Attenuation of Delayed Onset Muscle Soreness with Acute Consumption of Essential Amino Acids

Abstract

Introduction: Prior studies of the acute benefits of protein supplementation have determined a benefit in improving post-exercise muscle anabolism and aiding the recovery of muscle function and performance. Previous acute protein supplement studies in post-exercise protein synthesis and anabolic intracellular signaling reported no attenuation in muscle damage or elevated muscle function. The aim of this study is to implement a specific content of essential amino acids with resistance and aerobic exercises to quantify the difference in strength, endurance, and flexibility during the delayed onset muscle soreness common with a new exercise protocol. Methods: We enrolled 42 participants (22 EAA and 20 Controls) completed an hour-long aerobic and resistance exercise protocol including flexibility, resistance, and aerobic exercises for three consecutive days. The study participants were randomly assigned to the EAA (6.6g) per day (EAA + Gatorade) group or the control (Gatorade) group. The data was analyzed in a double-blinded format. Results: Both groups improved the initial flexibility respectively throughout the three exercise days but were not significantly different (p=0.32) in the sit and reach. For the resistance/power activities, the EAA group improved in the repetitions for push-ups (p=0.014 vs 0.21) and dips (0.0002 vs 0.59) compared to the controls. The EAA group was faster although not statistically significant in the 20-meter sprint and improved in the 1.5-mile run during the third day (P=0.002 vs 0.48) compared to the control group. Conclusions: The data in the results supports that acute ingestion of the essential amino acid supplements provides increased physical performance and decreases the DOMS symptoms in sedentary participants over the three-day trial period of exercise.