Extreme Temperatures, Physical Activity, and Adaptation

Area of Science:

• Environmental Science
• Public Health
• Behavioral Science

Background:

• Physical activity is crucial for human health.
• The effects of climate change on physical activity are not well understood.
• Extreme temperatures pose a significant environmental stressor.

Purpose of the Study:

• To quantify the impact of extreme temperatures on physical activity.
• To investigate adaptive behaviors in response to heat.
• To project future physical activity levels under climate change scenarios.

Main Methods:

• Utilized a large dataset of 24 billion person-minute observations from US Fitbit users.
• Analyzed behavioral and performance responses to extreme hot and cold temperatures.
• Compared activity levels across different climate regions to assess adaptation.

Main Results:

• Significant reductions in physical activity were observed on extreme hot and cold days.
• Intraday and interday substitution partially mitigated activity loss.
• Regions with hotter climates demonstrated less sensitivity to extreme heat, indicating adaptation.

Conclusions:

• Extreme temperatures negatively affect physical activity, but adaptation occurs.
• Future physical activity projections should incorporate regional climate adaptation for accurate welfare assessments.
• Understanding these responses is vital for public health strategies in a changing climate.