastolic function was lower in swimmers including peak early transmitral filling velocity [76 (13) vs. 87 (11) cm ⋅ s-1, p = 0.02], mean mitral annular peak early velocity [16 (2) vs. 18 (2) cm ⋅ s-1, p = 0.01], and the ratio of peak early to late transmitral filling velocity [2.68 (0.59) vs. 3.29 (0.72), p = 0.005]. The diastolic mechanics index of time to peak untwisting rate also occurred later in diastole in swimmers [12 (10)% diastole vs. 5 (4)% diastole, p = 0.01]. Cardiac output was larger in swimmers [5.8 (1.5) vs. 4.7 (1.2) L ⋅ min-1, p = 0.04], which was attributed to their higher heart rates [56 (6) vs. 49 (6) bpm, p < 0.001] given stroke volumes were similar between groups. All other indices of LV systolic function and dimensions were similar between groups. Our findings suggest enhanced early diastolic function in elite runners relative to swimmers, which may be attributed to faster LV untwisting.
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Affiliation(s)
- Katharine D. Currie
- Terry Kavanagh Heart Health Lab, Faculty of Kinesiology & Physical Education, University of Toronto, Toronto, ON, Canada
- Department of Kinesiology, Michigan State University, East Lansing, MI, United States
| | - Alexandra M. Coates
- Human Performance and Health Research Laboratory, University of Guelph, Guelph, ON, Canada
| | - Joshua T. Slysz
- Human Performance and Health Research Laboratory, University of Guelph, Guelph, ON, Canada
| | - Rachel L. Aubry
- Human Performance and Health Research Laboratory, University of Guelph, Guelph, ON, Canada
| | - Alanna K. Whinton
- Human Performance and Health Research Laboratory, University of Guelph, Guelph, ON, Canada
| | - Margo L. Mountjoy
- Fédération Internationale de Natation, Lausanne, Switzerland
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Philip J. Millar
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
- Toronto General Hospital Research Institute, Toronto, ON, Canada
| | - Jamie F. Burr
- Human Performance and Health Research Laboratory, University of Guelph, Guelph, ON, Canada
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
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77
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Oláh A, Kovács A, Lux Á, Tokodi M, Braun S, Lakatos BK, Mátyás C, Kellermayer D, Ruppert M, Sayour AA, Barta BA, Merkely B, Radovits T. Characterization of the dynamic changes in left ventricular morphology and function induced by exercise training and detraining. Int J Cardiol 2018; 277:178-185. [PMID: 30442376 DOI: 10.1016/j.ijcard.2018.10.092] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/06/2018] [Accepted: 10/26/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND Although exercise-induced cardiac hypertrophy has been intensively investigated, its development and regression dynamics have not been comprehensively described. In the current study, we aimed to characterize the effects of regular exercise training and detraining on left ventricular (LV) morphology and function. METHODS Rats were divided into exercised (n = 12) and control (n = 12) groups. Exercised rats swam 200 min/day for 12 weeks. After completion of the training protocol, rats remained sedentary for 8 weeks (detraining period). Echocardiographic follow-up was performed regularly to obtain LV long- and short-axis recordings for speckle-tracking echocardiography analysis. Global longitudinal and circumferential strain and systolic strain rate were measured. LV pressure-volume analysis was performed using additional groups of rats to obtain haemodynamic data. RESULTS Echocardiographic examinations showed the development of LV hypertrophy in the exercised group. These differences disappeared during the detraining period. Strain and strain rate values were all increased after the training period, whereas supernormal values rapidly reversed to the control level after training cessation. Load-independent haemodynamic indices, e.g., preload recruitable stroke work, confirmed the exercise-induced systolic improvement and complete regression after detraining. CONCLUSIONS AND TRANSLATIONAL ASPECT Our results provide the first comprehensive data to describe the development and regression dynamics of morphological and functional aspects of physiological hypertrophy in detail. Speckle-tracking echocardiography has been proven to be feasible to follow-up changes induced by exercise training and detraining and might provide an early possibility to differentiate between physiological and pathological conditions.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary.
| | - Attila Kovács
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Árpád Lux
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Márton Tokodi
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | | | - Csaba Mátyás
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Alex Ali Sayour
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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78
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Augustine DX, Howard L. Left Ventricular Hypertrophy in Athletes: Differentiating Physiology From Pathology. CURRENT TREATMENT OPTIONS IN CARDIOVASCULAR MEDICINE 2018; 20:96. [PMID: 30367318 DOI: 10.1007/s11936-018-0691-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
PURPOSE OF REVIEW The changes that occur in athlete's heart are influenced by a number of factors including age, gender, ethnicity and the type of cardiovascular training. It is therefore important that the clinician is able to integrate all of these factors when assessing athletes to be able to guide investigations appropriately and to distinguish pathology from physiology. This review discusses the potential diagnostic conundrums when trying to differentiate physiological left ventricular hypertrophy from pathological hypertrophic cardiomyopathy in athletes. The mechanism of physiological and pathological hypertrophy is discussed together with history, clinical and investigational findings that can help to identify pathology. RECENT FINDINGS Athletes with hypertrophic cardiomyopathy are more likely to have non-concentric left ventricular hypertrophy (LVH), an elevated relative wall thickness, lateral ECG changes and a smaller LV cavity than athletes with physiological LVH. Certain diastolic echocardiographic parameters when used as part of an algorithm (e'; E/E'; E/A) can help to distinguish physiology from pathology, and there is evidence that assessment of global longitudinal strain during exercise echocardiography may be of use in the future. Cardiac MRI is an important imaging modality that can have an additive effect over echocardiography in the diagnosis of cardiomyopathy. Late gadolinium enhancement is a recognised advantage for cardiac magnetic resonance to allow detection of fibrosis in hypertrophic cardiomyopathy. T1 mapping and extracellular volume quantification may be a tool for the future to help distinguish athlete's heart from HCM. Cardiac adaptation to exercise and training in athletes, the athlete's heart causes electrophysiological and geometric changes that may mimic mild phenotypes of a pathological cardiomyopathy. This review article summarises a systematic approach to the assessment of left ventricular hypertrophy in athletes and describes pertinent clinical and investigation findings that can help to differentiate physiology from pathology.
