The effects of whey protein supplementation on body composition and physical performance tests in men
Pelin Bilgi April 2014 The FASEB Journal vol. 28 no. 1 Supplement 381.2
The purpose of this study was to determine the effects of whey protein supplements on total and regional body compositions and physical performance tests in response to 10 weeks of resistance training.
Twenty-four men aged 18-32 years, mean age 23 ± 3.4 years, were randomly divided into Protein (P) group, with whey protein supplementation (70 g/day on training days and 35 g/day on non-training days) or Control (C) group, without supplementation.
Daily mean total protein intakes of P and C groups were 118.2 ± 27.3 g (2.25 ± 0.26 g / kg BW) and 66.3 ± 15.0 g (1.16 ± 0.26g /kg BW), respectively (p < 0.001).
All subjects trained 3 days/week for 10 weeks. At 0 and 10th weeks, subjects underwent bioelectrical impedance for total and regional body composition measurements and physical performance tests; i.e., one repetition maximum (1RM) strength, hand grip, and wall sit time tests. Data were analyzed using repeated measures ANOVA and presented as mean ±SD changes from baseline. No significant group x time interaction effects were observed among groups in changes in any variable.
A significant time effect was observed for lean mass (P:2.3 ± 3.6 kg; C:0.8 ± 0.9 kg), mid-upper arm area (P:8.0 ± 5.5 cm2; C:0.9 ± 2.5 cm2), bench press 1RM (P:18.5 ± 7.5 kg; C:11.4 ± 6.7 kg), wall sit time test (P:5.9 ± 18.4 sec; C:20.5 ± 31.2 sec), and handgrip test (P:4.9 ± 3.8; C:2.5 ± 2.2,) (all, p < 0.001).
During resistance training, daily supplementation with whey protein was effective for promoting gains in lean mass and muscle strength.