Evidence of seasonal heat acclimatisation in recreationally active adults during a mild summer.

Objectives: To assess the magnitude of seasonal heat acclimatisation in recreationally active adults and contextualise the process by documenting the factors that influence adaptations.

Design: Longitudinal, repeated measures design.

Methods: Seventeen (7 females) recreationally active adults (28 ± 8 yr, V̇O 54 ± 8 mL·kg·min) exercising outdoors a minimum of 5 h·wk completed a 45-min heat response test running at 60 % V̇O in 40 °C and 30 % relative humidity prior to, midway through, and following summer.

Thermal and cardiovascular heat adaptations in active adolescents following summer.

This study aimed to investigate seasonal heat acclimatization in active adolescents following summer. Fifteen (5 females) active adolescents (14.6 ± 1.

Air speed and direction affect metabolic and thermoregulatory responses during walking and running in a temperate environment.

Revisiting classical experiments on the impact of air resistance on metabolic rate, we aimed to overcome limitations of previous research, notably: low participant numbers ( = 1-3), highly turbulent wind, and confounding effects of rising body temperature. In a custom-built wind tunnel with reduced turbulence, 14 participants (8 males, 6 females) walked (5 km·h) and ran on a treadmill (70%V̇o) at 0, 2, 4, and 6 m·s headwind or tailwind in a counterbalanced design, with rest breaks between each exposure to avoid rises in body core temperature. Oxygen consumption (V̇o) exhibited strong linear relationships versus wind direction, dynamic pressure, and air speed squared (V), lower in magnitude for headwind than tailwind.

Comparing the efficacy of different climate indices for prediction of labor loss, body temperatures, and thermal perception in a wide variety of warm and hot climates.

The purpose of this study was to investigate which climate/heat indices perform best in predicting heat-induced loss of physical work capacity (PWC). Integrating data from earlier studies, data from 982 exposures (75 conditions) exercising at a fixed cardiovascular load of 130 beats·min, in varying temperatures (15-50°C), humidities (20-80%), solar radiation (0-800 W·m), wind (0.2-3.

Biological sex does not independently influence core temperature change and sweating of children exercising in uncompensable heat stress.

The purpose of this study was to investigate the influence of biological sex, independent of differences in aerobic fitness and body fatness, on the change in gastrointestinal temperature (ΔT) and whole body sweat rate (WBSR) of children exercising under uncompensable heat stress. Seventeen boys (means ± SD; 13.7 ± 1.