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Affiliation(s)
- Daniel X Augustine
- Royal United Hospital Bath NHS Foundation Trust, Bath, UK.
- Cardiology Clinical Academic Group, St George's, University of London, London, UK.
| | - Liz Howard
- Cardiology Clinical Academic Group, St George's, University of London, London, UK
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79
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de Gregorio C, Di Nunzio D, Di Bella G. Athlete's Heart and Left Heart Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018. [PMID: 29532331 DOI: 10.1007/5584_2018_176] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Physical activity comprises all muscular activities that require energy expenditure. Regular sequence of structured and organized exercise with the specific purpose of improving wellness and athletic performance is defined as a sports activity.Exercise can be performed at various levels of intensity and duration. According to the social context and pathways, it can be recreational, occupational, and competitive. Therefore, the training burden varies inherently and the heart adaptation is challenging.Although a general agreement on the fact that sports practice leads to metabolic, functional and physical benefits, there is evidence that some athletes may be subjected to adverse outcomes. Sudden cardiac death can occur in apparently healthy individuals with unrecognized cardiovascular disease.Thus, panels of experts in sports medicine have promoted important pre-participation screening programmes aimed at determining sports eligibility and differentiating between physiological remodeling and cardiac disease.In this review, the most important pathophysiological and diagnostic issues are discussed.
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Affiliation(s)
- Cesare de Gregorio
- Department of Clinical and Experimental Medicine - Cardiology Unit, University Hospital Medical School "Gaetano Martino", Messina, Italy.
| | - Dalia Di Nunzio
- Department of Clinical and Experimental Medicine - Cardiology Unit, University Hospital Medical School "Gaetano Martino", Messina, Italy
| | - Gianluca Di Bella
- Department of Clinical and Experimental Medicine - Cardiology Unit, University Hospital Medical School "Gaetano Martino", Messina, Italy
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80
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Ryffel CP, Eser P, Trachsel LD, Brugger N, Wilhelm M. Age at start of endurance training is associated with patterns of left ventricular hypertrophy in middle-aged runners. Int J Cardiol 2018; 267:133-138. [PMID: 29957253 DOI: 10.1016/j.ijcard.2018.04.111] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 04/06/2018] [Accepted: 04/23/2018] [Indexed: 12/30/2022]
Abstract
BACKGROUND Left ventricular hypertrophy (LVH) is a physiological adaptation to long-term endurance training. We investigated the impact of age at start of endurance training on LV geometry in a cohort of male, middle-aged, non-elite endurance athletes. METHODS A total of 121 healthy, normotensive, Caucasian participants of a 10-mile race were recruited and assessed with an echocardiogram and a comprehensive interview. Athletes were classified based on patterns of LVH. RESULTS Thirty-five athletes (31%) had LVH. Athletes with eccentric LVH (16%) were significantly younger at start of endurance training compared to athletes with concentric LVH (15%, 14 ± 5 years vs. 31 ± 8 years; P < 0.001). Although the yearly volume of endurance training was comparable between athletes with eccentric and concentric LVH, athletes with eccentric LVH had shorter race times. All athletes with an increased LV end diastolic volume index (LVEDVI; ≥74 ml/m2) started endurance training before or at age 25. CONCLUSIONS In our cohort of non-elite middle-aged runners, eccentric LVH was found only in athletes with an early start of endurance training. In case of a mature starting age, endurance training may, contrary to what is commonly assumed, also lead to concentric LVH. The consideration of endurance training starting age may lead to a better understanding of morphological adaptations of the heart.
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Affiliation(s)
- Christoph P Ryffel
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Prisca Eser
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Lukas D Trachsel
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Nicolas Brugger
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Matthias Wilhelm
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland.
