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Vol. 84, Issue 3, 890-896, March 1998
Departments of Kinesiology, Neurology, and Physical Medicine and Rehabilitation, McMaster University, Hamilton, Ontario, Canada L8S 4K1
The provision of additional protein (Pro)
to a carbohydrate (CHO) supplement resulted in an enhanced rate of
muscle glycogen resynthesis after endurance exercise (Zawadzki et al.,
J. Appl. Physiol. 72: 1854-1859,
1992). A comparison of isoenergetic CHO and CHO/Pro formula drinks on
muscle glycogen resynthesis has not been examined after either
endurance or resistance exercise. We studied the effect of isoenergetic
CHO (1 g/kg) and CHO/Pro/fat (66% CHO, 23% Pro, 11% fat) defined
formula drinks and placebo (Pl) given immediately
(t = 0 h) and 1 h
(t = +1 h) after resistance exercise
in 10 healthy young men. They performed a whole body workout (9 exercises/3 sets at 80% 1 repetition maximum) with unilateral knee
extension exercise [exercise (Ex) and control (Con) leg].
The CHO/Pro/fat and CHO trials resulted in significantly greater
(P < 0.05) plasma insulin and
glucose concentration compared with Pl. Muscle glycogen was
significantly lower (P < 0.05) for the Ex vs. Con leg immediately postexercise for all three conditions. The rate of glycogen resynthesis was significantly greater
(P < 0.05) for both CHO/Pro/fat and
CHO (23.0 ± 4.5 and 19.3 ± 6.1 mmol · kg dry
muscle
1 · h1,
respectively) vs. Pl (Ex = 2.8 ± 2.3 and Con = 1.4 ± 3.6 mmol · kg dry
muscle1 · h1).
These results demonstrated that a bout of resistance exercise resulted
in a significant decrease in muscle glycogen and that consumption of an
isoenergetic CHO or CHO/Pro/fat formula drink resulted in similar rates
of muscle glycogen resynthesis after resistance exercise. This suggests
that total energy content and CHO content are important in the
resynthesis of muscle glycogen.
carbohydrate supplement; protein supplement; strength exercise
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