BACKGROUND Epidemiological findings of higher muscular thigh strain injury incidence during the latter stages of soccer match play have been attributed to fatigue. HYPOTHESIS Soccer-specific fatigue will significantly reduce peak isokinetic torque of the knee flexors and extensors. STUDY DESIGN Descriptive laboratory study. METHODS Ten male professional soccer players (mean age, 24.7 +/- ...

The aim of this study was to investigate the effects of two different frequencies of whole-body vibration (WBV) training on knee extensors muscle strength in healthy young volunteers. Twenty-two eligible healthy untrained young women aged 22-31 years were allocated randomly to the 30-Hz (n=11) and 50-Hz (n=11) groups. They participated in a supervised WBV training program that consisted of 24 s...

Baptista R, Onzi E, Goulart N, Dos Santos LD, Makarewicz G, Vaz M. Effects of Concentric Versus Eccentric Strength Training on the Elderly’s Knee Extensor Structure and Function. JEPonline 2016;19(3):120-132. The purpose of this study was to compare the effects of eccentric vs. concentric 12-wk strength training program on the quadriceps properties of elderly men. Twenty-three subjects performe...

It is well documented that the ability of human muscles to develop tension is dependent on the angular velocity. In concentric actions, the decline of maximal voluntary torque, consequential to a velocity increase, has been extensively studied. The underlying mechanisms may be attributed to either or both chemical and mechanical muscle properties and/or motor unit activation by the central nerv...

Healthy untrained men performed 10 series of 12 knee eccentric extension repetitions (EE) at 160 degrees /s. The maximal voluntary isometric contraction force of the quadriceps muscle, the maximal rate of electrically induced torque development (RTD) and relaxation (RTR), isokinetic concentric torque at 30 degrees /s, the electrostimulation-induced torque at 20 and 100Hz frequencies were establ...

Background: Reliability studies are used to verify the evaluation accuracy of a given device. Strength is an important factor for development daily activities and its correct management fundamental. The objective this study was examine reliability concentric strength test in people with type 2 diabetes mellitus (T2DM). Methods: Twenty-seven individuals T2DM performed three repetitions extension...

Introduction: Muscle length can be inferred from the length-tension relationship of the muscle. This relationship is traditionally investigated by measuring the peak torque produced by the muscle and the angle at which it is generated. Objective: The present study investigated the test-retest reliability of a method for measuring hamstring active peak torque angle in healthy young adults. Metho...

Muscle force is potentiated by countermovement; this phenomenon is called stretch-shortening cycle (SSC) effect. In this study, we examined the factors strongly related to SSC effect in vivo, focusing on tendon elongation, preactivation, and residual force enhancement. Twelve healthy men participated in this study. Ankle joint angle was passively moved by a dynamometer, with a range of motion f...

OBJECTIVES The effects of Kinesio Taping (KT) on muscular performance remain largely unclear. This study aimed to investigate the acute effects of KT on the maximum concentric and eccentric quadriceps isokinetic strength. STUDY DESIGN This is a single-blinded, placebo crossover, repeated measures study. METHODS Maximum isokinetic concentric/eccentric extension torque, work, and power were a...