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81
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Fulghum K, Hill BG. Metabolic Mechanisms of Exercise-Induced Cardiac Remodeling. Front Cardiovasc Med 2018; 5:127. [PMID: 30255026 PMCID: PMC6141631 DOI: 10.3389/fcvm.2018.00127] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 08/23/2018] [Indexed: 12/13/2022] Open
Abstract
Exercise has a myriad of physiological benefits that derive in part from its ability to improve cardiometabolic health. The periodic metabolic stress imposed by regular exercise appears fundamental in driving cardiovascular tissue adaptation. However, different types, intensities, or durations of exercise elicit different levels of metabolic stress and may promote distinct types of tissue remodeling. In this review, we discuss how exercise affects cardiac structure and function and how exercise-induced changes in metabolism regulate cardiac adaptation. Current evidence suggests that exercise typically elicits an adaptive, beneficial form of cardiac remodeling that involves cardiomyocyte growth and proliferation; however, chronic levels of extreme exercise may increase the risk for pathological cardiac remodeling or sudden cardiac death. An emerging theme underpinning acute as well as chronic cardiac adaptations to exercise is metabolic periodicity, which appears important for regulating mitochondrial quality and function, for stimulating metabolism-mediated exercise gene programs and hypertrophic kinase activity, and for coordinating biosynthetic pathway activity. In addition, circulating metabolites liberated during exercise trigger physiological cardiac growth. Further understanding of how exercise-mediated changes in metabolism orchestrate cell signaling and gene expression could facilitate therapeutic strategies to maximize the benefits of exercise and improve cardiac health.
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Affiliation(s)
- Kyle Fulghum
- Department of Medicine, Envirome Institute, Institute of Molecular Cardiology, Diabetes and Obesity Center, Louisville, KY, United States
- Department of Physiology, University of Louisville, Louisville, KY, United States
| | - Bradford G. Hill
- Department of Medicine, Envirome Institute, Institute of Molecular Cardiology, Diabetes and Obesity Center, Louisville, KY, United States
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82
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Baggish AL. Exercise-Induced Cardiac Remodeling: Competitive Athletes Are Just the Tip of the Iceberg. Circ Cardiovasc Imaging 2018; 9:CIRCIMAGING.116.005321. [PMID: 27502062 DOI: 10.1161/circimaging.116.005321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Aaron L Baggish
- From the Cardiovascular Performance Program, Massachusetts General Hospital, Boston.
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83
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Boldt KR, Rios JL, Joumaa V, Herzog W. Force properties of skinned cardiac muscle following increasing volumes of aerobic exercise in rats. J Appl Physiol (1985) 2018; 125:495-503. [PMID: 29722623 PMCID: PMC6139514 DOI: 10.1152/japplphysiol.00631.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 04/19/2018] [Accepted: 04/30/2018] [Indexed: 11/22/2022] Open
Abstract
The positive effects of chronic endurance exercise training on health and performance have been well documented. These positive effects have been evaluated primarily at the structural level, and work has begun to evaluate mechanical adaptations of the myocardium. However, it remains poorly understood how the volume of exercise training affects cardiac adaptation. To gain some understanding, we subjected 3-mo-old Sprague-Dawley rats ( n = 23) to treadmill running for 11 wk at one of three exercise volumes (moderate, high, and extra high). Following training, hearts were excised and mechanical testing was completed on skinned trabecular fiber bundles. Performance on a maximal fitness test was dose dependent on training volume, where greater levels of training led to greater performance. No differences were observed between animals from any group for maximal active stress and passive stress at a sarcomere length of 2.2 µm. Heart mass and passive stress at sarcomere lengths beyond 2.4 µm increased in a dose-dependent manner for animals in the control and moderate- and high-duration groups. However, hearts from animals in the extra high-duration group presented with inhibited responses for heart mass and passive stress, despite performing greatest on a graded treadmill fitness test. These results suggest that heart mass and passive stress adapt in a dose-dependent manner, until exercise becomes excessive and adaptation is inhibited. Our findings are in agreement with the beneficial role exercise has in cardiac adaptation. However, excessive exercise comes with risks of maladaptation, which must be weighed against the desire to increase performance. NEW & NOTEWORTHY For the first time, we present findings on cardiac trabecular muscle passive stiffness and show the effect of excessive exercise on the heart. We demonstrated that heart mass increases with exercise until a maximum, after which greater exercise volume results in inhibited adaptation. At paraphysiological lengths, passive stiffness increases with exercise but to a lesser degree with excessive training. Despite greater performance on graded exercise tests, animals in the highest trained group exhibited possible maladaptation.
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Affiliation(s)
- Kevin R Boldt
- Human Performance Laboratory, University of Calgary , Calgary, Alberta , Canada
- Faculty of Kinesiology, University of Calgary , Calgary, Alberta , Canada
| | - Jaqueline L Rios
- Human Performance Laboratory, University of Calgary , Calgary, Alberta , Canada
- Faculty of Kinesiology, University of Calgary , Calgary, Alberta , Canada
| | - Venus Joumaa
- Human Performance Laboratory, University of Calgary , Calgary, Alberta , Canada
- Faculty of Kinesiology, University of Calgary , Calgary, Alberta , Canada
| | - Walter Herzog
- Human Performance Laboratory, University of Calgary , Calgary, Alberta , Canada
- Faculty of Kinesiology, University of Calgary , Calgary, Alberta , Canada
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Abstract
The field of sports cardiology has advanced significantly over recent times. It has incorporated clinical and research advances in cardiac imaging, electrophysiology and exercise physiology to enable better diagnostic and therapeutic management of our patients. One important endeavour has been to try and better differentiate athletic cardiac remodelling from inherited cardiomyopathies and other pathologies. Whilst our diagnostic tools have improved, there have also been errors resulting from assumptions that the pathological traits observed in the general population would be generalisable to athletic populations. However, we have learnt that athletes with hypertrophic cardiomyopathy, for example, have many unique features when compared with non-athletic patients with hypertrophic cardiomyopathy. We are learning the limitations of cross-sectional observations and a greater number of prospective studies have been initiated which should enable us to more confidently interrogate the associations between exercise, cardiac remodelling and clinical outcomes. This review of the field enables some of the world's experts in sports cardiology to reflect on where there is a need for research focus to advance knowledge and clinical care in sports cardiology.
