Wheelchair-mounted accelerometers for measurement of physical activity.

Purpose: To evaluate the validity of a wheelchair frame-mounted accelerometer for the assessment of physical activity of wheelchair users.

Method: Twelve collegiate wheelchair basketball players participated in this study. The study was conducted in a modern indoor gymnasium at a university in the USA.

Effects of caffeine on repetitions to failure and ratings of perceived exertion during resistance training.

Context: Ergogenic effects of caffeine on aerobic or endurance exercise are well documented. Conversely, the ergogenic value of caffeine on high-intensity, primarily anaerobic performance is not well understood even though the proposed mechanisms of action for caffeine permit a strong theoretical basis for application to this type of exercise.

Purpose: This study examined effects of caffeine (Ca) on number repetitions (reps), ratings of perceived exertion (RPE), and peak heart rate (PHR) during resistance-training exercise with reps performed to volitional failure.