| Autor: |
Ijaz A; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom., Collins AJ; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom., Moreno-Cabañas A; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom.; Exercise Physiology Lab at Toledo, University of Castilla-La Mancha, Toledo, Spain., Bradshaw L; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom., Hutchins K; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom., Betts JA; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom., Podlogar T; School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom., Wallis GA; School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom., Gonzalez JT; Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom.; Department for Health, University of Bath, Bath, United Kingdom. |
| Abstrakt: |
There is little evidence that body size alters exogenous glucose oxidation rates during exercise. This study assessed whether larger people oxidize more exogenous glucose during exercise than smaller people. Fifteen cyclists were allocated into two groups based on body mass (SMALL, <70 kg body mass, n = 9, two females) or (LARGE, >70 kg body mass, n = 6) matched for lactate threshold (SMALL: 2.3 ± 0.4 W/kg, LARGE: 2.3 ± 0.3 W/kg). SMALL completed 120 min of cycling at 95% of lactate threshold1. LARGE completed two trials in a random order, one at 95% of lactate threshold1 (thereby exercising at the same relative intensity [RELATIVE]) and one at an absolute intensity matched to SMALL (ABSOLUTE). In all trials, cyclists ingested 90 g/hr of 13C-enriched glucose. Total exogenous glucose oxidation was (mean ± SD) 33 ± 8 g/hr in SMALL versus 45 ± 13 g/hr in LARGE-RELATIVE (mean difference: 13 g/hr, 95% confidence interval [2, 24] g/hr, p = .03). Large positive correlations were observed for measures of exogenous carbohydrate oxidation versus body size (body mass, height, and body surface area; e.g., body surface area vs. peak exogenous glucose oxidation, r = .85, 95% confidence interval [.51, .95], p < .01). When larger athletes reduced the intensity from RELATIVE to ABSOLUTE, total exogenous glucose oxidation was 39 ± 7 g/hr (p = .43 vs. LARGE-RELATIVE). In conclusion, the capacity for exogenous glucose oxidation is, on average, higher in larger athletes than smaller athletes during exercise. The extent to which this is due to higher absolute exercise intensity requires further research, but body size may be a consideration in tailoring sports nutrition guidelines for carbohydrate intake during exercise. |