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85
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The relationship between left ventricular structure and function in the elite rugby football league athlete as determined by conventional echocardiography and myocardial strain imaging. Int J Cardiol 2018; 261:211-217. [PMID: 29657045 DOI: 10.1016/j.ijcard.2018.01.140] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/11/2018] [Accepted: 01/31/2018] [Indexed: 12/30/2022]
Abstract
AIMS The aims of this study were to establish the left ventricular (LV) phenotype in rugby football league (RFL) athletes and to mathematically model the association between LV size, strain (ɛ) and ejection fraction (EF). METHODS AND RESULTS 139 male athletes underwent echocardiographic LV evaluation including ɛ imaging. Non-athletic males were used for comparison. All absolute and scaled structural indices were significantly larger (P < 0.05) in athletes with a predominance for normal LV geometry. EF and global ɛ were similar between groups but strain rates (SR) were significantly lower (P < 0.05) in athletes. Lower apical rotation (P < 0.001) and twist (P = 0.010) were exhibited in athletes. CONCLUSION Normal EF is explained by divergent effects of LV internal diastolic dimension (LVIDd) and mean wall thickness (MWT) on LV function. Reductions in SR and twist may be part of normal physiological LV adaptation in RFL athletes.
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86
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Gabrielli L, Sitges M, Chiong M, Jalil J, Ocaranza M, Llevaneras S, Herrera S, Fernandez R, Saavedra R, Yañez F, Vergara L, Diaz A, Lavandero S, Castro P. Potential adverse cardiac remodelling in highly trained athletes: still unknown clinical significance. Eur J Sport Sci 2018; 18:1288-1297. [DOI: 10.1080/17461391.2018.1484174] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Luigi Gabrielli
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marta Sitges
- Cardiology Department, IDIBAPS, Hospital Clínic, Barcelona, Spain
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS) & CEMC, Facultad Ciencias Químicas y Farmacéuticas y Facultad Medicina, Universidad Católica de Chile, Santiago, Chile
| | - Jorge Jalil
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - María Ocaranza
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Silvana Llevaneras
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Sebastian Herrera
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Rodrigo Fernandez
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Rodrigo Saavedra
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Fernando Yañez
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Luis Vergara
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alexis Diaz
- Advanced Center for Chronic Diseases (ACCDiS) & CEMC, Facultad Ciencias Químicas y Farmacéuticas y Facultad Medicina, Universidad Católica de Chile, Santiago, Chile
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS) & CEMC, Facultad Ciencias Químicas y Farmacéuticas y Facultad Medicina, Universidad Católica de Chile, Santiago, Chile
- Cardiology Division, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Pablo Castro
- Advanced Center for Chronic Diseases (ACCDiS) & División Enfermedades Cardiovasculares. Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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87
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Brosnan MJ, Rakhit D. Differentiating Athlete's Heart From Cardiomyopathies - The Left Side. Heart Lung Circ 2018; 27:1052-1062. [PMID: 29891249 DOI: 10.1016/j.hlc.2018.04.297] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 04/22/2018] [Indexed: 01/01/2023]
Abstract
In athletes who undertake a high volume of high intensity exercise, the resultant changes in cardiac structure and function which develop as a result of physiological adaptation to exercise (so called "Athlete's Heart") may overlap with some features of pathological conditions. This chapter will focus on the left side of the heart, where left ventricular cavity enlargement, increase in left ventricular wall thickness and increased left ventricular trabeculation associated with athletic remodelling may sometimes be difficult to differentiate from conditions such as dilated cardiomyopathy, hypertrophic cardiomyopathy or isolated left ventricular non-compaction. The distinction between physiological versus pathological changes in athletes is imperative as an incorrect diagnosis can have important consequences, such as exclusion from competitive sport, or false reassurance and missed opportunity for effective therapeutic intervention.
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Affiliation(s)
| | - Dhrubo Rakhit
- University Hospital Southampton, Southampton, Hampshire, UK.
