Sports Sciences Commons^™

Muscle Activation Differs Between Three Different Knee Joint-Angle Positions During A Maximal Isometric Back Squat Exercise, Paulo Henrique Marchetti, Josinaldo Jarbas Da Silva, Brad J. Schoenfeld, Priscyla Silva Monteiro Nardi, Silvio Luis Pecoraro, Julia Maria D'Andrea Greve, Erin Hartigan

Publications and Research

The purpose of this study was to compare muscle activation of the lower limb muscles when performing a maximal isometric back squat exercise over three different positions. Fifteen young, healthy, resistance-trained men performed an isometric back squat at three knee joint angles (20∘, 90∘, and 140∘) in a randomized, counterbalanced fashion. Surface electromyography was used to measure muscle activation of the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), semitendinosus (ST), and gluteusmaximus (GM). In general,muscle activity was the highest at 90∘ for the three quadricepsmuscles, yet differences in muscle activation between knee angles were muscle …

The Data Do Not Seem To Support A Benefit To Bcaa Supplementation During Periods Of Caloric Restriction, Brad P. Dieter, Brad Jon Schoenfeld, Alan A. Aragon

Publications and Research

J Int Soc Sports Nutr 13:1-015-0112-9, 2016 describe the efficacy of branched chain amino acid (BCAA) supplementation and resistance training for maintaining lean body mass during a calorie-restricted diet, and claim that this occurs with concurrent losses in fat mass. However, the reported results appear to be at odds with the data presented on changes in fat mass. This letter discusses the issues with the paper.

A Comparison Of Increases In Volume Load Over 8 Weeks Of Low-Versus High-Load Resistance Training, Brad J. Schoenfeld, Dan Ogborn, Bret Contreras, Tom Cappaert, Alex Silva Ribeiro, Brent A. Alvar, Andrew D. Vigotsky

Publications and Research

Background: It has been hypothesized that the ability to increase volume load (VL) via a progressive increase in the magnitude of load for a given exercise within a given repetition range could enhance the adaptive response to resistance training.

Objectives: The purpose of this study was to compare changes in volume load (VL) over eight weeks of resistance training (RT) in high-versus low-load protocols.

Materials and Methods: Eighteen well-trained men were matched according to baseline strength were randomly assigned to either a low-load RT(LOW,n= 9) where 25 - 35 repetitions were performed per exercise, or a high-load RT (HIGH,n= 9) …