ArticleLife (Basel, Switzerland)2026
Task-Specific Rescue Loading Redistributes Lower Limb Joint Work During Simulated Sprinting Across Fatigue States in Firefighters.
Article in Life (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Firefighters routinely perform short-distance sprints while wearing or carrying occupational gear. Nevertheless, how fatigue interacts with task-specific loading to shape the distribution of mechanical work across lower-limb joints remains poorly understood. This study aimed to determine how fatigue state and task-specific rescue loading affect sprint performance, impact loading, lower-limb joint mechanics, joint work contribution, and muscle activation in male firefighters. Fifty-three male firefighters completed four simulated rescue sprinting tasks under five fatigue conditions: non-fatigue, whole-body fatigue, and mild, moderate, and severe local knee extensor fatigue. Tasks included unloaded sprinting and 7, 20, and 30 kg task-specific rescue-load conditions. Kinematic, kinetic, and electromyographic data were collected during the stance phase of the dominant limb. Mild local fatigue was associated with a sprinting speed comparable to the non-fatigue condition and higher than that under whole-body or moderate-to-severe local fatigue. Progressively heavier task-specific rescue loads decreased sprinting speed, prolonged stance time, increased knee work contribution, and decreased ankle work contribution, indicating a redistribution of stance-phase mechanical work from the ankle toward the knee. This compensatory pattern was further modulated by treadmill-induced global locomotor fatigue. In conclusion, this ankle-to-knee redistribution may help firefighters complete high-load rescue sprinting, but it may also increase knee mechanical demand, particularly under global locomotor fatigue.
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