This study aimed at investigating concurrent changes in cognitive control and cerebral oxygenation (Cox) during steady intense exercise to volitional exhaustion. Fifteen participants were monitored using prefrontal near-infrared spectroscopy and electromyography of the thumb muscles during the completion of an Eriksen flanker task completed either at rest (control condition) or while cycling at...

We investigated whether fatigue during prolonged exercise in uncompensable hot environments occurred at the same critical level of hyperthermia when the initial value and the rate of increase in body temperature are altered. To examine the effect of initial body temperature [esophageal temperature (Tes) = 35.9 +/- 0.2, 37.4 +/- 0. 1, or 38.2 +/- 0.1 (SE) degrees C induced by 30 min of water imm...

The purpose of this study was to examine the effects of a cooling vest on core body temperature following active dehydration and hyperthermia induced by exercising in a hot, humid environment. Based on our study, we recommend the ClimaTech HeatShield only when athletes present with mild symptoms of heat exhaustion. Fluid replacement and the prevention of heat illness have been prevalent topics ...

BACKGROUND A classic, unresolved physiological question is whether central cardiorespiratory and/or local skeletal muscle circulatory factors limit maximal aerobic capacity (VO2max) in humans. Severe heat stress drastically reduces VO2max, but the mechanisms have never been studied. METHODS AND RESULTS To determine the main contributing factor that limits VO2max with and without heat stress, ...

Heat-related illnesses can present with symptoms such as fatigue, cramps, and edema, and without intervention can progress to heat exhaustion or heat stroke. Across Canada, the number of days per year with temperatures above 30°C and nights per year with temperatures above 22°C is expected to increase owing to climate change, resulting in increased heat-related morbidity and mortality (Figure 1...

Marching band students are athletes who practice outdoors under conditions that expose them to dehydration, heat exhaustion, and sunstroke. They suffer these heat-related injuries because breaking formation frequently to adequately hydrate is impractical. This project developed educational materials alerting the students and the director to heat-related illnesses and tested a simple method of f...

OBJECTIVE To describe the work of a moorland rescue team and, in particular, the medical aspects of this work. METHODS A retrospective study of 25 years of callouts of the Dartmoor Rescue Group (DRG)-the mountain rescue team (MRT) for Dartmoor. These were analysed by cause, year, month, day of the week, and time of day. Injuries and other medical problems in casualties are described. RESULT...

The aim of this study was to determine the effects of postexercise ingestion of different-molecular-weight glucose polymer solutions on subsequent high-intensity interval-running capacity. In a repeated-measures design, 6 men ran for 60 min in the morning at 70% VO2max. Immediately post- and at 1 and 2 hr postexercise, participants consumed a 15% low-molecular-weight (LMW) or high-molecular-wei...