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Using Predictive Modeling Technique to Assess Core Temperature Adaptations from Heart Rate, Sweat Rate, and Thermal Sensation in Heat Acclimatization and Heat Acclimation

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  • Yasuki Sekiguchi

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA
    Sports Performance Laboratory, Department of Kinesiology and Sport Management, Texas Tech University, 3204 Main Street, Lubbock, TX 79409, USA)

  • Courteney L. Benjamin

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA
    Department of Kinesiology, Samford University, Birmingham, AL 35229, USA)

  • Ciara N. Manning

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Cody R. Butler

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Michael R. Szymanski

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Erica M. Filep

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA
    Department of Kinesiology and Military Science, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA)

  • Rebecca L. Stearns

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Lindsay J. Distefano

    (Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Elaine C. Lee

    (Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

  • Douglas J. Casa

    (Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA)

Abstract

Assessing the adaptation of rectal temperature (T rec ) is critical following heat acclimatization (HAz) and heat acclimation (HA) because it is associated with exercise performance and safety; however, more feasible and valid methods need to be identified. The purpose of this study was to predict adaptations in T rec from heart rate (HR), sweat rate (SR), and thermal sensation (TS) using predictive modeling techniques. Twenty-five male endurance athletes (age, 36 ± 12 y; VO 2max , 57.5 ± 7.0 mL⋅kg −1 ⋅min −1 ) completed three trials consisting of 60 min running at 59.3 ± 1.7% vVO 2max in a hot environment. During trials, the highest HR and TS, SR, and T rec at the end of trials were recorded. Following a baseline trial, participants performed HAz followed by a post-HAz trial and then completed five days HA, followed by a post-HA trial. A decision tree indicated cut-points of HR (<−13 bpm), SR (>0.3 L·h −1 ), and TS (≤−0.5) to predict lower T rec . When two or three variables met cut-points, the probability of accuracy of showing lower T rec was 95.7%. Greater adaptations in T rec were observed when two or three variables met cut-points (−0.71 ± 0.50 °C) compared to one (−0.13 ± 0.36 °C, p < 0.001) or zero (0.0 3 ± 0.38 °C, p < 0.001). Specificity was 0.96 when two or three variables met cut-points to predict lower T rec . These results suggest using heart rate, sweat rate, and thermal sensation adaptations to indicate that the adaptations in T rec is beneficial following heat adaptations, especially in field settings, as a practical and noninvasive method.

Suggested Citation

  • Yasuki Sekiguchi & Courteney L. Benjamin & Ciara N. Manning & Cody R. Butler & Michael R. Szymanski & Erica M. Filep & Rebecca L. Stearns & Lindsay J. Distefano & Elaine C. Lee & Douglas J. Casa, 2022. "Using Predictive Modeling Technique to Assess Core Temperature Adaptations from Heart Rate, Sweat Rate, and Thermal Sensation in Heat Acclimatization and Heat Acclimation," IJERPH, MDPI, vol. 19(20), pages 1-9, October.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:20:p:13009-:d:938695
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    References listed on IDEAS

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    1. Yasuki Sekiguchi & Courteney L. Benjamin & Elaine C. Lee & Jeb F. Struder & Ciara N. Manning & Margaret C. Morrissey & Michael R. Szymanski & Rebecca L. Stearns & Lawrence E. Armstrong & Douglas J. Ca, 2022. "Effects of Heat Acclimation Following Heat Acclimatization on Whole Body Heat Exchange in Trained Endurance Athletes," IJERPH, MDPI, vol. 19(11), pages 1-11, May.
    2. Courteney L. Benjamin & Yasuki Sekiguchi & Jeb F. Struder & Michael R. Szymanski & Ciara N. Manning & Andrew J. Grundstein & Elaine C. Lee & Robert A. Huggins & Lawrence E. Armstrong & Douglas J. Casa, 2021. "Heat Acclimation Following Heat Acclimatization Elicits Additional Physiological Improvements in Male Endurance Athletes," IJERPH, MDPI, vol. 18(8), pages 1-12, April.
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    Cited by:

    1. Ciara N. Manning & Courteney L. Benjamin & Yasuki Sekiguchi & Cody R. Butler & Michael R. Szymanski & Rebecca L. Stearns & Lawrence E. Armstrong & Elaine C. Lee & Douglas J. Casa, 2023. "Environmental Stress Symptoms during Heat Acclimatization, Heat Acclimation, and Intermittent Heat Training," IJERPH, MDPI, vol. 20(4), pages 1-12, February.

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    1. Ciara N. Manning & Courteney L. Benjamin & Yasuki Sekiguchi & Cody R. Butler & Michael R. Szymanski & Rebecca L. Stearns & Lawrence E. Armstrong & Elaine C. Lee & Douglas J. Casa, 2023. "Environmental Stress Symptoms during Heat Acclimatization, Heat Acclimation, and Intermittent Heat Training," IJERPH, MDPI, vol. 20(4), pages 1-12, February.

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