Long-term creatine supplementation improves muscular performance during resistance training in older women
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2013-04-01
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This study examined the effects of long-term creatine supplementation combined with resistance training (RT) on the one-repetition maximum (1RM) strength, motor functional performance (e.g., 30-s chair stand, arm curl, and getting up from lying on the floor tests) and body composition (e.g., fat-free mass, muscle mass, and % body fat using DEXA scans) in older women. Eighteen healthy women (64.9 ± 5.0 years) were randomly assigned in a double-blind fashion to either a creatine (CR, N = 9) or placebo (PL, N = 9) group. Both groups underwent a 12-week RT program (3 days week-1), consuming an equivalent amount of either creatine (5.0 g day-1) or placebo (maltodextrin). After 12 week, the CR group experienced a greater (P < 0.05) increase (Δ%) in training volume (+164.2), and 1RM bench press (+5.1), knee extension (+3.9) and biceps curl (+8.8) performance than the PL group. Furthermore, CR group gained significantly more fat-free mass (+3.2) and muscle mass (+2.8) and were more efficient in performing submaximal-strength functional tests than the PL group. No changes (P > 0.05) in body mass or % body fat were observed from pre- to post-test in either group. These results indicate that long-term creatine supplementation combined with RT improves the ability to perform submaximal-strength functional tasks and promotes a greater increase in maximal strength, fat-free mass and muscle mass in older women. © 2012 Springer-Verlag Berlin Heidelberg.
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Aging, Creatine, Ergogenic aid, Muscle strength, Resistance training, creatine, performance enhancing substance, age, aged, analysis of variance, body composition, Brazil, controlled clinical trial, controlled study, diet supplementation, double blind procedure, drug effect, female, human, middle aged, motor activity, muscle contraction, muscle strength, organ size, photon absorptiometry, radiography, randomized controlled trial, resistance training, sex difference, skeletal muscle, time, Absorptiometry, Photon, Age Factors, Aged, Analysis of Variance, Body Composition, Dietary Supplements, Double-Blind Method, Female, Humans, Middle Aged, Motor Activity, Muscle Contraction, Muscle Strength, Muscle, Skeletal, Organ Size, Performance-Enhancing Substances, Resistance Training, Sex Factors, Time Factors
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Inglês
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European Journal of Applied Physiology, v. 113, n. 4, p. 987-996, 2013.