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Change in Core Temperature Differences Between Two Different Work/Rest Cycles.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Change in Core Temperature Differences Between Two Different Work/Rest Cycles./
Author:	Bachraty, Joseph Paul.
Description:	1 online resource (67 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
Subject:	Physiology. -
Online resource:	click for full text (PQDT)
ISBN:	9798380347228

Change in Core Temperature Differences Between Two Different Work/Rest Cycles.
Bachraty, Joseph Paul.

Change in Core Temperature Differences Between Two Different Work/Rest Cycles. - 1 online resource (67 pages)

Source: Masters Abstracts International, Volume: 85-03.

Thesis (M.S.)--State University of New York at Buffalo, 2023.

Includes bibliographical references

Labor in hot environments increases the risk of exertional heat illnesses for workers, necessitating work/rest cycles during prolonged work in the heat to mitigate dangerously high increases in core temperature. Therefore, the purpose of this study was to compare physiological responses for two work/rest cycles in a hot environment, one recommended by NIOSH and one alternate, to determine if the NIOSH guidelines for work in the heat are effective at preventing excessive heat strain and dehydration.In a randomized crossover method, Thirteen subjects (6 female, 7 male; age: 23 ± 3 y; height: 169.1 ± 8.8 cm; weight: 72.71 ± 11.44) completed two experimental trials consisting of 120 min of intermittent treadmill walking at a metabolic heat production of 453 - 480 W or "heavy work" as denoted by NIOSH, and seated rest, all in a hot environment (36.07 ± 0.74°C, 30.34 ± 1.57 % relative humidity). The trials followed work/rest cycles of either 1) 40 min work / 20 min rest [40/20] repeated twice (mirroring the NIOSH recommendations), or 2) 20 min work / 10 min rest [20/10] repeated 4 times, both working at the same work-to-rest ratio (2:1). In total, subjects completed 80 min of work and 40 min of rest in both protocols. Subjects consumed 237mL of water every 20 min in accordance with NIOSH recommendations. Oxygen consumption was measured during the first 15 min of each hour of work to confirm exercise intensity. Rectal temperature (Tre), heart rate (HR), skin temperature (Tsk), ratings perceived exertion (RPE), and fatigue were collected throughout the work protocol. Nude body mass taken before and after the work protocol was used to calculate sweat rate and percent body mass change. Comparisons were made using RMANOVA and post hoc paired t-tests. 62% (8/13) of subjects achieved a Tre of 38°C or greater in [40/20] compared to 54% (7/13) subjects in [20/10] (p = 0.58). There was no difference in maximum Tre between trials (p = 0.21) or end Tre between trials (p = 0.08). There was a difference between trials in change in Tre at 80 min compared to 60 min of work (p = 0.001) in [40/20] and no difference in [20/10] (p = 0.44) at the same time points. Change in Tre at 80 minutes of work was greater in [40/20] than [20/10] ([40/20]: +1.02 ± 0.24°C; [20/10]: + 0.92 ± 0.28°C; p = 0.04). These findings indicates that Tre was continuing to increase during [40/20] and plateauing in [20/10]. There were no differences in TSk between trials at baseline, 20, 40, 60, or 80 min of work (p = 0.38, p = 0.22, p = 0.42, p = 0.15, p = 0.44, respectively). Change in body mass ([40/20]: + 0.15 ± 0.35 kg; [20/10]: + 0.17 ± 0.22 kg; p = 0.83), percent body mass change ([40/20]: + 0.25± 0.50 %; [20/10]: + 0.18 ± 0.29 %; p = 0.62), and sweat rate ([40/20]: 0.63 ± 0.17 L/hr; [20/10]: 0.63 ± 0.11 L/hr; p = 0.86) were not different between trials. Heart rate, perceptions of fatigue, and RPE were not different between work/rest cycles (all p > 0.05).These findings indicate the NIOSH recommendations for work in the heat do not protect a majority of workers from reaching a Tre of 38°C, but do keep workers sufficiently hydrated. In addition, a longer work/rest cycle resulted in a continued increase in Tre at the end of 2 hr of work while a shorter work/rest cycle did not, indicating that shorter duration work/rest cycles may be beneficial during prolonged work, although maximum Tre was not different between groups.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380347228Subjects--Topical Terms:

