King Grub
2007-11-17, 12:11
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.
Int J Sports Med. 2007 Nov 14; Effect of CHO Loading Patterns on Running Performance.
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.
Int J Sports Med. 2007 Nov 14; Effect of CHO Loading Patterns on Running Performance.