The Effect of a Resistance Training Session on Physiological and Thermoregulatory Measures of Sub-maximal Running Performance in the Heat in Heat-Acclimatized Men

Kenji Doma; Anthony Nicholls; Daniel Gahreman; Felipe Damas; Cleiton Augusto Libardi; Wade Sinclair

doi:10.1186/s40798-019-0195-y

The Effect of a Resistance Training Session on Physiological and Thermoregulatory Measures of Sub-maximal Running Performance in the Heat in Heat-Acclimatized Men

Sports Med Open. 2019 Jun 4;5(1):21. doi: 10.1186/s40798-019-0195-y.

Authors

Kenji Doma¹, Anthony Nicholls², Daniel Gahreman³, Felipe Damas⁴, Cleiton Augusto Libardi⁴, Wade Sinclair²

Affiliations

¹ College of Healthcare Sciences, James Cook University, James Cook Drive, Rehab Sciences Building, Townsville, QLD, 4811, Australia. kenji.doma@jcu.edu.au.
² College of Healthcare Sciences, James Cook University, James Cook Drive, Rehab Sciences Building, Townsville, QLD, 4811, Australia.
³ Exercise and Sport Science, Charles Darwin University, Casuarina, Australia.
⁴ MUSCULAB - Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos - UFSCar, São Carlos, Brazil.

Abstract

Background: The current study examined the acute effects of a lower body resistance training (RT) session on physiological and thermoregulatory measures during a sub-maximal running protocol in the heat in heat-acclimatized men. Ten resistance-untrained men (age 27.4 ± 4.1 years; height 1.78 ± 0.06 m; body mass 76.8 ± 9.9 kg; peak oxygen uptake 48.2 ± 7.0 mL kg^-1 min^-1) undertook a high-intensity RT session at six-repetition maximum. Indirect muscle damage markers (i.e., creatine kinase [CK], delayed-onset muscle soreness [DOMS], and countermovement jump [CMJ]) were collected prior to, immediately post and 24 and 48 h after the RT session. The sub-maximal running protocol was performed at 70% of the ventilatory threshold, which was conducted prior to and 24 and 48 h following the RT session to obtain physiological and thermoregulatory measures.

Results: The RT session exhibited significant increases in DOMS (p < 0.05; effect size [ES]: 1.41-10.53), whilst reduced CMJ (p < 0.05; ES: - 0.79-1.41) for 48 h post-exercise. There were no differences in CK (p > 0.05), although increased with moderate to large ES (0.71-1.12) for 48 h post-exercise. The physiological cost of running was increased for up to 48 h post-exercise (p < 0.05) with moderate to large ES (0.50-0.84), although no differences were shown in thermoregulatory measures (p > 0.05) with small ES (0.33).

Conclusion: These results demonstrate that a RT session impairs sub-maximal running performance for several days post-exercise, although thermoregulatory measures are unperturbed despite elevated muscle damage indicators in heat-acclimatized, resistance untrained men. Accordingly, whilst a RT session may not increase susceptibility to heat-related injuries in heat-acclimatized men during sub-maximal running in the heat, endurance sessions should be undertaken with caution for at least 48 h post-exercise following the initial RT session in resistance untrained men.

Keywords: Core temperature; Creatine kinase; Delayed-onset of muscle soreness; Running economy; Strength training.