Glycogen resynthesis in skeletal muscle following resistive exercise.
The purpose of this investigation was to determine the influence of post-exercise carbohydrate (CHO) intake on the rate of muscle glycogen resynthesis after high intensity weight resistance exercise in subjects not currently weight training. In a cross-over design, eight male subjects performed sets (mean = 8.8) of six single leg knee extensions at 70% of one repetition max until 50% of full knee extension was no longer possible. Total force application was equated between trials using a strain gauge interfaced to a computer. The subjects exercised in the fasted state. Post-exercise feedings were administered at 0 and 1 h consisting of either a 23% CHO solution (1.5 g.kg-1) or an equal volume of water (H2O). Total force production, preexercise muscle glycogen content, and degree of depletion (-40.6 and -44.3 mmol.kg-1 wet weight) were not significantly different between H2O and CHO trials. As anticipated during the initial 2-h recovery, the CHO trial had a significantly greater rate of muscle glycogen resynthesis as compared with the H2O trial. The muscle glycogen content was restored to 91% and 75% of preexercise levels when water and CHO were provided after 6 h, respectively.
Pascoe
D D
DD
Human Performance Laboratory, Ball State University, Muncie, IN 47306.
Costill
D L
DL
Fink
W J
WJ
Robergs
R A
RA
Zachwieja
J J
JJ
D000328:Adult; D000704:Analysis of Variance; D001786:Blood Glucose / Q000032:analysis; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000378:metabolism*; D015444:Exercise / Q000502:physiology*; D005943:Gluconeogenesis; D006003:Glycogen / Q000032:analysis / Q000096:biosynthesis*; D006019:Glycolysis; D006801:Humans; D007328:Insulin / Q000032:analysis / Q000097:blood; D007773:Lactates / Q000032:analysis / Q000097:blood / Q000378:metabolism; D007866:Leg / Q000502:physiology; D008297:Male; D009132:Muscles / Q000378:metabolism*; D005082:Physical Exertion / Q000502:physiology; D011897:Random Allocation; D013997:Time Factors; D014867:Water
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D007328:Insulin; D007773:Lactates; D014867:Water; D006003:Glycogen