Previous studies have reported women to have a greater resistance to fatigue than men during sustained handgrip exercise, however, observed gender differences in fatigue has been shown to be a function of contraction type. The purpose of the present study was to determine if gender differences exist in forearm muscle fatigue during intermittent handgrip contractions. Women [n = 11, 23.5 ± 1.5 (...

introduction: to study the effects of exercise, how important it is to choose a posture? we aimed to characterize the possible impact of different body positions on cardiovascular parameters during and after sustained isometric handgrip (ihg) exercise. materials and methods: cross sectional study was carried out in 33 young adult males (mean age: 19.21±1.083 years). we recorded blood pressure (...

We tested the hypotheses that, in humans, changes in cardiac output (CO) and total peripheral vascular resistance (TPR) occurring in response to isometric handgrip exercise vary considerably among individuals and that those individual differences are related to differences in muscle metaboreflex and arterial baroreflex function. Thirty-nine healthy subjects performed a 1-min isometric handgrip ...

1. Resting carotid baroreflex sensitivity and blood pressure responses to standardized conditions of rest and exercise were measured in 17 borderline hypertensive males and 12 normotensive males. 2. The borderline hypertensive group had significantly higher systolic and diastolic blood pressures during orthostatic rest and isometric handgrip exercise and higher systolic blood pressure during su...

In experimental settings, angiotensin II has been reported to interact with the sympathetic nervous system both centrally and peripherally. Direct evidence for this mechanism is limited in humans. We have examined the effect of AT1 receptor blockade on plasma noradrenaline during isometric handgrip exercise in healthy young volunteers. This study investigated the effects of five days pretreatme...

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...

The present study examines the efficacy of the exercise electrocardiogram using the isotonic bicycle ergometer and isometric handgrip in predicting the extent of coronary obstructive disease, coronary collaterals, and abnormalities of left ventricular contraction (asynergy) in 65 patients. Of 32 patients with a normal isotonic exercise electrocardiogram, 25 had a normal coronary arteriogram (78...

This study evaluated blood pressure and heart rate responses to exercise and nonexercise tasks as indexes of autonomic function in subjects with and without Down syndrome (DS). Twenty-four subjects (12 with and 12 without DS) completed maximal treadmill exercise, isometric handgrip (30% of maximum), and cold pressor tests, with heart rate and blood pressure measurements. Maximal heart rate and ...

We used M-mode echocardiography to measure left ventricular dimensions in diastole (Dd) and systole (Ds) and to assess ventricular performance by computing the percent dimensional shortening (%AD) and the normalized rate of dimensional shortening (Vd) during isometric and isotonic exercise in normal subjects. In 27 subjects, isometric handgrip exercise at 50% of maximum grip until fatigue produ...