Effects of protein supplementation in fitness world: A 12-week cross-over studio


  • Giuseppe Messina University of Palermo, Italy
  • Alessandra Amato University of Palermo, Italy
  • Giuseppe D'amico University of Palermo, Italy
  • Sara Baldassano University of Palermo, Italy
  • Patrizia Proia University of Palermo, Italy




Training, Supplementation, Body composition, Neuromuscular strength, Hypertrophy


The aim of this project was to evaluate the effect of isolated protein supplementation in young amateur athletes. Sixteen subjects aged between 20 and 30 were recruited for this study. Before to start sports performance was assessed at T0, in all subjects, using physical performance test and evaluated body composition. Therefore, the subjects were randomly assigned in two groups (group A and B) of 8 subjects each. The group A start to intake 30 g of protein powder diluted in water after each training session (3 times a week) for six weeks (T0) whilst the group B was the placebo. After 6 weeks (T1), the measurement were repeated for all subjects and the group A became placebo and the group B started with the supplementation. At the end of 6 weeks (T2) we carried out all the tests were performed again. Results showed a significant improvement in almost all tests between T0 and T2 within the same group (p < .05), but not significant difference was found between the start and the end of protein’s intake period in both groups. In conclusion, supplementation did not have affect the performance and body composition significantly. Instead, training seems to influence the performance more the supplementation.




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How to Cite

Messina, G., Amato, A., D’amico, G., Baldassano, S., & Proia, P. (2020). Effects of protein supplementation in fitness world: A 12-week cross-over studio. Journal of Human Sport and Exercise, 15(2proc), S308-S314. https://doi.org/10.14198/jhse.2020.15.Proc2.22

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