intruduction: pattellofemoral pain syndrome (p.f.p.s) is the most common problem in knee joint. various authors have indicated that imbalance of muscle activity between vastus medialis oblique (vmo) and vastus lateralis (vl) might lead to p.f.p.s. the objective is to determine the effect of patellar taping on vmo/vl myoelectric activity ratio during maximal isometric contraction in open and clo...

Previous isolated muscle studies examining the effects of ageing on contractility have used isometric protocols, which have been shown to have poor relevance to dynamic muscle performance in vivo. The present study uniquely uses the work-loop technique for a more realistic estimation of in vivo muscle function to examine changes in mammalian skeletal muscle mechanical properties with age. Measu...

INTRODUCTION Losses in muscle mass and strength may affect an astronaut's safety; therefore, it is of utmost importance to optimize countermeasures to minimize atrophy and strength loss during spaceflight. The main purpose of this study was to determine if high force eccentric or isometric contractions performed by the plantar flexor group during hind limb suspension would preserve muscle mass ...

BACKGROUND Deficits in strength, power and balance represent important intrinsic risk factors for falls in seniors. OBJECTIVE The purpose of this study was to investigate the relationship between variables of lower extremity muscle strength/power and balance, assessed under various task conditions. METHODS Twenty-four healthy and physically active older adults (mean age: 70 ± 5 years) were ...

Purpose: The present study aimed to investigate the effect of voluntary and electrically stimulated quadriceps muscle fatigue on postural control. Methods: Sixteen healthy young males participated in this quasi-experimental study. All subjects performed two fatiguing exercises with equal intensity of isometric maximal voluntary contraction: Voluntary (VOL) and Electrical Stimulation (ES). The ...

BACKGROUND/AIM Traumas and war injuries, next to chronic occlusive artery disease and diabetes mellitus-derived complications, are the most frequent cause of the lower limbs amputation. They affect mostly younger population that need a higher level of activities as compared with the elderly. Medical rehabilitation is very significant for the muscle performance improvement in this population pro...

OBJECTIVE It is not known which laboratory indices of muscle mass, strength or quality can distinguish functional performance in healthy middle aged women. The aim of this study was to (a) examine the association between upper leg lean tissue mass, knee extensor strength, muscle quality (strength per unit lean tissue mass) and functional performance and (b) to determine the utility of tertiles ...

The decline in isometric force, swelling of sarcoplasmic reticulum and loss of desmin was measured in semimembranosus lateralis muscle of male Wistar rats immediately after a short series of brief (500 ms) maximal isometric contractions. For the active muscle, the series ended below (protocol A) and just over muscle optimum length (protocol AA). In one protocol, the muscle remained passive and ...

BACKGROUND AND AIMS The aim of this study was to assess the effects of risk-based multifactorial fall prevention program on maximal isometric strength in the community-dwelling aged. METHODS 591 subjects were randomized in two age groups (65-74 and > or = 75 yrs), intervention group (IG) (n=293) and control group (CG) (n=298). A 12-month program consisted of individual geriatric assessment, i...

Muscle strength and volume vary greatly among individuals. Maximum isometric joint moment, a standard measurement of strength, has typically been assessed in young, healthy subjects, whereas muscle volumes have generally been measured in cadavers. This has made it difficult to characterize the relationship between isometric strength and muscle size in humans. We measured maximum isometric momen...