Angiotensin II and endothelin-1 are potent vasoconstrictors that appear to play a role in retinal blood flow regulation. In the present study, we investigated the possible role of the angiotensin and the endothelin system in the regulation of retinal vessel diameters during isometric exercise in healthy humans. The study design was randomized, double-masked, placebo-controlled, and three-way cr...

Isometric exercise remains an important modality in patient’s rehabilitation and also employed in advanced strength and endurance training programs. The purpose of this study was to determine if the cardiovascular responses to upper limb isometric exercises differ between healthy normotensive male and female students. The study was performed on randomly selected healthy male and female subjects...

muscle fatigue assessment has been the basis of numerous studies, specifically, in neuromuscular rehabilitation and the applications of fessystems. various emgbased techniques, in time and frequency domains, have been investigatedover years for the detection and evaluationof this phenomenon. the main objective of this study has beento evaluate the efficiency of applying a number of techniques w...

LEARNING OBJECTIVES After studying this lesson the reader will be able to do the following: 1. Describe the physiological adaptations within the muscle following strength exercises 2. Provide examples of the changes that occur with neural adaptations within muscle 3. List the major contributors to improving muscle strength 4. Explain the differences among strength, power, and endurance 5. Disti...

A principal cause of subacromial impingement (SAI) is failure of the rotator cuff to center the humeral head in the glenoid during shoulder motion, counteracting the effect of the deltoid. As rehabilitation of the rotator cuff endeavors to restore balance between these muscle groups, the purpose of this companion study was to evaluate, in the symptomatic shoulders of patients with SAI, (1) the ...

In the past, the measurement of O(2) consumption ((2)) by the muscle could be carried out noninvasively by near-infrared spectroscopy from oxyhemoglobin and/or deoxyhemoglobin measurements only at rest or during steady isometric contractions. In the present study, a mathematical model is developed allowing calculation, together with steady-state levels of (2), of the kinetics of (2) readjustmen...

Methods 94 children (46 boys and 48 girls) aged 10-13 years (11.5 ±0.5), were randomly divided into 3 groups. Each group underwent a 6-week therapeutic programme aiming to correct muscles flexibility. The first group-GI (31 children) realized the programme of post isometric muscle relaxation (PIR), the second one-GII (31 children) performed static stretching with stabilization exercises, the th...

BACKGROUND Specific guidelines for therapeutic exercises following an Achilles tendon repair are lacking. HYPOTHESIS A hierarchical progression of triceps surae exercises can be determined on the basis of electromyographic (EMG) activity. STUDY DESIGN Randomized laboratory trial. METHODS Bipolar surface electrodes were applied over the medial and lateral heads of the gastrocnemius as well...

OBJECTIVE To assess whether "phasic" exercises, including rapid eye-head-neck-arm movements, can benefit patients with chronic cervical injuries. DESIGN A randomized, controlled, double blind study involving 30 chronic patients, who were allocated to either group 1 or group 2. The study period was for 8 wk. SETTING The study was conducted in a private practice. PATIENTS Thirty chronic mot...