Impact Of Prior Heat Stress On Subsequent Aerobic Exercise Performance

Kenefick, Robert W.; Palombo, Laura J.; Ely, Brett R.; Goodman, Daniel A.; Cheuvront, Samuel N.; Sawka, Michael N.

doi:10.1249/01.mss.0000355595.24932.63

Cited by 3 publications

(4 citation statements)

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“…Using the ITS in this manner would allow for its immediate utilization without concern that fluid ingestion could contaminate T c measurements. Some investigations have already started using ITS as such (Kenefick et al 2009, Ely et al 2010. However, whether this procedure is valid remains to be demonstrated.…”

Section: Discussionmentioning

confidence: 99%

Intestinal temperature does not reflect rectal temperature during prolonged, intense running with cold fluid ingestion

et al. 2015

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It is generally assumed that intestinal temperature (Tint), as measured with a telemetric pill, agrees relatively well with rectal temperature (Trec) during exercise. However, whether Tint reflects Trec during prolonged, intense and continuous exercise when cold fluids are consumed is unknown. Therefore, we compared Trec and Tint during a half-marathon during which cold water was ingested to prevent bodyweight (BW) losses >2%. Nine endurance athletes (age 30 ± 5 years) underwent a 21.1 km running time-trial (TT) in the heat (~30 °C and 44% RH) while BW losses were maintained to ~1% with continuous cold (4 °C) water provision. Tint and Trec were monitored throughout the TT. Hypohydration level, TT time and fluid intake were 1.2 ± 0.4% BW, 93.2 ± 9.9 min and 2143 ± 264 ml, respectively. Trec was systematically higher than Tint by 0.25 °C (95% CI: 0.14-0.37 °C). Tint and Trec showed an excellent relative (r = 0.90, p < 0.01), but poor absolute agreement as reflected by a 95% limit of agreement of ±1.07 °C and a standard error of measurement of ±0.39 °C. In conclusion, Tint does not mirror Trec during prolonged, intense running with cold fluid ingestion and, therefore, these measures should not be used interchangeably under this scenario.

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Section: Discussionmentioning

confidence: 99%

Intestinal temperature does not reflect rectal temperature during prolonged, intense running with cold fluid ingestion

et al. 2015

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“…In aerobic tests to exhaustion, a significant increase in FC max is observed in heat stress. Nevertheless, Kenefick et al (2009) did not find significant differences in HR max in a maximal incremental aerobic test in normothermia after 15 min of exposure to heat (50 °C) [ 20 ]. Thus, the effect of heat stress must be maintained during exercise to cause changes in HR.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, in anaerobic tests, power production could be enhanced. It has been documented that power is improved in heat stress situations, however, there are limited research studies where the effect of previous exposure to heat on power is observed, and the results are inconclusive [ 18 , 19 , 20 , 21 ]. These results could be explained by the fact that the thermal stimulation was not sufficient to produce the mechanisms described above.…”

Section: Introductionmentioning

confidence: 99%

Effects of High Temperature Exposure on the Wingate Test Performance in Male University Students

Toro-Román

Prieto-González

Siquier-Coll

et al. 2023

IJERPH

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It has been suggested that heat exposure prior to exercise could induce changes in anaerobic exercise. Therefore, the purpose of this study was to observe the effects of high temperature heat exposure prior to an anaerobic test. Twenty-one men (age: 19.76 ± 1.22 years; height: 1.69 ± 0.12 m; weight: 67.89 ± 11.78 kg) voluntarily participated in this investigation. All of them performed two Wingate tests, vertical jump and macronutrient intake control. On the first day, the test was performed under normal environmental conditions. On the second day, it was performed in a similar way, but with previous exposure to heat at high sauna temperatures (15 min; 100 ± 2 °C). There were no differences in the vertical jump and macronutrient intake. However, the results showed an improvement in power (W) (p < 0.05), relative power (W/kg) (p < 0.01) and revolutions per minute (p < 0.05) 10 s after the start of the test. There was also an increase in thigh (p < 0.01) and skin temperature (p < 0.01) with pre-heat exposure. The results obtained suggest that this pre-exercise protocol could improve power in short and intensive actions.

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“…Participants exited the heated chamber and rested in a cool room (~21°C, ~40% relative humidity) in front of a fan (airflow = 4.48 m·s −1 ) while consuming tepid water ad libitum . Rest between the GXT and the verification phase test was anchored to the time required for T gi restoration to baseline to minimize exercise-heat stress carryover effects on subsequent high intensity aerobic performance (35). T gi recovery after heavy exercise in the heat may require four to five times longer than the duration of exercise (36), an estimation in line with previous data (17) and within rest period ranges used in previous verification phase studies (37).…”

Section: Methodsmentioning

confidence: 99%

Verification Phase Confirms V̇O2max in a Hot Environment in Sedentary Untrained Males

Pryor

Lao

Leija

et al. 2023

Medicine &Amp; Science in Sports &Amp; Exercise

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The verification phase is becoming the norm for confirming VO 2max during a graded exercise test (GXT), but the use of such testing in untrained participants in the heat remains unknown. Purpose: This study aimed to assess the VO 2 uptake obtained during a GXT and subsequent verification phase in untrained participants in a hot environment. Methods: Twelve sedentary males completed a GXT followed by a biphasic supramaximal-load verification phase in a hot environment (39°C, 32% relative humidity). Rest between tests occurred in a temperate chamber and lasted until gastrointestinal temperature returned to baseline. Results: Mean verification phase VO 2max (37.8 ± 4.3 mL•kg −1 •min −1 ) was lower than GXT (39.8 ± 4.1 mL•kg −1 •min −1 ; P = 0.03) and not statistically equivalent. Using an individualized analysis approach, only 17% (2/12) of participants achieved a VO 2 plateau during the GXT. Verification phase confirmed GXT VO 2max in 100% of participants, whereas the traditional and the new age-dependent secondary VO 2max criteria indicated GXT VO 2max achievement at much lower rates (8/12 [67%] vs 7/12 [58%], respectively). Correlational indices between GXT and verification phase VO 2max were strong (intraclass correlation coefficient = 0.95, r = 0.86), and Bland-Altman analysis revealed a low mean bias of −2.1 ± 1.9 mL•kg −1 •min −1 and 95% limits of agreement (−5.8 to 1.7 mL•kg −1 •min −1 ). Conclusions: Very few untrained males achieved a VO 2 plateau during GXT in the heat. When conducting GXT in a hot condition, the verification phase remains a valuable addition to confirm VO 2max in untrained males.

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Impact Of Prior Heat Stress On Subsequent Aerobic Exercise Performance

Cited by 3 publications

References 0 publications

Intestinal temperature does not reflect rectal temperature during prolonged, intense running with cold fluid ingestion

Intestinal temperature does not reflect rectal temperature during prolonged, intense running with cold fluid ingestion

Effects of High Temperature Exposure on the Wingate Test Performance in Male University Students

Verification Phase Confirms V̇O2max in a Hot Environment in Sedentary Untrained Males

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