Does exercise duration affect Fatmax in overweight boys?
Autor: | Melissa K. Licari, Rebecca Braham, Kym J. Guelfi, Paul A. Fournier, Nicole A. Crisp |
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Rok vydání: | 2011 |
Předmět: |
Male
medicine.medical_specialty Time Factors Sports medicine Physiology Physical Exertion Overweight Oxygen Consumption Animal science Physiology (medical) medicine Humans Orthopedics and Sports Medicine Child Exercise Exercise duration Aerobic capacity Morning business.industry Public Health Environmental and Occupational Health Absolute rate General Medicine Anthropometry medicine.disease Obesity Oxygen Adipose Tissue Physical therapy Carbohydrate Metabolism medicine.symptom business |
Zdroj: | European Journal of Applied Physiology. 112:2557-2564 |
ISSN: | 1439-6327 1439-6319 |
DOI: | 10.1007/s00421-011-2232-5 |
Popis: | To compare the assessment of Fat(max) using a single graded exercise test with 3 min stages against 30 min prolonged exercise bouts in overweight boys. Ten overweight boys (8-12 years) attended the laboratory on seven separate occasions. On the first visit, body anthropometrics and peak aerobic capacity ([Formula: see text]O(2peak)) were assessed. Following this, each participant attended the laboratory after an overnight fast for six morning cycling sessions. During the first session, participants completed a continuous, submaximal graded exercise protocol with seven 3 min stages (GRAD) at 35, 40, 45, 50, 55, 60 and 65% [Formula: see text]O(2peak). The final five visits consisted of a 30 min bout of prolonged exercise (PROL) performed in a counterbalanced order at 40, 45, 50, 55 and 60% [Formula: see text]O(2peak). There was no effect of exercise duration on Fat(max) or the absolute rate of fat oxidation during PROL (p > 0.05). At the group level, GRAD and PROL provided similar estimates of Fat(max) (GRAD: 53 ± 10% [Formula: see text]O(2peak); PROL: 53 ± 10% [Formula: see text]O(2peak); p = 0.995); however, individual variation between the two protocols is shown by a systematic bias and residual error of 0 ± 11% [Formula: see text]O(2peak). Fat oxidation rates remained stable across 30 min of steady-state exercise in overweight boys. Furthermore, Fat(max) was similar at 3, 10, 20 and 30 min of exercise, suggesting that for exercise lasting ≤ 30 min, exercise duration does not affect Fat(max). However, Fat(max) determined with GRAD may need to be interpreted with caution at the individual level given the variation in Fat(max) between protocols. |
Databáze: | OpenAIRE |
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