Hyperthermia (targeted core temperature: 38.5°C) reduces the time between gastrocnemius medialis stimulation and onset of plantar flexor force production in vivo. This reduction electromechanical delay is concomitant to an earlier motion muscle fascicle compared with thermoneutral environment. However, hyperthermia has no impact on duration transmission along aponeurosis tendon, thereby reflect...

Patellofemoral pain syndrome (PFPS) is one of the most common knee disorder seen by clinicians. The main region of pain is the lateral aspect of the patellofemoral joint. Force imbalance in the knee extensor muscles has been associated with changes in patellofemoral tracking [1] and is suspected to cause PFPS. Weakness of the vastus medialis (VM) relative to the vastus lateralis (VL) is the usu...

The purpose of this study was to investigate the effects of a single bout of whole-body vibration on isometric squat (IS) and countermovement jump (CMJ) performance. Nine moderately resistance-trained men were tested for peak force (PF) during the IS and jump height (JH) and peak power (PP) during the CMJ. Average integrated electromyography (IEMG) was measured from the vastus medialis, vastus ...

A clearly discriminable train of spikes was detected by ordinary silver disc electrodes fastened to the skin surface overlying m. vastus medialis during voluntary contraction in man. Some properties of these surface spikes were obtained. (1) Motor unit potentials detected by the inserted electrode loaded in the muscle closely under the fascia were found to be synchronized with the surface spike...

To develop an index of gait instability from electromyographic information, we made observations on infants from the time they first began to walk independently at about one year of age until around three years of age. From our findings we obtained the following criteria. (1) Very unstable gait: As seen in a child within the first month of learning to walk the vastus medialis is active in the l...

[Purpose] The aim of this study was to examine the immediate effects of neuromuscular joint facilitation (NJF) on the functional activity level after rehabilitation of anterior cruciate ligament (ACL) reconstruction. [Subjects and Methods] Ten young subjects (8 males and 2 females) who underwent ACL reconstruction were included in the study. The subjects were divided into two groups, namely, kn...

Background: Baseball pitching is a dynamic movement where the lower extremities generate and sequentially transfer energy to upper maximize ball velocity. The need for body muscular strength produce adequate push-off landing forces has been documented; however, influence footwear surface inclination on muscle activation remains unknown. Objectives: Determine how in molded cleats turf shoes from...

Proton density (PD) and diffusion tensor imaging (DTI) are techniques that enable the acquisition of data from living subjects can be used in fine-tuning subject-specific models’ architectural parameters. The aim this study was to determine vivo 3D parameters (volume, pennation angle, fiber length physiological cross-sectional area) gastrocnemius medialis, lateralis, soleus tibialis anterior mu...