Weekly curation
What this week's longevity research found
Two recent studies relate lifestyle factors and heatwaves to measures of biological aging.
This week's highlights
Physical activity, sedentary behavior, sleep quality and biological aging clocks
Original title: Physical activity, sedentary behavior, sleep quality and the biological aging clocks
What the source reports
In this cross-sectional analysis of 890 adults aged 20 to 102 from the INSPIRE-t cohort, researchers compared questionnaires about activity, sitting time, and sleep with five measures of biological aging. Among older adults, higher physical activity was associated with attenuation of some associations between poorer sleep and faster aging-clock measures.
Why it is worth following
The study examines how activity, sedentary time, and sleep may relate together to different biological aging indicators, rather than evaluating each factor in isolation.
Evidence context and limitations
The cross-sectional design cannot establish which factor came first or show that changing these behaviors alters biological aging. Activity, sitting time, and sleep were estimated by questionnaires, and biological clocks are indirect measures, not clinical longevity outcomes.
Nighttime heatwaves and biological aging in middle-aged and older adults in China
Original title: Daytime, nighttime, and day-night compound heatwaves and accelerated biological ageing: national cross-sectional and longitudinal evidence in China
What the source reports
In cross-sectional analyses of 8,223 people and longitudinal analyses of 5,047 participants from a national Chinese cohort aged 45 and older, longer heatwave exposure was associated with greater biological age acceleration. Associations were more consistent for nighttime and combined day-and-night events than for daytime heatwaves.
Why it is worth following
The results draw attention to heat exposure at night, which can be overlooked in studies and alerts focused on daytime high temperatures.
Evidence context and limitations
The analyses are observational and use data from a Chinese cohort collected in 2011 and 2015; they do not prove that heatwaves caused the differences in the markers. Biological age was estimated from biomarkers, and the findings do not show that these markers directly predict individual health or longevity.