Effects of air-perfused rucksack on physiological and perceptual strain during low-intensity exercise in a hot environment

Kajiki, Masanobu; Yamashita, Naoyuki; Itô, Ryo; Matsumoto, Takaaki

doi:10.1080/23328940.2020.1757991

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Thermal sensation (TS) was measured using a 9-point scale (0: very cold, 1: cold, 2: cool, 3: slightly cool, 4: neutral, 5: slightly warm, 6: warm, 7: hot, and 8: very hot). Thermal comfort (TC) was measured using a 7-point scale 22) (−3: very uncomfortable, −2: uncomfortable, −1: slightly uncomfortable, 0: neutral, 1: slightly comfortable, 2: comfortable, and 3: very comfortable). These perceptual indices were taken at pre 1 st half (5 and 14 min), post 1 st quarter (30 min), post 2 nd quarter (47 min), post half-time (57 min), post 3 rd quarter (72 min), and post 4 th quarter (89 min).…”

Section: Participantsmentioning

confidence: 99%

Wearing lacrosse uniform during exercise-simulated match in heat increases physiological strain index

Osakabe

Kajiki

Inada

et al. 2022

JPFSM

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Japanese collegiate and club lacrosse games are often held under environmental conditions of extreme heat in the summer. Lacrosse players are also required to wear protective equipment, which is a risk factor for heat-related illness. Nevertheless, the thermoregulatory responses of lacrosse players under such conditions are poorly understood. The present study compared the thermoregulatory responses in subjects wearing the mens' lacrosse uniform or general athletic clothes during an exercise-simulated lacrosse match played in the heat (high temperatures). Eight men performed two experimental trials of 4 × 15-min intermittent cycling exercise in the heat (35°C, 50% relative humidity). All participants performed two trials wearing a lacrosse uniform (WEAR) or general athletic clothes (CON). The physiological strain index was significantly higher (p < 0.05) in the WEAR condition than in CON, and exceeded the high risk level for heat-related illness in WEAR during the 3 rd quarter. Additionally, rectal temperature, skin temperature, heart rate, and ratings for perceived exertion, thermal sensation, and thermal comfort were significantly higher (p < 0.05) in the WEAR condition than in CON. Rectal temperature continued to increase during half-time in the WEAR condition, but not in CON (p < 0.05). These findings indicate that lacrosse players are at a higher risk of heat-related illness compared to other team sport athletes during a match because of the protective equipment worn, especially after half-time. Although further studies are required to confirm the thermoregulatory responses during an actual lacrosse match, our data will be useful in developing strategies to minimize the risk of heat-related illness.

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Section: Participantsmentioning

confidence: 99%

Wearing lacrosse uniform during exercise-simulated match in heat increases physiological strain index

Osakabe

Kajiki

Inada

et al. 2022

JPFSM

Self Cite

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“…Thermal sensation (TS) was measured using a nine-point scale (0: very cold, 1: cold, 2: cool, 3: slightly cool, 4: neutral, 5: slightly warm, 6: warm, 7: hot, and 8: very hot). Thermal comfort (TC) was measured using a seven-point scale ( − 3: very uncomfortable, − 2: uncomfortable, − 1: slightly uncomfortable, 0: neutral, 1: slightly comfortable, 2: comfortable, and 3: very comfortable) [25]. These perceptual indices were measured at pre-1 st half (14 min), post-1 st half (45 min), and post-HT (60 min) times.…”

Section: Measurementsmentioning

confidence: 99%

Effects of Half-Time Cooling Using a Fan with Skin Wetting on Thermal Response During Intermittent Cycling Exercise in the Heat

Osakabe

Kajiki

Kondo

et al. 2021

Sports Med Int Open

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The present study investigated the effects of half-time (HT) break cooling using a fan and damp sponge on physiological and perceptual responses during the 2nd half of a repeated-sprint exercise in a hot environment. Eight physically active men performed a familiarization trial and two experimental trials of a 2×30-min intermittent cycling exercise protocol with a 15-min HT break in hot conditions (35°C, 50% relative humidity). Two experimental trials were conducted in random order: skin wetting with a fan (FANwet) and no cooling (CON). During the 2nd half, a repeated-sprint cycling exercise was performed: i. e., 5 s of maximal pedaling (body weight×0.075 kp) every minute, separated by 25 s of unloaded pedaling (80 rpm) and 30 s of rest. Rectal temperature, skin temperature (chest, forearm, thigh, and calf), heart rate, physiological strain index, rating of perceived exertion, thermal sensation, and comfort were significantly improved in the FANwet condition (P<0.05). There was no significant difference in the repeated-sprint cycling exercise performance between conditions. The results suggest that skin wetting with a fan during the HT break is a practical and effective cooling strategy for mitigating physiological and perceptual strain during the 2nd half in hot conditions.

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“…Japanese researchers have investigated the efficacy of a lightweight fan-cooling device, namely an airperfused rucksack, on reducing physiological and perceptual strain. Kajiki et al [5] demonstrate that when continuous air is blown onto the back and neck from two fans attached to the sides of the rucksack, physiological and perceptual responses are reduced during light activity in the heat. Results from the Japanese Institute of Sport Sciences [6] provide an alternative cooling strategy; an ice-slurry was used during a trial simulating tennis match-play.…”

Section: Tokyo-2020ne Temperature and Time For Reflectionmentioning

confidence: 99%

Tokyo-2020ne, Temperature and time for reflection

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Effects of air-perfused rucksack on physiological and perceptual strain during low-intensity exercise in a hot environment

Cited by 5 publications

References 21 publications

Wearing lacrosse uniform during exercise-simulated match in heat increases physiological strain index

Wearing lacrosse uniform during exercise-simulated match in heat increases physiological strain index

Effects of Half-Time Cooling Using a Fan with Skin Wetting on Thermal Response During Intermittent Cycling Exercise in the Heat

Tokyo-2020ne, Temperature and time for reflection

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