Whey protein before and during resistance exercise has no effect on muscle mass and strength in untrained young adults
| Autor: | Darren G. Candow, Emelie Vogt, Krissy Weisgarber |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male medicine.medical_specialty Whey protein Muscle size Medicine (miscellaneous) Placebo Muscle mass Muscle Development Beverages Young Adult Animal science Bolus (medicine) Absorptiometry Photon Double-Blind Method medicine Humans Orthopedics and Sports Medicine Muscle Strength Muscle Skeletal Ultrasonography Nutrition and Dietetics Training set business.industry Resistance training Resistance Training General Medicine Diet Records Surgery Diet Sports Nutritional Physiological Phenomena medicine.anatomical_structure Whey Proteins Dietary Supplements Female Ankle business |
| Zdroj: | International journal of sport nutrition and exercise metabolism. 22(6) |
| ISSN: | 1543-2742 |
| Popis: | Purpose:To determine the effects of whey protein before and during resistance exercise (RE) on body composition and strength in young adults.Methods:Participants were randomized to ingest whey protein (PRO; 0.3 g/kg protein; n = 9, 24.58 ± 1.8 yr, 88.3 ± 17.1 kg, 172.5 ± 8.0 cm) or placebo (PLA; 0.2 g/kg cornstarch maltodextrin + 0.1 g/kg sucrose; n = 8, 23.6 ± 4.4 yr, 82.6 ± 16.1 kg, 169.4 ± 9.2 cm) during RE (3 sets of 6–10 repetitions for 9 whole-body exercises), which was performed 4 d/wk for 8 wk. PRO and PLA were mixed with water (600 ml); 50% of the solution containing 0.15 g/kg of PRO or PLA was consumed immediately before the start of exercise, and ~1.9% of the remaining solution containing ~0.006 g/kg of PRO or PLA was consumed immediately after each training set. Before and after the study, measures were taken for leantissue mass (dual-energy X-ray absorptiometry), muscle size of the elbow and knee flexors and extensors and ankle dorsiflexors and plantar flexors (ultrasound), and muscle strength (1-repetition-maximum chest press).Results:There was a significant increase (p < .05) in muscle size of the knee extensors (PRO 0.6 ± 0.4 cm, PLA 0.1 ± 0.5 cm), knee flexors (PRO 0.4 ± 0.6 cm, PLA 0.5 ± 0.7 cm) and ankle plantar flexors (PRO 0.6 ± 0.7 cm, PLA 0.8 ± 1.4 cm) and chest-press strength (PRO 16.6 ± 11.1 kg, PLA 9.1 ± 14.6 kg) over time, with no differences between groups.Conclusion:The ingestion of whey protein immediately before the start of exercise and again after each training set has no effect on muscle mass and strength in untrained young adults. |
| Databáze: | OpenAIRE |
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