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Research Article
Impact of Resisted Exercises and Whey Protein on Growth Hormones and Testosterone in Normal Subjects

Dalia Samir Rushdy, Ragia Mohamed Kamel, Samy Abdel Samad Nasef, Salah El-Din Basset Elsayed and Heba Mahmoud Goda

Journal of Medical Sciences, 2018, 18(1), 27-33.


Background and Objective: Protein timing is a popular dietary strategy designed to optimize the adaptive response to exercise. The strategy involves consuming protein in and around a training session in an effort to facilitate muscular repair, remodelling and thereby, enhance post-exercise strength and muscle anabolism. The purpose of the current study was to investigate the effect of whey protein (WP) on muscle performance through the evaluation of the growth and the testosterone hormones. Materials and Methods: Sixty normal subjects were selected and randomly divided into two groups. A study group took whey protein orally for 6 weeks (1.2 g kg–1/day) following exercise and control group did only resistance exercise. Resistance exercise was done for both upper limbs (biceps and triceps) using dumbbell and the initial weight was 75% of the one repetition maximum (RM). Three sets were done at 10 repetitions for each set. The training protocol consisted of three sessions/week for 6 weeks for both groups. Subjects were tested for performance before, after 3 and 6 weeks of training and blood hormone concentrations before and after 6 weeks and the comparison between the training programs were investigated. Samples were tested by t-test and two-way ANOVA. Results: Growth hormone showed significant difference between both groups (p=0.0001), while testosterone showed no significant difference between both groups (p = 0.166) at the end of the 6th week. One RM also showed significant difference in study group than control group in biceps muscle where p-value was 0.0001. Conclusion: Whey protein combined with resistance exercise has a significant difference on anabolic hormones and muscle strength at the end of the study period. These findings determined that whey protein might enhance muscle strength and anabolism.

ASCI-ID: 41-1353

Cited References Fulltext

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