The effect of isometric skeletal muscle contraction on the performance of the normal left ventricle was studied noninvasively in 20 subjects. Studies were conducted at rest and at 3 minutes of isometric hanedrip exercise at 50 per cent of maximum voluntary contraction, and consisted of simultaneous recording of left ventricular echocardiogram, external carotid pulse, phonocardiogram, and electr...

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...

The purpose of the study was to highlight the acute motor reflex adaptation and to deepen functional deficits following a middle cerebral artery occlusion-reperfusion (MCAO-r). Thirty-six Sprague-Dawley rats were included in this study. The middle cerebral artery occlusion (MCAO; 120 min) was performed on 16 rats studied at 1 and 7 days, respectively (MCAO-D1 and MCAO-D7, n = 8 for each group)....

Background The involvement of nitric oxide (NO) in choroidal blood flow regulation during experimental increase of ocular perfusion pressure (OPP) has been shown in previous studies. It is also known that during isometric exercise, the inhibition of NO synthase (NOS) leads to a rightward shift of pressure-flow curves. In this study the influence of inhibited NOS on optic nerve head (ONH) blood ...

Heart transplantation does not normalize exercise capacity or the ventilatory response to exercise. We hypothesized that excessive muscle reflex activity, as assessed by the muscle sympathetic nerve activity (MSNA) response to handgrip exercise, persists after cardiac transplantation and that this mechanism is related to exercise hyperpnea in heart transplant recipients (HTRs). We determined th...

LATAR BELAKANG: Peningkatan penggunaan komputer pada era saat ini diiringi dengan peningkatan prevalensi postur tubuh yang buruk akibat posisi tetap dan tidak sesuai dalam jangka waktu lama. Hal tersebut berpotensi menyebabkan perubahan alignment seperti forward head posture. McKenzie neck exercise isometric merupakan latihan dianggap dapat membantu mempertahankan normal spinal memperbaiki tubu...

STUDY DESIGN A randomized controlled trial with single-blind outcome assessments. OBJECTIVE To evaluate the efficacy of a neck exercise program in patients with chronic neck pain. SUMMARY OF BACKGROUND DATA The effect of exercise for patients with chronic neck pain has been investigated in a number of studies. The efficacy is, however, questionable. METHODS A total of 145 patients were ra...

The purpose of this study was to examine the effect of exercise-induced damage of the elbow flexor muscles on steady motor performance during isometric, shortening, and lengthening contractions. Ten healthy individuals (age 22+/-4 yr) performed four tasks with the elbow flexor muscles: a maximum voluntary contraction, a one repetition maximum (1 RM), an isometric task at three joint angles (sho...

To test the hypothesis that a lower mean arterial pressure (MAP) response during voluntary isometric exercise in multiple sclerosis (MS) is related to a dampened muscle metabolic signal, 9 MS and 11 control subjects performed an isometric dorsiflexor contraction at 30% maximal voluntary contraction until target failure (endurance time). We made continuous and noninvasive measurements of heart r...

The study was undertaken to assess the respiratory and sympathetic cardiovascular functions in obese and non obese school children of 12-16 years age group, randomly selected from two schools of Rajpura (Punjab), representing mixed socioeconomic group of Punjabi ethnicity and categorized as obese or controls as per standard criteria for Body Mass Index (BMI). Dynamic lung function tests and pre...