Effect of glycemic index meals on recovery and subsequent endurance capacity.
This study examined the effect of ingesting a high or low glycemic index (GI) meal during a short-term recovery period on endurance running capacity. On two occasions, seven men (age 30.0+/-2.6 yr, body mass 60.7+/-1.4 kg, VO (2max) 62.1+/-2.2 ml.kg (-1).min (-1)) ran at 70% VO (2max) on a level treadmill for 90 min (R1), followed by a 4 h recovery (REC) and a further exhaustive run at the same speed (R2). Twenty minutes after R1, each subject consumed an isoenergetic meal containing either high GI (HGI, GI=77) or low GI (LGI, GI=37) carbohydrate providing 1.5 g CHO.kg (-1) BM. During REC, subjects also ingested a prescribed volume of water equal to 150% of their BM loss during R1. The duration of R2 in the HGI trial was 15% longer than in the LGI trial (HGI: 86.6+/-10.7 min vs. LGI: 75.2+/-8.1 min, p<0.05). The subjects also achieved complete rehydration after REC on both occasions. In conclusion, the consumption of a HGI meal during a 4 h recovery improved endurance capacity in a subsequent run; however, the precise mechanism(s) by which this takes place is yet to be clarified.
Wong
S H
SH
The Chinese University of Hong Kong, Department of Sports Science and Physical Education, Hong Kong.
Chen
Y J
YJ
Fung
W M
WM
Morris
J G
JG
D000328:Adult; D056352:Athletes; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004326:Drinking; D005080:Exercise Test; D005440:Fluid Therapy / Q000379:methods; D038321:Glycemic Index; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000502:physiology*; D019518:Postprandial Period; D012420:Running / Q000502:physiology*; D016037:Single-Blind Method; D013997:Time Factors
D004040:Dietary Carbohydrates