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Fig. 2. (A) Oxygen consumption (top) and wheel speed (bottom) in an 18.7 g female deer mouse voluntarily exercising at 3°C. For these analyses we used absolute values of wheel speed, ignoring changes in the direction of wheel rotation. (B) First 30 min of running, showing rapid speed changes. (C) Decline in autocorrelation over increasing inter-sample intervals. The r2 values are between samples separated by 1–200 sample intervals (1.5 s), repeated for all 8400 samples during the period indicated by the dark bar in part A (see text). Autocorrelation was negligible for intervals >150 s.





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