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Total duration of foot shock received in the treadmill fatigue test: (A) habituation phase, (B) test phase. In (A), habituation comprised 2 min at a speed of 0 cm/sec, 5 min at 15–20 cm/sec at 1 min increments, and 5 min at 20 cm/sec. In (B), the maximum cumulative duration of foot shock allowed was 10 sec and then the test was terminated; otherwise the maximum test duration was 20 min.
