Key result
In isolated mouse skeletal muscle fibres, severe fatigue is primarily driven by deficient Ca2+ handling, which can be partially reversed by caffeine (force output rose from 29.8% to 82.5%).
Force decline during severe fatigue in mouse skeletal muscle is primarily driven by deficient Ca2+ handling, which can be partially reversed by caffeine.
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Cautions against extrapolating caffeine effects to human fatigue; leaves open mechanistic validation in intact systems.
Lännergren et al. (1991) studied Muscle fatigue (n=25). Fatiguing stimulation, Caffeine, and Intracellular acidosis vs. Rested state / normal conditions was evaluated on Tetanic force decline and recovery. In isolated mouse skeletal muscle fibres, severe fatigue is primarily driven by deficient Ca2+ handling, which can be partially reversed by caffeine (force output rose from 29.8% to 82.5%).
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