IDEAS home Printed from https://ideas.repec.org/a/gam/jijerp/v21y2024i3p371-d1360257.html
   My bibliography  Save this article

Plateau in Core Temperature during Shorter but Not Longer Work/Rest Cycles in Heat

Author

Listed:
  • Joseph P. Bachraty

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

  • JianBo Qiao

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

  • Elizabeth S. Powers

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

  • Lesley W. Vandermark

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

  • J. Luke Pryor

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

  • Riana R. Pryor

    (Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA)

Abstract

This study compared physiological responses to two work/rest cycles of a 2:1 work-to-rest ratio in a hot environment. In a randomized crossover design, fourteen participants completed 120 min of walking and rest in the heat (36.3 ± 0.6 °C, 30.2 ± 4.0% relative humidity). Work/rest cycles were (1) 40 min work/20 min rest [40/20], or (2) 20 min work/10 min rest [20/10], both completing identical work. Core temperature (T c ), skin temperature (T sk ), heart rate (HR), nude body mass, and perception of work were collected. Comparisons were made between trials at equal durations of work using three-way mixed model ANOVA. T c plateaued in [20/10] during the second hour of work ( p = 0.93), while T c increased in [40/20] ( p < 0.01). There was no difference in maximum T c ([40/20]: 38.08 ± 0.35 °C, [20/10]: 37.99 ± 0.27 °C, p = 0.22) or end-of-work T sk ([40/20]: 36.1 ± 0.8 °C, [20/10]: 36.0 ± 0.7 °C, p = 0.45). End-of-work HR was greater in [40/20] (145 ± 25 b·min −1 ) compared to [20/10] (141 ± 27 b·min −1 , p = 0.04). Shorter work/rest cycles caused a plateau in T c while longer work/rest cycles resulted in a continued increase in T c throughout the work, indicating that either work structure could be used during shorter work tasks, while work greater than 2 h in duration may benefit from shorter work/rest cycles to mitigate hyperthermia.

Suggested Citation

  • Joseph P. Bachraty & JianBo Qiao & Elizabeth S. Powers & Lesley W. Vandermark & J. Luke Pryor & Riana R. Pryor, 2024. "Plateau in Core Temperature during Shorter but Not Longer Work/Rest Cycles in Heat," IJERPH, MDPI, vol. 21(3), pages 1-13, March.
    • Handle: RePEc:gam:jijerp:v:21:y:2024:i:3:p:371-:d:1360257
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1660-4601/21/3/371/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1660-4601/21/3/371/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. June T Spector & David K Bonauto & Lianne Sheppard & Tania Busch-Isaksen & Miriam Calkins & Darrin Adams & Max Lieblich & Richard A Fenske, 2016. "A Case-Crossover Study of Heat Exposure and Injury Risk in Outdoor Agricultural Workers," PLOS ONE, Public Library of Science, vol. 11(10), pages 1-16, October.
    2. Rameez Rameezdeen & Abbas Elmualim, 2017. "The Impact of Heat Waves on Occurrence and Severity of Construction Accidents," IJERPH, MDPI, vol. 14(1), pages 1-13, January.
    3. Anne M. Mulholland & Hillary A. Yoder & Jonathan E. Wingo, 2023. "Effect of Work-to-Rest Cycles on Cardiovascular Strain and Maximal Oxygen Uptake during Heat Stress," IJERPH, MDPI, vol. 20(5), pages 1-13, March.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Shinji Otani & Satomi Funaki Ishizu & Toshio Masumoto & Hiroki Amano & Youichi Kurozawa, 2021. "The Effect of Minimum and Maximum Air Temperatures in the Summer on Heat Stroke in Japan: A Time-Stratified Case-Crossover Study," IJERPH, MDPI, vol. 18(4), pages 1-12, February.
    2. Margaret C. Morrissey & Zachary Yukio Kerr & Gabrielle J. Brewer & Faton Tishukaj & Douglas J. Casa & Rebecca L. Stearns, 2023. "Analysis of Exertion-Related Injuries and Fatalities in Laborers in the United States," IJERPH, MDPI, vol. 20(3), pages 1-14, February.
    3. Junhyeong Lee & Wanhyung Lee & Won-Jun Choi & Seong-Kyu Kang & Seunghon Ham, 2019. "Association between Exposure to Extreme Temperature and Injury at the Workplace," IJERPH, MDPI, vol. 16(24), pages 1-10, December.
    4. Minsu Lee & Jaemin Jeong & Jaewook Jeong & Jaehyun Lee, 2021. "Exploring Fatalities and Injuries in Construction by Considering Thermal Comfort Using Uncertainty and Relative Importance Analysis," IJERPH, MDPI, vol. 18(11), pages 1-30, May.
    5. Elisa Stivanello & Federico Chierzi & Paolo Marzaroli & Sara Zanella & Rossella Miglio & Patrizia Biavati & Vincenza Perlangeli & Domenico Berardi & Angelo Fioritti & Paolo Pandolfi, 2020. "Mental Health Disorders and Summer Temperature-Related Mortality: A Case Crossover Study," IJERPH, MDPI, vol. 17(23), pages 1-11, December.
    6. Qianyao Pan & Daniel A Sumner & Diane C Mitchell & Marc Schenker, 2021. "Compensation incentives and heat exposure affect farm worker effort," PLOS ONE, Public Library of Science, vol. 16(11), pages 1-23, November.
    7. Robert E. Davis & Wendy M. Novicoff, 2018. "The Impact of Heat Waves on Emergency Department Admissions in Charlottesville, Virginia, U.S.A," IJERPH, MDPI, vol. 15(7), pages 1-16, July.
    8. Alana L Hansen & Susan Williams & Scott Hanson-Easey & Blesson M Varghese & Peng Bi & Jane Heyworth & Monika Nitschke & Shelley Rowett & Malcolm R Sim & Dino L Pisaniello, 2020. "Using a Qualitative Phenomenological Approach to Inform the Etiology and Prevention of Occupational Heat-Related Injuries in Australia," IJERPH, MDPI, vol. 17(3), pages 1-16, January.
    9. Chiara Di Blasi & Alessandro Marinaccio & Claudio Gariazzo & Luca Taiano & Michela Bonafede & Antonio Leva & Marco Morabito & Paola Michelozzi & Francesca K. de’ Donato & on behalf of the Worklimate C, 2023. "Effects of Temperatures and Heatwaves on Occupational Injuries in the Agricultural Sector in Italy," IJERPH, MDPI, vol. 20(4), pages 1-14, February.
    10. Kerstin K. Zander & Supriya Mathew & Stephen T. Garnett, 2018. "Exploring Heat Stress Relief Measures among the Australian Labour Force," IJERPH, MDPI, vol. 15(3), pages 1-15, February.
    11. John C. Flunker & Christopher Zuidema & Jihoon Jung & Edward Kasner & Martin Cohen & Edmund Seto & Elena Austin & June T. Spector, 2022. "Potential Impacts of Different Occupational Outdoor Heat Exposure Thresholds among Washington State Crop and Construction Workers and Implications for Other Jurisdictions," IJERPH, MDPI, vol. 19(18), pages 1-24, September.
    12. Guoshan Wu & Heqing Liu & Shixian Wu & Guanglei Liu & Caihang Liang, 2021. "Can Heart Rate Variability (HRV) Be Used as a Biomarker of Thermal Comfort for Mine Workers?," IJERPH, MDPI, vol. 18(14), pages 1-15, July.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jijerp:v:21:y:2024:i:3:p:371-:d:1360257. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.