The Effect of Bcaa on Isometric Force Following Endurance Exercise in a Hot Environment

Abstract

Introduction: Fatigue due to endurance exercise results from both peripheral and central changes, and may influence subsequent performance during a strength task. The increase in serotonin concentration is one of the central factors associated with endurance exercise-induced fatigue, particularly in hot environments. A nutritional strategy employed to reduce serotonergic activation is supplementation with branched-chain amino acids (BCAA). Objective: To investigate whether BCAA supplementation attenuates the reduction in isometric force caused by prior endurance exercise in a hot environment. Methods: Nine volunteers (aged 25.4 ± 1.2 years) performed a 2-min maximal voluntary isometric contraction (MVCISO) of upper limb muscles before and after an endurance exercise on a cycle ergometer at 40% of the maximal aerobic power. The volunteers underwent three experimental trials: 1) endurance exercise in a temperate environment (23°C and 60% RH); exercise in a hot environment (35°C and 60% RH) with the ingestion of: 2) a placebo solution or 3) a solution containing BCAA 30 mg.kg−1. During the MVCISO test, the isometric force of flexor muscles of the right elbow, core body temperature (TCORE) and heart rate (HR) were measured. Results: Isometric force decreased following endurance exercise in the hot environment, and BCAA administration did not attenuate this reduction. Greater TCORE and HR values were observed following endurance exercise in the heat, compared to pre-exercise values, and supplementation did not interfere with these physiological responses. Conclusion: The reduction in isometric force, caused by previous endurance exercise in a hot environment, was not diminished by supplementation with BCAA. Level of evidence I; Type of study: Therapeutic studies - Investigation of treatment outcomes.

Protective Effect of Amino Acids on the Muscle Injury of Aerobics Athletes after Endurance Exercise Based on CT Images

“…According to the VAS pain [ 18 ] score table, the degree of muscle injury of each athlete is counted, as shown, as shown in Figure 8 .…”

Predicting the body core temperature of recreational athletes at the end of a 10 km self‐paced run under environmental heat stress

“…Regarding physical performance, T core has direct and indirect effects that limit the ability to exercise for prolonged periods (Cheung & Sleivert, 2004 ). For example, increased T core , possibly brain temperature, changes EEG activity (Nybo & Nielsen, 2001b ), increases perceived exertion (Nybo & Nielsen, 2001b ) and reduces the central drive for muscle contractions (Moraes et al., 2019 ; Nybo & Nielsen, 2001a ). Concerning the health of athletes, severe hyperthermia has been associated with impaired intestinal function (Pals et al., 1997 ; Pires et al., 2018 ), endotoxaemia (Gisolfi, 2000 ) and a higher incidence of heat stroke, the most severe heat illness (Armstrong et al., 2007 ).…”

Mechanisms of Physical Fatigue and its Applications in Nutritional Interventions

“…The effect of BCAAs on physical performance has been also tested in humans and results are quite paradoxical. Some studies have shown that BCAAs’ supplementation can reduce muscle damage and improve performance, ,, whereas other studies argued that the beneficial effect of BCAAs on physical exercise has not been observed in terms of muscle damage indices and performance . These controversial findings in human studies maybe attributed to the amount and duration of BCAA supplementation.…”

“…Some studies have shown that BCAAs' supplementation can reduce muscle damage and improve performance, 53,55,56 whereas other studies argued that the beneficial effect of BCAAs on physical exercise has not been observed in terms of muscle damage indices and performance. 57 These controversial findings in human studies maybe attributed to the amount and duration of BCAA supplementation. This speculation is supported by a systematic review by Fouréand Bendahan, 58 which suggests that BCAA supplementation could be effective to ameliorate exercise-induced muscle damage if BCAA is given at least 1 week before the exercise for longer than 10 days at a daily dose of 200 mg/kg above.…”