Table 1.

Baseline characteristics of the participants (mean ± SD)

	Young adults			Older adults
	Women	Men	Mean	Women	Men	Mean
Age (years)	22.5±3.3	24.7±4.0	23.5±3.7	65.8±4.9	66.6±4.5	66.1±4.7a
Height (cm)	165.1±5.4	178.0±6.7	171.0±8.8	160.8±6.2	174.0±7.3	166.2±9.3a, b
Weight (kg)	63.2±8.5	78.7±9.5	70.2±11.8	62.3±7.3	77.4±10.4	68.5±11.4b
Home bedtime	12:06 am ±1.0h	12:44 am ±1.2h	12:23 am ±1.1 h	10:05 pm ±1.1 h	10:24 pm ±1.1 h	10:13 pm ±1.1 ha, b
Home wake time	8:04 am ±1.2 h	8:49 am ±1.1 h	8:23 am ±1.2 h	6:23 am ±1.1 h	6:15 am ±1.1 h	6:20 am ±1.1 ha
Home sleep duration	400.5±63.5	407.3±45.9	403.1±56.8	412.3±44.2	355.5±62.7	388.6±59.2
CESD	5.3±4.5	4.2±5.2	4.8±4.8	3.9±4.4	3.46±4.3	3.6±4.3
${\dot{V}}_{{\mathrm{O}}_2\max }$ (mL kg–1 min−1)	43.8±6.7	49.2±7.0	46.2±7.3	28.8±6.1	35.9±10.4	31.7±8.8a, b
aMT6s mesor	744.3±468.4	780.7±614.7	760.9±534.7	393.2±337.4	373.2±321.7	384.9±328.0a
aMT6s Acrophase	3:38 am ±1.49 h	4:39 am ±1.85 h	4:05 am ±1.73 h	2:17 am ±1.50 h	3:39 am ±1.53 h	2:51 am ±1.64 ha, b
aMT6s onset	10:43 pm ±1.59 h	12:01 am ±1.86 h	11:19 pm ±1.82 h	9:18 pm ±1.72 h	10:50 pm ±1.71 h	9:58 pm ±1.87 ha, b
aMT6s offset	8:21 am ±1.58 h	9:02 am ±2.14 h	8:40 am ±1.86 h	7:14 am ±1.78 h	8:31 am ±1.53 h	7:48 am ±1.78 ha, b
aMT6s duration (h)	9.6±1.1	9.1±1.4	9.4±1.3	10.0±1.3	9.7±1.2	9.8±1.3

CESD, Center for Epidemiologic Studies‐Depression.

^aSignificant age difference.

^bSignificant sex difference.