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Effects of Sex, Training, and Maturity Status on the Cardiopulmonary and Muscle Deoxygenation Responses during Incremental Ramp Exercise
International Journal of Environmental Research and Public Health, Volume: 19, Issue: 12, Start page: 7410
Swansea University Authors: Adam Runacres, Kelly Mackintosh , Melitta McNarry
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DOI (Published version): 10.3390/ijerph19127410
Whilst participation in regular exercise and sport has generally increased over recent decades globally, fundamental questions remain regarding the influence of growth, maturation, and sex on the magnitude of training response throughout adolescence. Trained (108 participants, 43 girls; age: 14.3 ±...
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Whilst participation in regular exercise and sport has generally increased over recent decades globally, fundamental questions remain regarding the influence of growth, maturation, and sex on the magnitude of training response throughout adolescence. Trained (108 participants, 43 girls; age: 14.3 ± 1.8 years) and untrained (108 participants, 43 girls; age: 14.7 ± 1.7 years) adolescents completed an incremental ramp test to exhaustion during which breath by gas exchange, beat-by-beat heart rate (HR), stroke volume (SV) and cardiac output (Q̇) and muscle deoxygenation were assessed. Device-based physical activity was also assessed over seven consecutive days. Boys, irrespective of training status, had a significantly higher absolute (2.65 ± 0.70 l min−1 vs. 2.01 ± 0.45 l min−1, p < 0.01) and allometrically scaled (183.8 ± 31.4 mL·kg−b min−1 vs. 146.5 ± 28.5 mL·kg−b min−1, p < 0.01) peak oxygen uptake (V̇O2) than girls. There were no sex differences in peak HR, SV or Q̇ but boys had a higher muscle deoxygenation plateau when expressed against absolute work rate and V̇O2 (p < 0.05). Muscle deoxygenation appears to be more important in determining the sex dif-ferences in peak V̇O2 in youth. Future research should examine the effects of sex on the response to different training methodologies in youth.
Aerobic fitness; children; exercise; performance; physiology
Faculty of Science and Engineering
This work was supported by the Knowledge Economy Skills Scholarships (KESS).It is part funded by the Welsh Government’s European Social Fund (ESF) convergence programme for West Wales and the Valleys.