Carbohydrate consumption and variable-intensity exercise responses in boys and men.
Lisa M Guth1, Michael P Rogowski1, Justin P Guilkey1,2
1Human Performance Laboratory, Ball State University, Muncie, IN, 47306, USA.
European Journal of Applied Physiology
|February 11, 2019
Summary
Carbohydrate supplementation differentially affected blood glucose in boys and men during variable-intensity exercise. Most physiological and perceptual responses were not impacted by carbohydrate intake in either group.
Area of Science:
- Exercise Physiology
- Pediatric Exercise Science
- Nutritional Biochemistry
Background:
- Carbohydrate (CHO) supplementation effects on exercise responses are established for steady-state exercise in children.
- Limited research exists on CHO's impact on variable-intensity exercise (VIE) in youth and its comparison to adults.
Purpose of the Study:
- To investigate the physiological and perceptual effects of CHO supplementation during VIE in boys and men.
- To compare CHO's impact on VIE responses between adolescent boys and adult men.
Main Methods:
- Eight boys (11.1 ± 0.9 years) and 11 men (23.8 ± 2.1 years) participated.
- Participants consumed CHO or placebo (PL) beverages before and during VIE (three 12-min cycling bouts with fluctuating intensity).
- Pulmonary gas exchange and rating of perceived exertion (RPE) were assessed.
Main Results:
- CHO increased blood glucose more in men than boys, but was higher in boys versus PL later in exercise.
- Respiratory Exchange Ratio (RER) was higher with CHO in both groups; other physiological measures were unaffected.
- RPE measures (whole body, legs, chest) increased over time but were not different between groups or trials.
Conclusions:
- CHO supplementation differentially impacts blood glucose patterns during VIE in boys and men.
- Most physiological and perceptual responses to VIE were not significantly affected by CHO in either group.
- Further research is needed on glucose regulation mechanisms and CHO's performance effects during VIE in children.
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