CrossRef Declaration of Competing interests The authors declare

that they have no competing interests. Authors’ contributions EEN was responsible for developing the concept and design of the study, data collection, statistical analysis and manuscript buy PF-02341066 preparation. MJS, MLC, VAP and LKA contributed in the design of the study, data collection, and manuscript preparation. JB contributed with data analysis, statistical analysis, and manuscript preparation. All authors have read and approved the final draft of this manuscript.”
“Background Unaccustomed exercise, particularly eccentric exercise in which the muscle lengthens, is the most common method used to elicit muscle damage. Damaged muscle fibers initiate a cascade of reactions that result in a prolonged and complex interaction between protein synthesis and degradation [1]. However, while protein turnover is elevated substantially, degradation usually exceeds synthesis, and thus, protein breakdown results, leading to muscle degeneration and atrophy [2]. These changes in muscle protein ultrastructure normally result in physiological symptoms such as reductions in muscle strength,

increased muscle soreness and impaired muscle function [3, 4]. Stimulating protein synthesis and minimizing protein breakdown (proteolysis) are the two cellular processes BAY 73-4506 nmr that are essential for muscle recovery after GSK1210151A price damage [5]. While protein breakdown may be an important process involved in the adaptive response during recovery

[6], increasing protein synthetic rates within the muscle during the recovery period is vital for muscle regeneration and hypertrophy. Therefore, strategies that can promote a positive net muscle protein balance during the days following muscle injury are likely to increase the rate of protein synthesis, satellite cell proliferation, but more importantly, enhance the regenerative processes that would benefit athletes Epothilone B (EPO906, Patupilone) and others that perform strenuous/unaccustomed physical activity. Dietary proteins have an important role in regulating protein metabolism in skeletal muscle [7–9]. Whey protein isolate supplementation has been used effectively to increase muscle size and strength after resistance training [10], with some of these improvements thought to come from improved recovery from the exercise sessions. Compared to regular protein supplements, whey isolate is more effective at increasing blood amino acids and protein synthesis due to its different absorption kinetics and amino acid profile [11]. The high availability of amino acids in whey protein isolate, especially branched chain amino acids (BCAA), is important for protein synthesis in the hours immediately after ingestion. White et al. [12], examined the ingestion of a whey protein after an exercise bout which consisted of 50 maximal isokinetic eccentric quadricep contractions.