Bidirectional association between physical activity and sleep in healthy Japanese super-seniors: the Japan Healthy Aging Study (J-HAS).

The association was marginally non-significant in Model 2 (0.54 × 10 −3 steps per thousand; 95% CI: −4.05 × 10 −7 , 1.08 × 10 −3 ) but became significant and slightly strengthened in Model 3 (0.55 × 10 −3 steps per thousand; 95% CI: 4.96 × 10 −6 , 1.08 × 10 −3 ).

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