Relationship Between Aproximate Entropy and Mean Propulsive Velocity Loss During Half Squat Exercise

Abstract

Nowadays, there is an increasing interest in the study of mechanisms produced during strength training. Mean propulsive velocity loss has been widely used by trainers and sports scientists in strength training control. The aim of the present study was to analyze the relationship between mean propulsive velocity loss and approximate entropy, and to prove its validity as an indicator of strength training. Eleven trained men participated voluntarily in this study. Subjects were submitted to four series of 10 repetitions of squats exercise on the Smith machine. The intensity was 65% 1RM and 60% level of effort (LE). During experimental trails, mean propulsive velocity (MPV) and approximate entropy (ApEn) were monitoring continuously with a 1000Hz sampling frequency by WIMU PROTM inertial device (RealTrack Systems, Almeria AND, Spain). Results show that both variables (entropy and mean propulsive velocity loss) follow the same tendency, suggesting ApEn to be a potential valid method for local fatigue quantification and complexity muscular behavior during strength training.