. Author manuscript; available in PMC: 2014 Mar 25.

Published in final edited form as: J Biol Rhythms. 2012 Aug;27(4):287–298. doi: 10.1177/0748730412448618

Table 1. Effects of 25% D₂O on circadian and ultradian periods.

	Circadian τ		Ultradian τ′		Relative Change

	Pre	TRT	Pre	TRT	% ΔCR	% ΔUR

CR+ hamsters
H₂O → H₂O	24.3 (0.1)	24.3 (0.2)	5.6 (0.3)	5.1 (0.3)	+0.2%	−10.0%
H₂O → D₂O	24.2 (0.1)	25.0 (0.1)^a	5.3 (0.3)	4.1 (0.6)	+3.5%	−22.4%

CR− hamsters
H₂O → H₂O	—	—	3.9 (0.3)	3.9 (0.2)	—	+1.8%
H₂O → D₂O	—	—	4.2 (0.3)	3.8 (0.2)	—	−8.92%

Values indicate mean period in hours (standard error). Values are rounded to 0.1 h. Pre = 10-day pretreatment interval; TRT = 10-day treatment interval.

p < 0.001 vs. H₂O → H₂O value

Table 1. Effects of 25% D2O on circadian and ultradian periods.

Table 1. Effects of 25% D₂O on circadian and ultradian periods.