Monetary cost for time spent in everyday physical activities

Area of Science:

• Behavioral Economics
• Physical Activity Research

Background:

• Understanding the perceived cost of physical activity is crucial for designing effective health interventions.
• Individual factors like gender, income, and body mass index (BMI) may influence how people value time and effort.

Purpose of the Study:

• To measure utility curves for hypothetical monetary costs associated with time spent in walking, standing, and sitting.
• To investigate the impact of gain versus loss framing on perceived costs.
• To examine how gender, income, and BMI moderate these effects.

Main Methods:

• Utility curves were measured for everyday physical activities (walking, standing, sitting) against hypothetical monetary costs.
• Gain and loss framing effects were analyzed, alongside individual factors (gender, income, BMI).

Main Results:

• More physically demanding activities exhibited steeper discount curves, indicating a higher perceived cost over time.
• Higher income (≥$45,000) and gain framing (loss aversion) were associated with steeper discount curves.
• Interactions revealed gender and income influenced framing effects: females and higher-income individuals showed loss aversion, while males and lower-income individuals did not.
• Males discounted less in gain frames; females discounted less in loss frames.
• Higher-income individuals discounted more in gain frames but not in loss frames.
• Individual discounting tendencies were consistent across different activities.

Conclusions:

• Loss-framed incentives are more effective for encouraging physical activity in women and individuals with middle-class or higher incomes.
• Loss-framed incentives offer a more uniform impact across income levels compared to gain frames.
• The findings provide a generalizable method for assessing the costs of effort in everyday activities and inform intervention design.