Please use this identifier to cite or link to this item: https://doi.org/10.1249/MSS.0000000000002991
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dc.titleEfficacy of Isothermic Conditioning over Military-Based Heat Acclimatization and Interval Training in Tropical Native Males
dc.contributor.authorTan, Shawn Chee Chong
dc.contributor.authorAng, Wee Hon
dc.contributor.authorLim, Louisa Si Xian
dc.contributor.authorLow, Ivan Cherh Chiet
dc.contributor.authorLee, Jason Kai Wei
dc.date.accessioned2022-11-24T03:20:29Z
dc.date.available2022-11-24T03:20:29Z
dc.date.issued2022-11-01
dc.identifier.citationTan, Shawn Chee Chong, Ang, Wee Hon, Lim, Louisa Si Xian, Low, Ivan Cherh Chiet, Lee, Jason Kai Wei (2022-11-01). Efficacy of Isothermic Conditioning over Military-Based Heat Acclimatization and Interval Training in Tropical Native Males. MEDICINE & SCIENCE IN SPORTS & EXERCISE 54 (11) : 1925-1935. ScholarBank@NUS Repository. https://doi.org/10.1249/MSS.0000000000002991
dc.identifier.issn0195-9131
dc.identifier.issn1530-0315
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/234807
dc.description.abstractPurpose: We compared the effectiveness of three field-based training programs, namely military-based heat acclimatization (MHA), isothermic conditioning (IC) and interval training (IT), in inducing physiological adaptations in tropical natives. Methods: Fifty-one untrained tropical native males (mean ± standard deviation: age, 25 ± 2 yr; body mass index, 23.6 ± 3.2 kg·m -2 ; body fat, 19% ± 5%; 2.4-km run time, 13.2 ± 0.9 min) donned the Full Battle Order attire (22 kg) and performed a treadmill route march heat stress test in an environmental chamber (dry bulb temperature, 29.9°C ± 0.5°C; relative humidity, 70% ± 3%). Heat stress tests were conducted before (PRE) and after (POST) a 2-wk training intervention consisting of either a MHA ( n = 17, 10 sessions of military-based heat acclimatization), IC ( n = 17, 10 sessions with target gastrointestinal temperature ( Tgi ) ≥ 38.5°C) or IT ( n = 17, six sessions of high-intensity interval training) program. Tgi , HR, mean weighted skin temperature ( Tsk ), physiological strain index (PSI) and thigh-predicted sweat sodium concentration ([Na + ]) were measured and analyzed by one-factor and two-factor mixed design ANOVA with a 0.05 level of significance. Results: Field-based IC induced a greater thermal stimulus than MHA ( P = 0.029) and IT ( P < 0.001) during training. Reductions in mean exercise Tgi (-0.2°C [-0.3°C, 0.0°C]; P = 0.009) , PSI (-0.4 [-0.7, -0.1]; P = 0.015) and thigh-predicted sweat [Na + ] (-9 [-13, -5 mmol·L -1 ]; P < 0.001) were observed in IC but not MHA and IT (all P > 0.05). Resting HR (MHA, -4 bpm [-7, 0 bpm]; P = 0.025; IC, -7 bpm [-10, -4 bpm]; P < 0.001; IT, -4 bpm [-8, -1 bpm]; P = 0.008) and mean exercise HR (MHA, -4 [-8, 0 bpm]; P = 0.034; IC, -11 bpm [-15, -8 bpm]; P < 0.001, IT = -5 bpm [-9, -1 bpm]; P = 0.012) were lowered in all groups after training. Isothermic conditioning elicited a greater attenuation in mean exercise HR and thigh-predicted sweat [Na + ] relative to MHA (both P < 0.05). No between-group differences were observed when comparing MHA and IT (all P > 0.05). Conclusions: Isothermic conditioning induced a more complete heat-adapted phenotype relative to MHA and IT. Interval training may serve as a time efficient alternative to MHA.
dc.language.isoen
dc.publisherLIPPINCOTT WILLIAMS & WILKINS
dc.sourceElements
dc.subjectCONTROLLED HYPERTHERMIA
dc.subjectAEROBIC CONDITIONING
dc.subjectMILITARY
dc.subjectPHYSIOLOGICAL STRAIN
dc.subjectTHERMOREGULATION
dc.typeArticle
dc.date.updated2022-11-24T01:15:37Z
dc.contributor.departmentDEAN'S OFFICE (MEDICINE)
dc.contributor.departmentDEPT OF OPHTHALMOLOGY
dc.contributor.departmentDEPT OF PHYSIOLOGY
dc.contributor.departmentPHYSIOLOGY
dc.description.doi10.1249/MSS.0000000000002991
dc.description.sourcetitleMEDICINE & SCIENCE IN SPORTS & EXERCISE
dc.description.volume54
dc.description.issue11
dc.description.page1925-1935
dc.published.statePublished
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