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88
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Pedlar CR, Brown MG, Shave RE, Otto JM, Drane A, Michaud-Finch J, Contursi M, Wasfy MM, Hutter A, Picard MH, Lewis GD, Baggish AL. Cardiovascular response to prescribed detraining among recreational athletes. J Appl Physiol (1985) 2018; 124:813-820. [DOI: 10.1152/japplphysiol.00911.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Exercise-induced cardiac remodeling (EICR) and the attendant myocardial adaptations characteristic of the athlete’s heart may regress during periods of exercise reduction or abstinence. The time course and mechanisms underlying this reverse remodeling, specifically the impact of concomitant plasma volume (PV) contraction on cardiac chamber size, remain incompletely understood. We therefore studied recreational runners ( n = 21, age 34 ± 7 yr; 48% male) who completed an 18-wk training program (~7 h/wk) culminating in the 2016 Boston Marathon after which total exercise exposure was confined to <2 h/wk (no single session >1 h) for 8 wk. Cardiac structure and function, exercise capacity, and PV were assessed at peak fitness (10–14 days before) and at 4 wk and 8 wk postmarathon. Mixed linear modeling adjusting for age, sex, V̇o2peak, and marathon finish time was used to compare data across time points. Physiological detraining was evidenced by serial reductions in treadmill performance. Two distinct phases of myocardial remodeling and hematological adaptation were observed. After 4 wk of detraining, there were significant reductions in PV (Δ −6.0%, P < 0.01), left ventricular (LV) wall thickness (Δ −8.1%, <0.05), LV mass (Δ −10.3%, P < 0.001), and right atrial area (Δ −8.2%, P < 0.001). After 8 wk of detraining, there was a significant reduction in right ventricle chamber size (end-diastolic area Δ = −8.0%, P < 0.05) without further concomitant reductions in PV or LV wall thickness. Abrupt reductions in exercise training stimulus result in a structure-specific time course of reverse cardiac remodeling that occurs largely independently of PV contraction. NEW & NOTEWORTHY Significant reverse cardiac remodeling, previously documented among competitive athletes, extends to recreational runners and occurs with a distinct time course. Initial reductions in plasma volume and left ventricular (LV) mass, driven by reductions in wall thickness, are followed by contraction of the right ventricle. Consistent with data from competitive athletes, LV chamber volumes appear less responsive to detraining and may be a more permanent adaptation to sport.
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Affiliation(s)
- Charles R. Pedlar
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
- School of Sport, Health and Applied Science, St Mary’s University, Twickenham, United Kingdom
| | - Marcel G. Brown
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Robert E. Shave
- Cardiff Centre for Exercise and Health, Cardiff Metropolitan University, Cardiff, United Kingdom
| | - James M. Otto
- Division of Surgery and Interventional Science, University College London, London, United Kingdom
| | - Aimee Drane
- Cardiff Centre for Exercise and Health, Cardiff Metropolitan University, Cardiff, United Kingdom
| | - Jennifer Michaud-Finch
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Miranda Contursi
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Meagan M. Wasfy
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Adolph Hutter
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Michael H. Picard
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Gregory D. Lewis
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Aaron L. Baggish
- Cardiovascular Performance Program, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
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Oxborough D, Augustine D, Gati S, George K, Harkness A, Mathew T, Papadakis M, Ring L, Robinson S, Sandoval J, Sarwar R, Sharma S, Sharma V, Sheikh N, Somauroo J, Stout M, Willis J, Zaidi A. A guideline update for the practice of echocardiography in the cardiac screening of sports participants: a joint policy statement from the British Society of Echocardiography and Cardiac Risk in the Young. Echo Res Pract 2018; 5:G1-G10. [PMID: 29551755 PMCID: PMC5861331 DOI: 10.1530/erp-17-0075] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 02/02/2018] [Indexed: 12/19/2022] Open
Abstract
Sudden cardiac death (SCD) in an athlete is a rare but tragic event. In view of this, pre-participation cardiac screening is mandatory across many sporting disciplines to identify those athletes at risk. Echocardiography is a primary investigation utilized in the pre-participation setting and in 2013 the British Society of Echocardiography and Cardiac Risk in the Young produced a joint policy document providing guidance on the role of echocardiography in this setting. Recent developments in our understanding of the athlete’s heart and the application of echocardiography have prompted this 2018 update.
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Affiliation(s)
- David Oxborough
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | | | - Sabiha Gati
- Royal Brompton and Harefield Hospitals NHS Foundation Trust, London, UK
| | - Keith George
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Allan Harkness
- Colchester Hospital University NHS Foundation Trust, Colchester, UK
| | - Thomas Mathew
- Nottingham University Hospitals NHS Trust, Nottingham, UK
| | | | - Liam Ring
- West Suffolk Hospital NHS Foundation Trust, Bury St Edmonds, UK
| | | | | | - Rizwan Sarwar
- Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | | | - Vishal Sharma
- Royal Liverpool and Broadgreen University Hospitals, Liverpool, UK
| | | | - John Somauroo
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Martin Stout
- School of Healthcare Science, Manchester Metropolitan University, Manchester, UK
| | - James Willis
- Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
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Stöhr EJ, Stembridge M, Shave R, Samuel TJ, Stone K, Esformes JI. Systolic and Diastolic Left Ventricular Mechanics during and after Resistance Exercise. Med Sci Sports Exerc 2018; 49:2025-2031. [PMID: 28915224 DOI: 10.1249/mss.0000000000001326] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE To improve the current understanding of the impact of resistance exercise on the heart, by examining the acute responses of left ventricular (LV) strain, twist, and untwisting rate ("LV mechanics"). METHODS LV echocardiographic images were recorded in systole and diastole before, during and immediately after (7-12 s) double-leg press exercise at two intensities (30% and 60% of maximum strength, one-repetition maximum). Speckle tracking analysis generated LV strain, twist, and untwisting rate data. Additionally, beat-by-beat blood pressure was recorded and systemic vascular resistance (SVR) and LV wall stress were calculated. RESULTS Responses in both exercise trials were statistically similar (P > 0.05). During effort, stroke volume decreased, whereas SVR and LV wall stress increased (P < 0.05). Immediately after effort, stroke volume returned to baseline, whereas SVR and wall stress decreased (P < 0.05). Similarly, acute exercise was accompanied by a significant decrease in systolic parameters of LV muscle mechanics (P < 0.05). However, diastolic parameters, including LV untwisting rate, were statistically unaltered (P > 0.05). Immediately after exercise, systolic LV mechanics returned to baseline levels (P < 0.05) but LV untwisting rate increased significantly (P < 0.05). CONCLUSIONS A single, acute bout of double-leg press resistance exercise transiently reduces systolic LV mechanics, but increases diastolic mechanics after exercise, suggesting that resistance exercise has a differential impact on systolic and diastolic heart muscle function. The findings may explain why acute resistance exercise has been associated with reduced stroke volume but chronic exercise training may result in increased LV volumes.
