This study will examine the effect of heat stress on factors that influence musculoskeletal injury risk in firefighters. Participants will attend 4 data collection sessions. 1: informed consent, screening, and familiarization. 2: pre-tests (strength, balance, and movement quality). 3: heat stress (rapid or gradual) followed by post-tests (strength, balance, and movement quality). 4: heat stress (rapid or gradual) followed by post-tests.
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Forward-Step-Down Test
Timeframe: Familiarization trials (session 1, recruitment); pre-testing (baseline, session 2 (approximately day 7)); post-control and post-experimental sessions (session 3 (approximately day 14) & 4 (approximately day 21)).
Y-Balance Test
Timeframe: Familiarization trials (session 1, recruitment); pre-testing (baseline, session 2 (approximately day 7)); post-control and post-experimental sessions (session 3 (approximately day 14) & 4 (approximately day 21)).
Firefighter Specific Functional Balance Test
Timeframe: Familiarization trials (session 1, recruitment); pre-testing (baseline, session 2 (approximately day 7)); post-control and post-experimental sessions (session 3 (approximately day 14) & 4 (approximately day 21)).
Knee Flexor/Extensor Isokinetic Test
Timeframe: Familiarization trials (session 1, recruitment); pre-testing (baseline, session 2 (approximately day 7)); post-control and post-experimental sessions (session 3 (approximately day 14) & 4 (approximately day 21)).
Hip Abductor/Adductor Isokinetic Test
Timeframe: Familiarization trials (session 1, recruitment); pre-testing (baseline, session 2 (approximately day 7)); post-control and post-experimental sessions (session 3 (approximately day 14) & 4 (approximately day 21)).