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Representative double-plotted wheel-running actograms of male Siberian (A, B) and Syrian (C, D) hamsters with bifurcated activity rhythms in LDLD8:4:8:4 and unbifurcated rhythms in LD20:4. Times of light and dark are represented above actograms with white and black filled rectangles, respectively. Scaling of the ordinate is from 0-177, 0-150, 0-164, and 0-188 counts/min for A-D, respectively. Displayed activity data are shown for 4–5 weeks prior to the first blood sampling.
