BACKGROUND Retrospective and cross-sectional data suggest that vigorous exertion can trigger cardiac arrest or sudden death and that habitual exercise may diminish this risk. However, the role of physical activity in precipitating or preventing sudden death has not been assessed prospectively in a large number of subjects. METHODS We used a prospective, nested case-crossover design within the...

BACKGROUND The acute blood pressure response to physical exertion has been used as an indicator of the risk of developing hypertension. The factors associated with this response need to be clarified for timely intervention in preventing hypertensive disease. OBJECTIVE To describe the response of cardiovascular variables to acute physical exertion in overweight adolescents using cardiopulmonar...

Research was conducted to determine if a relation exists between human exertion and the ability of speech recognition software to correctly recognize human speech. Participants were asked to use voice recognition technology to input a short newspaper article in 3 portions. 1 portion of the selected article was read while the participants were rested, another portion while they were lightly exer...

The purpose of this paper is to investigate new fusiform muscle models. Each of these models treats a muscle as a system composed of parts characterized by different mechanical properties. These models explain the influence of differences in the stiffness of lateral parts and the degree of muscle model discretization. Each muscle model is described by a system of differential equations and a si...

This study assessed the nature of the perceived exertion response to treadmill running in 14 healthy 7-8 year-old children, using the Eston-Parfitt (E-P) Ratings of Perceived Exertion (RPE) scale and a marble dropping task. For the E-P scale and the marble dropping task, the relationships between the RPE and work rate were best described as linear (R2 = .96) and curvilinear (R2 = .94), respecti...

The ratings of perceived exertion are a widely accepted measure of quantifying, monitoring and regulating exercise intensity. A critical review of the perceived exertion literature since 2000 provides a useful insight into the concepts and themes that have featured prominently in the literature. In this regard, five main themes of enquiry concerning perceived exertion have emerged. These includ...