Heat Strain and Use of Heat Mitigation Strategies among COVID-19 Healthcare Workers Wearing Personal Protective Equipment—A Retrospective Study

The combination of an exacerbated workload and impermeable nature of the personal protective equipment (PPE) worn by COVID-19 healthcare workers increases heat strain. We aimed to compare the prevalence of heat strain symptoms before (routine care without PPE) versus during the COVID-19 pandemic (COVID-19 care with PPE), identify risk factors...

Efficiency of three cooling methods for hyperthermic military personnel linked to water availability

Purpose: Three feasible cooling methods for treatment of hyperthermic individuals in the military, that differed considerably in water volume needed (none to ~80 L), were evaluated. Methods: Ten male soldiers were cooled following exercise-induced hyperthermia (rectal temperature (Tre) ∼39.5 °C) using ventilation by fanning (1.7 m s−1),...

Ad-libitum drinking and performance during a 40-km cycling time trial in the heat

The aim of this study was to investigate if drinking ad-libitum can counteract potential negative effects of a hypohydrated start caused by fluid restriction during a 40-km time trial (TT) in the heat. Twelve trained males performed one 40-km cycling TT euhydrated (EU: no water during the TT) and two 40-km cycling TTs hypohydrated. During one...

Core temperature affects scalp skin temperature during scalp cooling

Background

Effects of radiant heat exposure on pacing pattern during a 15-km cycling time trial

The goal of this study was to investigate the effects of different durations of skin temperature manipulation on pacing patterns and performance during a 15-km cycling time trial. Nineteen well-trained men completed three 15-km cycling time trials in 18°C and 50% relative humidity with 4.5-km (short-heat), 9.0-km (long-heat) or without (control)...

The effect of pre-warming on performance during simulated firefighting exercise

This study examined the effect of active pre-warming on speed and quality of performance during simulated firefighting exercise. Twelve male firefighters performed two trials in counterbalanced order. They were either pre-warmed by 20-min cycling at 1.5 Watt kg-1 body mass (WARM) or remained thermoneutral (CON) prior to a simulated firefighting...

Pacing strategies during exercise in the heat

World Solar Challenge: warmte- en vochtbalans van de coureurs (World Solar Challenge: heat and fluid balance of the drivers).

In de warme Australische woestijn wordt jaarlijks een wedstrijd gehouden wie het snelst is met een auto op zonne-energie. De TU Delft is daarin een topper en wil ook de coureurs optimaal voorbereiden. In dit artikel wordt onderzocht hoe sterk de lichaamstemperatuur oploopt en hoeveel vocht wordt verloren tijdens een nagebootste race in de hitte....

The duration-dependent effect of skin temperature on self-pacing cycling exercise

Skin temperature has been suggested as a relevant physiological signal for the anticipatory and feedback control of work rate during self-paced exercise [1, 2]. However, a sudden extreme skin temperature elevation did not affect pacing during a 7.5-km cycling time trial [3]. Possible explanations for the discrepancy in these results are the...

Effect of warm-up and precooling on 15-km cycling performance in the heat

The effect of skin temperature on performance during a 7.5-km cycling time trial

Aerobic exercise performance is seriously compromised in the heat. Possibly, a high skin temperature causes a rating of perceived exertion (RPE)-mediated decrease in exercise intensity. The purpose of this study was to determine the effect of skin temperature on power output during a 7.5-km cycling time trial. Thirteen well-trained male subjects...

The effect of pre-heating and intermediate cooling on firefighter performance

Koude douche tijdens de marathon: een eenvoudige interventie voor een betere prestatie?

Tijdens de marathon van Eindhoven op 11 oktober 2009 er door TNO onderzoek gedaan naar een mogelijk positief effect van het koelen van hardlopers op de loopsnelheid. Het is namelijk bekend dat de efficiëntie van een hardloper afneemt als hij het warm krijgt. Kunnen koude douches dit voorkomen?