(09-12-07) Effect of CHO Loading Patterns on Running Performance.

Chen Y, Wong SH, Xu X, Hao X, Wong CK, Lam CW.
Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Hong Kong.
This study examined the influence of 3-day isoenergetic carbohydrate (CHO) loading with different glycemic index (GI) and glycemic load (GL) meals on running performance and metabolic responses. With a randomized crossover design, nine male runners performed a 1-h run at 70 % V.O (2max) followed by a 10-km performance run after a 3-day diet adaptation, which involved different GI and GL meals [CHO intake (%), GI, and GL per day were 73 %, 80, and 553 for the high GI and high GL (HH); 73 %, 36, and 249 for the low GI and low GL (LL); and 31 %, 79, and 227 for the high GI and low GL (HL), respectively]. There were no differences in the time to complete the 10-km run between the two high-CHO trials; however, the performance in the LL trial was improved as compared to that in the HL trial (mean +/- SEM: HH vs. LL vs. HL: 51.3 +/- 5.3 vs. 48.6 +/- 1.3 vs. 55.3 +/- 6.9 min). It appears that the amount, rather than the nature, of the CHO consumed during the 3-day isoenergetic CHO loading may be the most overriding factor on subsequent metabolism and endurance run performance.


Source: Int J Sports Med. 2007 Nov 14;

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