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Effect of individual environmental heat-stress variables on training and recovery in professional team sport

journal contribution
posted on 30.11.2020, 00:00 by FK O'Connor, SE Stern, Thomas Doering, GM Minett, PR Reaburn, JD Bartlett, VG Coffey
CONTEXT: Exercise in hot environments increases body temperature and thermoregulatory strain. However, little is known regarding the magnitude of effect that ambient temperature (Ta), relative humidity (RH), and solar radiation individually have on team-sport athletes. PURPOSE: To determine the effect of these individual heat-stress variables on team-sport training performance and recovery. METHODS: Professional Australian Rules Football players (N = 45) undertook 8-wk preseason training producing a total of 579 outdoor field-based observations with Ta, RH, and solar radiation recorded at every training session. External load (distance covered, in m/min; percentage high-speed running [%HSR] >14.4 km/h) was collected via a global positioning system. Internal load (ratings of perceived exertion and heart rate) and recovery (subjective ratings of well-being and heart-rate variability [root mean square of the successive differences]) were monitored throughout the training period. Mixed-effects linear models analyzed relationships between variables using standardized regression coefficients. RESULTS: Increased solar-radiation exposure was associated with reduced distance covered (-19.7 m/min, P < .001), %HSR (-10%, P < .001) during training and rMSSD 48 h posttraining (-16.9 ms, P = .019). Greater RH was associated with decreased %HSR (-3.4%, P = .010) but increased percentage duration >85% HRmax (3.9%, P < .001), ratings of perceived exertion (1.8 AU, P < .001), and self-reported stress 24 h posttraining (-0.11 AU, P = .002). In contrast, higher Ta was associated with increased distance covered (19.7 m/min, P < .001) and %HSR (3.5%, P = .005). CONCLUSIONS: The authors show the importance of considering the individual factors contributing to thermal load in isolation for team-sport athletes and that solar radiation and RH reduce work capacity during team-sport training and have the potential to slow recovery between sessions.

History

Volume

15

Issue

10

Start Page

1393

End Page

1399

eISSN

1555-0273

ISSN

1555-0265

Publisher

Human Kinetics

Language

eng

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Bond University; Queensland University of Technology

Era Eligible

Yes

Journal

International Journal of Sports Physiology and Performance

Exports