Fig 3: Experiment 2 - Locomotor and heart rate activity in a lobster exposed to LD and housed in a running wheel. The lobster was free to run in the running wheel for the first 10 days of the experiment while it was confined to half of the running wheel during the second 10 days period. Scale: HR=min-0, max-152 bpm; Loco=min-0, max-24 rpm. There was no statistical difference (t(6)=-0.5, p=0.63) detected between the periods of heart rate (23.85 +/- 0.17) and locomotion (23.97 +/- 0.12) while the wheels were "spinnable". The calculated tau of heart rate while the wheels were stuck was 23.44 +/- 0.60 (n=3). While significant running wheel rhythms were observed in all lobsters, the rhythms were not as robust as those seen in Experiment 1. Only 2/6 individuals exhibited significant heart rate rhythms while the wheel was spinnable. 3/6 individuals exhibited significant heart rate rhythms while the wheel was not spinnable.
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