BACKGROUND AND PURPOSE Unaccustomed strenuous physical exertion can trigger myocardial infarction, but little is known about the mechanisms precipitating subarachnoid hemorrhage (SAH). METHODS We identified all cases of first-ever SAH among the combined populations (2.8 million) of 4 urban centers in Australia and New Zealand. Information on the type, time, and intensity of exposures in the 2...

This study investigated the effect of different repetition durations on ratings of perceived exertion (RPE) in active muscles (RPE-AM) and the overall body (RPE-O). 19 male volunteers (M age = 25.4 yr., SD = 3.5) performed strength training protocols with multiple sets matched by the number of sets and repetitions, intensity and rest interval but different repetition durations: 4 sec., 6 sec., ...

PURPOSE There are no data for factors that could trigger myocardial infarction (MI) in the context of lifestyles in developing countries. METHODS Using a case-crossover design, we assessed the effect of heavy physical exertion, sexual activity, acute respiratory tract infections, and gastroenteritis as triggers for MI in 530 survivors of a first MI from Costa Rica. RESULTS Relative risks (R...

OBJECTIVE The objective was to determine if visual estimation of effort (VEE) during lifting tasks is accurate in classifying relative levels of exertion or distinguishing between incomplete lifts that may be potentially unsafe and incomplete lifts of "actors" feigning weakness. PARTICIPANTS A convenience sample of 117 health professionals and lay subjects participated in the study. METHODS...

Thirty subjects drove screws into perforated sheet metal mounted on a horizontal surface using three air-powered tools that varied in shape (right-angle, in-line, and pistol-shaped). The four horizontal work locations ranged from 13-88 cm in front of the body and were placed at 25 cm intervals. The vertical placement of the horizontal beam was at midthigh, elbow, and midchest height. Subjects d...

This study was conducted to determine the predictive ability of rated perceived exertion (WE) of mentally retarded (MR) young adults with respect to heart rate (HR) and workload (WL). Subjects were a group of 10 mentally retarded adults (M age = 21.20 yrs, M IQ = 50.5) and a control group of 10 nonretarded adults (M age = 21.18 yrs). The procedure involved the performance of a continuous multis...

OBJECTIVES To investigate the immediate effects of Nordic pole walking (NPW) on walking distance and cardiopulmonary workload in patients with intermittent claudication. METHODS Using a standardised treadmill test (3.2 km h(-1) at 4% gradient), walking distance, cardiopulmonary responses, leg pain and perceived exertion during NPW were compared to responses evoked by normal walking in 20 pati...

Seven Standardbred horses were exercised on a treadmill at speeds (approximately 12 m/s) producing maximal heart rate, hypoxemia, and a mean pulmonary arterial pressure of approximately 75 mmHg. Extravascular lung water was measured by using transients in temperature and electrical impedance of the blood caused by a bolus injection of cold saline solution. Lung water was approximately 3 ml/kg b...

OBJECTIVE The aim of this study was to measure lower extremity isometric strength in patients with juvenile idiopathic arthritis (JIA) and to evaluate the usefulness of an adjustable dynamometer chair in the clinical work. METHODS Twenty-five children with JIA and 25 healthy, age-matched controls, aged 7-12 (mean age 10.1) were studied. The isometric maximal strength of knee and ankle muscles...

AIMS To identify distinct trajectories of fatigue over a 12-month period and to examine their impact on mortality in chronic heart failure (CHF). METHODS AND RESULTS Consecutive CHF patients (n = 310) were assessed at baseline and at 2- and 12-month follow-up for symptoms of exertion and general fatigue. Latent growth mixture modelling was used to examine the course of fatigue over time. The ...