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Affiliation(s)
- Eric J Stöhr
- Discipline of Physiology & Health, Cardiff School of Sport, Cardiff Metropolitan University, Cardiff, UNITED KINGDOM
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91
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Watson AM, Coutinho C, Haraldsdottir K, Brickson S, Dunn W, Eldridge M. In-season changes in ventricular morphology and systolic function in adolescent female athletes. Eur J Sport Sci 2018; 18:534-540. [PMID: 29431592 DOI: 10.1080/17461391.2018.1435725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE To evaluate the influence of physical maturity on the changes in ventricular morphology and function with sport training in female youth athletes. METHODS Thirty-two female athletes (age 13-18 years) underwent height and weight measurement and 2-D echocardiographic evaluation immediately prior to, and following, a 20-week soccer season. Pre- and post-season left ventricular end-diastolic diameter (LVEDD), end-diastolic volume (LVEDV), ejection fraction (LVEF), stroke volume (LVSV), mass (LVM), and posterior wall thickness (LVPWT), right ventricular end-diastolic diameter (RVEDD), end-diastolic area (RVEDA), and fractional area change (RVFAC), and interventricular septal thickness (IVST) were compared. In-season change in each variable was compared across pre-season hours of vigorous physical activity (0-1, 2-3, >3 hours). RESULTS Significant increases were identified in LVEDV (51.3 ± 10.4 v 56.4 ± 9.6 ml/m2, p = 0.001) and RVEDA (10.5 ± 1.9 v 11.3 ± 2.5 cm2/m2, p = 0.040), but not LVEDD, LVM, LVPWT, LVSV, RVEDD, RVEDA, RVFAC, or IVST (p > 0.05 for all). In-season changes in echocardiographic variables did not differ across hours of pre-season vigorous physical activity (p > 0.05 for all). CONCLUSION Among female adolescent soccer players, in-season training elicits changes in resting ventricular volume, but not wall thickness or systolic function. These adaptations do not appear to be influenced by pre-season physical activity level.
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Affiliation(s)
- Andrew M Watson
- a Department of Orthopedics , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | - Carol Coutinho
- b Department of Pediatrics , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | | | - Stacey Brickson
- a Department of Orthopedics , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | - Warren Dunn
- a Department of Orthopedics , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | - Marlowe Eldridge
- c Department of Biology , University of Wisconsin , Madison , WI , USA
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92
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Influence of different dynamic sporting disciplines on right ventricular Structure and function in elite male athletes. Int J Cardiovasc Imaging 2018; 34:1067-1074. [DOI: 10.1007/s10554-018-1316-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 02/02/2018] [Indexed: 01/22/2023]
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93
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Barczuk-Falęcka M, Małek ŁA, Krysztofiak H, Roik D, Brzewski M. Cardiac Magnetic Resonance Assessment of the Structural and Functional Cardiac Adaptations to Soccer Training in School-Aged Male Children. Pediatr Cardiol 2018; 39. [PMID: 29520462 PMCID: PMC5958145 DOI: 10.1007/s00246-018-1844-5] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Physical training is associated with changes in cardiac morphology called the "athlete's heart", which has not been sufficiently studied in children. The aim of the study was to analyze cardiac adaptation to exercise in pre-adolescent soccer players. Thirty-six soccer players (mean age 10.1 ± 1.4 years) and 24 non-athlete male controls (10.4 ± 1.7 years) underwent cardiac magnetic resonance. Measurements of myocardial mass, end-diastolic and end-systolic volume, stroke volume and ejection fraction for left and right ventricle (LV, RV) were performed. Additionally, left and right atrial (LA, RA) areas and volumes were analysed. Relative wall thickness (RWT) was calculated to describe the pattern of cardiac remodeling. Interventricular wall thickness and LV mass were significantly higher in athletes, but remained within the reference (6.9 ± 0.8 vs. 6.2 ± 0.9 mm/√m2, p = 0.003 and 57.1 ± 7.4 vs. 50.0 ± 7.1 g/m2, p = 0.0006, respectively) with no changes in LV size and function between groups. The RWT tended to be higher among athletes (p = 0.09) indicating LV concentric remodeling geometry. Soccer players had significantly larger RV size (p < 0.04) with similar function and mass. Also, the LA volume (p = 0.01), LA area (p = 0.03) and LA diameter (p = 0.009) were significantly greater in players than in controls. Cardiac adaptations in pre-adolescent soccer players are characterized by an increased LV mass without any changes in LV size and systolic function, which is typical of resistance training with tendency to concentric remodeling. This is accompanied by increase of LA and RV size. It should be taken into account during annual pre-participation evaluation.
