The goal of this study was to evaluate if isolated sarcomeres and half-sarcomeres produce a long-lasting increase in force after a stretch is imposed during activation. Single and half-sarcomeres were isolated from myofibrils using micro-needles, which were also used for force measurements. After full force development, both preparations were stretched by different magnitudes. The sarcomere len...

The observation that force production in skeletal muscle is history-dependent has been made on many occasions. For example, Abbott and Aubert (1952) demonstrated convincingly that the steady-state force following muscle shortening is smaller and following stretching is greater than the purely isometric forces at the corresponding muscle length. These phenomena have been termed force depression ...

A hand grip dynograph and weighing machine have been developed by applying the relationship 'force/area = pressure'. Force is applied to a relatively constant area provided by the partially inflated bladder taken from the compression cuff of a sphygmomanometer. Under such circumstances, the rise in pressure is proportional to the force applied, and after calibration, the pressure reading can be...

The primary aim of the study was to define the characteristics of the Force – time (F-t) and Rate of Force Development – time (RFD-t) curve of bilateral voluntary isometric muscle force of leg extensors in Serbian male fencers competing at the national and international level. The secondary aim of the study was to define the differences between the participants based on their competitive level....

The objective of the present study was to investigate the impact of muscle length during stretch-shortening cycles on static and dynamic muscle performance. Animals were randomly assigned to an isometric (control, Con, n = 12), a short-muscle-length (S-Inj, 1.22-2.09 rad, n = 12), or a long-muscle-length (L-Inj, 1.57-2.44 rad, n = 12) group. The dorsiflexor muscles were exposed in vivo to 7 set...

This study independently examined the eVects of three hydrotherapy interventions on the physiological and functional symptoms of delayed onset muscle soreness (DOMS). Strength trained males (n = 38) completed two experimental trials separated by 8 months in a randomised crossover design; one trial involved passive recovery (PAS, control), the other a speciWc hydrotherapy protocol for 72 h post-...

INTRODUCTION Populations with knee joint damage, including arthritis, have noted impairments in the regulation of submaximal muscle force. It is difficult to determine the exact cause of such impairments given the joint pathology and associated neuromuscular adaptations. Experimental pain models that have been used to isolate the effects of pain on muscle force regulation have shown impaired fo...

We investigated force enhancement following stretching in the in situ cat soleus muscle on the ascending and descending limb of the force-length relationship by varying the amount and speed of stretching and the frequency of activation (5 Hz, 30 Hz). There was a small but consistent (P<0.05) amount of force enhancement following muscle stretching on the ascending limb of the force-length relati...

Introduction: In sport movements, such as sprinting and jumping, the ability to produce explosive leg extension movements is extremely important. Values for maximal knee extension moment of force, calculated by inverse dynamics, are higher than the maximal isometric and isokinetic moments of force values obtained with tests performed on Isokinetic machines. Values of maximal knee extensor momen...

Electromyographic (EMG) amplitude and mechanical tension are directly related during isometric contraction. Maximal voluntary isometric contractions are typically elicited through two different procedures; resisting a load, which is eccentric in nature, and contracting against an immovable object, which is concentric in nature. A wealth of literature exists indicating that EMG amplitude during ...