673386
Physiology.
Subjects--Index Terms:

Core temperatureIndex Terms--Genre/Form:

554714
Electronic books.

Change in Core Temperature Differences Between Two Different Work/Rest Cycles.
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504 $a Includes bibliographical references
520 $a Labor in hot environments increases the risk of exertional heat illnesses for workers, necessitating work/rest cycles during prolonged work in the heat to mitigate dangerously high increases in core temperature. Therefore, the purpose of this study was to compare physiological responses for two work/rest cycles in a hot environment, one recommended by NIOSH and one alternate, to determine if the NIOSH guidelines for work in the heat are effective at preventing excessive heat strain and dehydration.In a randomized crossover method, Thirteen subjects (6 female, 7 male; age: 23 ± 3 y; height: 169.1 ± 8.8 cm; weight: 72.71 ± 11.44) completed two experimental trials consisting of 120 min of intermittent treadmill walking at a metabolic heat production of 453 - 480 W or "heavy work" as denoted by NIOSH, and seated rest, all in a hot environment (36.07 ± 0.74°C, 30.34 ± 1.57 % relative humidity). The trials followed work/rest cycles of either 1) 40 min work / 20 min rest [40/20] repeated twice (mirroring the NIOSH recommendations), or 2) 20 min work / 10 min rest [20/10] repeated 4 times, both working at the same work-to-rest ratio (2:1). In total, subjects completed 80 min of work and 40 min of rest in both protocols. Subjects consumed 237mL of water every 20 min in accordance with NIOSH recommendations. Oxygen consumption was measured during the first 15 min of each hour of work to confirm exercise intensity. Rectal temperature (Tre), heart rate (HR), skin temperature (Tsk), ratings perceived exertion (RPE), and fatigue were collected throughout the work protocol. Nude body mass taken before and after the work protocol was used to calculate sweat rate and percent body mass change. Comparisons were made using RMANOVA and post hoc paired t-tests. 62% (8/13) of subjects achieved a Tre of 38°C or greater in [40/20] compared to 54% (7/13) subjects in [20/10] (p = 0.58). There was no difference in maximum Tre between trials (p = 0.21) or end Tre between trials (p = 0.08). There was a difference between trials in change in Tre at 80 min compared to 60 min of work (p = 0.001) in [40/20] and no difference in [20/10] (p = 0.44) at the same time points. Change in Tre at 80 minutes of work was greater in [40/20] than [20/10] ([40/20]: +1.02 ± 0.24°C; [20/10]: + 0.92 ± 0.28°C; p = 0.04). These findings indicates that Tre was continuing to increase during [40/20] and plateauing in [20/10]. There were no differences in TSk between trials at baseline, 20, 40, 60, or 80 min of work (p = 0.38, p = 0.22, p = 0.42, p = 0.15, p = 0.44, respectively). Change in body mass ([40/20]: + 0.15 ± 0.35 kg; [20/10]: + 0.17 ± 0.22 kg; p = 0.83), percent body mass change ([40/20]: + 0.25± 0.50 %; [20/10]: + 0.18 ± 0.29 %; p = 0.62), and sweat rate ([40/20]: 0.63 ± 0.17 L/hr; [20/10]: 0.63 ± 0.11 L/hr; p = 0.86) were not different between trials. Heart rate, perceptions of fatigue, and RPE were not different between work/rest cycles (all p > 0.05).These findings indicate the NIOSH recommendations for work in the heat do not protect a majority of workers from reaching a Tre of 38°C, but do keep workers sufficiently hydrated. In addition, a longer work/rest cycle resulted in a continued increase in Tre at the end of 2 hr of work while a shorter work/rest cycle did not, indicating that shorter duration work/rest cycles may be beneficial during prolonged work, although maximum Tre was not different between groups.
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538 $a Mode of access: World Wide Web
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650 4 $a Physical therapy. $3 678370
653 $a Core temperature
653 $a Heat
653 $a Hot environments
653 $a Dehydration
653 $a Heat strain
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710 2 $a State University of New York at Buffalo. $b Exercise and Nutrition Sciences. $3 1475567
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