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Affiliation(s)
- Marzena Barczuk-Falęcka
- Department of Pediatric Radiology, Medical University of Warsaw, Żwirki i Wigury 63A, 02-091, Warsaw, Poland.
| | - Łukasz A. Małek
- Faculty of Rehabilitation, Józef Piłsudski University of Physical Education in Warsaw, Marymoncka 34, 00-968 Warsaw, Poland
| | - Hubert Krysztofiak
- Department of Applied Physiology, Mossakowski Medical Research Centre PAS, Pawińskiego 5, Warsaw, Poland
| | - Danuta Roik
- Department of Pediatric Radiology, Medical University of Warsaw, Żwirki i Wigury 63A, 02-091 Warsaw, Poland
| | - Michał Brzewski
- Department of Pediatric Radiology, Medical University of Warsaw, Żwirki i Wigury 63A, 02-091 Warsaw, Poland
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94
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Asif Y, Wlodek ME, Black MJ, Russell AP, Soeding PF, Wadley GD. Sustained cardiac programming by short-term juvenile exercise training in male rats. J Physiol 2017; 596:163-180. [PMID: 29143975 DOI: 10.1113/jp275339] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 11/14/2017] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Cardiac hypertrophy following endurance-training is thought to be due to hypertrophy of existing cardiomyocytes. The benefits of endurance exercise on cardiac hypertrophy are generally thought to be short-lived and regress to sedentary levels within a few weeks of stopping endurance training. We have now established that cardiomyocyte hyperplasia also plays a considerable role in cardiac growth in response to just 4 weeks of endurance exercise in juvenile (5-9 weeks of age) rats. The effect of endurance exercise on cardiomyocyte hyperplasia diminishes with age and is lost by adulthood. We have also established that the effect of juvenile exercise on heart mass is sustained into adulthood. ABSTRACT The aim of this study was to investigate if endurance training during juvenile life 'reprogrammes' the heart and leads to sustained improvements in the structure, function, and morphology of the adult heart. Male Wistar Kyoto rats were exercise trained 5 days week-1 for 4 weeks in either juvenile (5-9 weeks of age), adolescent (11-15 weeks of age) or adult life (20-24 weeks of age). Juvenile exercise training, when compared to 24-week-old sedentary rats, led to sustained increases in left ventricle (LV) mass (+18%; P < 0.05), wall thickness (+11%; P < 0.05), the longitudinal area of binucleated cardiomyocytes (P < 0.05), cardiomyocyte number (+36%; P < 0.05), and doubled the proportion of mononucleated cardiomyocytes (P < 0.05), with a less pronounced effect of exercise during adolescent life. Adult exercise training also increased LV mass (+11%; P < 0.05), wall thickness (+6%; P < 0.05) and the longitudinal area of binucleated cardiomyocytes (P < 0.05), despite no change in cardiomyocyte number or the proportion of mono- and binucleated cardiomyocytes. Resting cardiac function, LV chamber dimensions and fibrosis levels were not altered by juvenile or adult exercise training. At 9 weeks of age, juvenile exercise significantly reduced the expression of microRNA-208b, which is a known regulator of cardiac growth, but this was not sustained to 24 weeks of age. In conclusion, juvenile exercise leads to physiological cardiac hypertrophy that is sustained into adulthood long after exercise training has ceased. Furthermore, this cardiac reprogramming is largely due to a 36% increase in cardiomyocyte number, which results in an additional 20 million cardiomyocytes in adulthood.
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Affiliation(s)
- Y Asif
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
| | - M E Wlodek
- Department of Physiology, The University of Melbourne, VIC, 3010, Australia
| | - M J Black
- Department of Anatomy & Developmental Biology, Monash University, Clayton, Melbourne, VIC, 3800, Australia
| | - A P Russell
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
| | - P F Soeding
- Department of Pharmacology, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - G D Wadley
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia.,Department of Physiology, The University of Melbourne, VIC, 3010, Australia
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95
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Oláh A, Kellermayer D, Mátyás C, Németh BT, Lux Á, Szabó L, Török M, Ruppert M, Meltzer A, Sayour AA, Benke K, Hartyánszky I, Merkely B, Radovits T. Complete Reversion of Cardiac Functional Adaptation Induced by Exercise Training. Med Sci Sports Exerc 2017; 49:420-429. [PMID: 27755352 DOI: 10.1249/mss.0000000000001127] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE Long-term exercise training is associated with characteristic cardiac adaptation, termed athlete's heart. Our research group previously characterized in vivo left ventricular (LV) function of exercise-induced cardiac hypertrophy in detail in a rat model; however, the effect of detraining on LV function is still unclear. We aimed at evaluating the reversibility of functional alterations of athlete's heart after detraining. METHODS Rats (n = 16) were divided into detrained exercised (DEx) and detrained control (DCo) groups. Trained rats swam 200 min·d for 12 wk, and control rats were taken into water for 5 min·d. After the training period, both groups remained sedentary for 8 wk. We performed echocardiography at weeks 12 and 20 to investigate the development and regression of exercise-induced structural changes. LV pressure-volume analysis was performed to calculate cardiac functional parameters. LV samples were harvested for histological examination. RESULTS Echocardiography showed robust LV hypertrophy after completing the training protocol (LV mass index = 2.61 ± 0.08 DEx vs 2.04 ± 0.04 g·kg DCo, P < 0.05). This adaptation regressed after detraining (LV mass index = 2.01 ± 0.03 vs 1.97 ± 0.05 g·kg, n.s.), which was confirmed by postmortem measured heart weight and histological morphometry. After the 8-wk-long detraining period, a regression of the previously described exercise-induced cardiac functional alterations was observed (DEx vs DCo): stroke volume (SV; 144.8 ± 9.0 vs 143.9 ± 9.6 μL, P = 0.949), active relaxation (τ = 11.5 ± 0.3 vs 11.3 ± 0.4 ms, P = 0.760), contractility (preload recruitable stroke work = 69.5 ± 2.7 vs 70.9 ± 2.4 mm Hg, P = 0.709), and mechanoenergetic (mechanical efficiency = 68.7 ± 1.2 vs 69.4 ± 1.8, P = 0.742) enhancement reverted completely to control values. Myocardial stiffness remained unchanged; moreover, no fibrosis was observed after the detraining period. CONCLUSION Functional consequences of exercise-induced physiological LV hypertrophy completely regressed after 8 wk of deconditioning.