Hyperproteic supplementation attenuates muscle damage after simulated Olympic cross-country mountain biking competition: a randomized case-control study

摘要

Aim: We investigated the effect of high-protein (HI-PRO - 70% protein and 30% carbohydrate) and high-carbohydrate supplementation (HI-CHO - 70% carbohydrate and 30% protein) on muscle damage, haemoglobin, immune response, perceived pain and recovery post-simulated XCO. Methods: For this,10 amateur athletes (38±9.6 yrs.) were measured pre-, post- and 24-h post-trial. Results: In comparison to the pre-trial, the post-trial athletes presented leucocytosis ( p ≤0.001; 14.7±6.1 and 13.6±5.6 cells x10 3 ; for HI-PRO and HI-CHO, respectively) and neutropenia ( p ≤0.001; 11.9±5.2 and 10.7±4.9 cells x10 3 ; for HI-PRO and HI-CHO, respectively) but recovered at 24-h post-trial (Leukocytes: 6.9±1.4 and 7.1±1.4 cells x10 3 ; for HI-PRO and HI-CHO, respectively; neutrophils: 3.6±1.2 and 3.9±1.1 cells x103; for HI-PRO and HI-CHO, respectively) without a difference between conditions ( p =0.808 and p =0.531; for leukocytes and neutrophils, respectively). A similar result was observed for perceived pain and recovery, where the condition did not interfere with these variables between the o measurement moments ( p =0.245 and p =0.491; for pain and recovery respectively). There was an interaction effect for lactate dehydrogenase (LDH), where HI-PRO presented a lower serum concentration 24-h post-trial compared to HI-CHO ( p =0.039; 181.3±21.9 and 201.0±10.4 IU/L; for HI-PRO and HI-CHO, respectively). Conclusion: HI-PRO supplementation results in better muscle damage recovery but only for LDH. Athletes should evaluate the cost-benefit of choosing the nutrients to be consumed immediately post-training or competition.