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A: force frequency relationships obtained at the end of 30 min exposure to 37°C (n = 6), 40°C (n = 9), 41°C (n = 9), 42°C (n = 8), and 43°C (n = 8). Force is expressed as a % of preheat, pretreatment, tetanic force at 150 Hz. Peak twitch force is represented as zero Hz. Temperature-induced increases in passive tension are also shown (inset). B: Force-frequency relationships obtained after 30 min heat exposure, followed by 30 min of recovery at 37°C. ‡‡P < 0.001 vs. 37°C.