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, HUNGARY
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Baggish AL, Battle RW, Beckerman JG, Bove AA, Lampert RJ, Levine BD, Link MS, Martinez MW, Molossi SM, Salerno J, Wasfy MM, Weiner RB, Emery MS. Sports Cardiology. J Am Coll Cardiol 2017; 70:1902-1918. [DOI: 10.1016/j.jacc.2017.08.055] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Accepted: 08/27/2017] [Indexed: 01/02/2023]
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97
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Dias KA, Spence AL, Sarma S, Oxborough D, Timilsina AS, Davies PS, Cain PA, Leong GM, Ingul CB, Coombes JS. Left ventricular morphology and function in adolescents: Relations to fitness and fatness. Int J Cardiol 2017; 240:313-319. [DOI: 10.1016/j.ijcard.2017.03.047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 03/06/2017] [Accepted: 03/10/2017] [Indexed: 12/19/2022]
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98
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Lundby C, Montero D, Joyner M. Biology of VO 2 max: looking under the physiology lamp. Acta Physiol (Oxf) 2017; 220:218-228. [PMID: 27888580 DOI: 10.1111/apha.12827] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/26/2016] [Accepted: 10/28/2016] [Indexed: 12/20/2022]
Abstract
In this review, we argue that several key features of maximal oxygen uptake (VO2 max) should underpin discussions about the biological and reductionist determinants of its interindividual variability: (i) training-induced increases in VO2 max are largely facilitated by expansion of red blood cell volume and an associated improvement in stroke volume, which also adapts independent of changes in red blood cell volume. These general concepts are also informed by cross-sectional studies in athletes that have very high values for VO2 max. Therefore, (ii) variations in VO2 max improvements with exercise training are also likely related to variations in these physiological determinants. (iii) All previously untrained individuals will respond to endurance exercise training in terms of improvements in VO2 max provided the stimulus exceeds a certain volume and/or intensity. Thus, genetic analysis and/or reductionist studies performed to understand or predict such variations might focus specifically on DNA variants or other molecular phenomena of relevance to these physiological pathways.
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Affiliation(s)
- C. Lundby
- Zürich Center for Integrative Human Physiology; Institute of Physiology; University of Zürich; Zürich Switzerland
| | - D. Montero
- Department of Cardiology; University Hospital Zürich; Zürich Switzerland
| | - M. Joyner
- Department of Anesthesiology; Mayo Clinic; Rochester MN USA
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99
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Shave R, Howatson G, Dickson D, Young L. Exercise-Induced Cardiac Remodeling: Lessons from Humans, Horses, and Dogs. Vet Sci 2017; 4:vetsci4010009. [PMID: 29056668 PMCID: PMC5606617 DOI: 10.3390/vetsci4010009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/20/2017] [Accepted: 01/23/2017] [Indexed: 02/06/2023] Open
Abstract
Physical activity is dependent upon the cardiovascular system adequately delivering blood to meet the metabolic and thermoregulatory demands of exercise. Animals who regularly exercise therefore require a well-adapted heart to support this delivery. The purpose of this review is to examine cardiac structure, and the potential for exercise-induced cardiac remodeling, in animals that regularly engage in strenuous activity. Specifically, we draw upon the literature that has studied the "athlete's heart" in humans, horses, and dogs, to enable the reader to compare and contrast cardiac remodeling in these three athletic species. The available literature provides compelling evidence for exercise-induced cardiac remodeling in all three species. However, more work is required to understand the influence of species/breed specific genetics and exercise-related hemodynamics, in order to fully understand the impact of exercise on cardiac structure.
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Affiliation(s)
- Rob Shave
- Cardiff Centre for Exercise and Health, Cardiff Metropolitan University, Cardiff CF23 6XD, UK.
| | - Glyn Howatson
- Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne TN1 8ST, UK.
- Water Research Group, North-West University, Potchefstroom 2520, South Africa.
| | | | - Lesley Young
- Specialist equine Cardiology Services, Moulton, Suffolk CB8 8SD, UK.
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100
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AU JASONS, OIKAWA SARAY, Morton RW, MACDONALD MAUREENJ, PHILLIPS STUARTM. Arterial Stiffness Is Reduced Regardless of Resistance Training Load in Young Men. Med Sci Sports Exerc 2017; 49:342-348. [DOI: 10.1249/mss.0000000000001106] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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