The effect of resistance training combined with timed ingestion of protein on muscle fiber size and muscle strength
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The effect of resistance training combined with timed ingestion of protein on muscle fiber size and muscle strength. / Andersen, Lars L; Tufekovic, Goran; Zebis, Mette K; Crameri, Regina M; Verlaan, George; Kjaer, Michael; Suetta, Charlotte; Magnusson, Peter; Aagaard, Per.
I: Metabolism: Clinical and Experimental, Bind 54, Nr. 2, 02.2005, s. 151-6.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The effect of resistance training combined with timed ingestion of protein on muscle fiber size and muscle strength
AU - Andersen, Lars L
AU - Tufekovic, Goran
AU - Zebis, Mette K
AU - Crameri, Regina M
AU - Verlaan, George
AU - Kjaer, Michael
AU - Suetta, Charlotte
AU - Magnusson, Peter
AU - Aagaard, Per
PY - 2005/2
Y1 - 2005/2
N2 - Acute muscle protein metabolism is modulated not only by resistance exercise but also by amino acids. However, less is known about the long-term hypertrophic effect of protein supplementation in combination with resistance training. The present study was designed to compare the effect of 14 weeks of resistance training combined with timed ingestion of isoenergetic protein vs carbohydrate supplementation on muscle fiber hypertrophy and mechanical muscle performance. Supplementation was administered before and immediately after each training bout and, in addition, in the morning on nontraining days. Muscle biopsy specimens were obtained from the vastus lateralis muscle and analyzed for muscle fiber cross-sectional area. Squat jump and countermovement jump were performed on a force platform to determine vertical jump height. Peak torque during slow (30 degrees s-1) and fast (240 degrees s-1) concentric and eccentric contractions of the knee extensor muscle was measured in an isokinetic dynamometer. After 14 weeks of resistance training, the protein group showed hypertrophy of type I (18% +/- 5%; P < .01) and type II (26% +/- 5%; P < .01) muscle fibers, whereas no change above baseline occurred in the carbohydrate group. Squat jump height increased only in the protein group, whereas countermovement jump height and peak torque during slow isokinetic muscle contraction increased similarly in both groups. In conclusion, a minor advantage of protein supplementation over carbohydrate supplementation during resistance training on mechanical muscle function was found. However, the present results may have relevance for individuals who are particularly interested in gaining muscle size.
AB - Acute muscle protein metabolism is modulated not only by resistance exercise but also by amino acids. However, less is known about the long-term hypertrophic effect of protein supplementation in combination with resistance training. The present study was designed to compare the effect of 14 weeks of resistance training combined with timed ingestion of isoenergetic protein vs carbohydrate supplementation on muscle fiber hypertrophy and mechanical muscle performance. Supplementation was administered before and immediately after each training bout and, in addition, in the morning on nontraining days. Muscle biopsy specimens were obtained from the vastus lateralis muscle and analyzed for muscle fiber cross-sectional area. Squat jump and countermovement jump were performed on a force platform to determine vertical jump height. Peak torque during slow (30 degrees s-1) and fast (240 degrees s-1) concentric and eccentric contractions of the knee extensor muscle was measured in an isokinetic dynamometer. After 14 weeks of resistance training, the protein group showed hypertrophy of type I (18% +/- 5%; P < .01) and type II (26% +/- 5%; P < .01) muscle fibers, whereas no change above baseline occurred in the carbohydrate group. Squat jump height increased only in the protein group, whereas countermovement jump height and peak torque during slow isokinetic muscle contraction increased similarly in both groups. In conclusion, a minor advantage of protein supplementation over carbohydrate supplementation during resistance training on mechanical muscle function was found. However, the present results may have relevance for individuals who are particularly interested in gaining muscle size.
KW - Adult
KW - Cell Size/drug effects
KW - Dietary Carbohydrates/pharmacology
KW - Dietary Proteins/pharmacology
KW - Dietary Supplements
KW - Eating/physiology
KW - Humans
KW - Male
KW - Muscle Contraction/drug effects
KW - Muscle Fibers, Skeletal/drug effects
KW - Muscle, Skeletal/cytology
KW - Organ Size/physiology
KW - Physical Fitness/physiology
KW - Sports/physiology
KW - Weight Lifting/physiology
U2 - 10.1016/j.metabol.2004.07.012
DO - 10.1016/j.metabol.2004.07.012
M3 - Journal article
C2 - 15690307
VL - 54
SP - 151
EP - 156
JO - Metabolism
JF - Metabolism
SN - 0026-0495
IS - 2
ER -
ID: 388034011