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SLEEP 2021 PRESENTATION — LONGITUDINAL HRV CHANGES

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For sleepers under 50, SDNN declined at a rate of about 2.1 ms/year, then leveled off for sleepers aged 50-65, and increased slightly thereafter.
Women under 50 displayed lower, more slowly declining SDNN values than men, but this trend reversed for sleepers over 50.
Throughout the week, SDNN values followed a U- shaped (women) or L-shaped (men) pattern, where values were highest during the weekend and lowest at mid-week.

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