Development and validation of the physical effort scale (PES)

Area of Science:

• Psychology
• Behavioral Science
• Exercise Science

Background:

• Physical effort has traditionally been viewed as negative, but emerging research indicates it can be perceived positively.
• Individual differences in how people value physical effort may influence their engagement in physical activity.
• Understanding these tendencies is crucial for self-regulation of physical activity behaviors.

Purpose of the Study:

• To develop and validate a scale measuring individual differences in the valuation of physical effort.
• To assess tendencies to approach versus avoid physical effort.
• To contribute to a better understanding of how physical effort valuation impacts behavior.

Main Methods:

• The Physical Effort Scale (PES) was developed through expert evaluations and cognitive interviews (Study 1).
• Content validity, dimensional structure, and item reduction were examined using principal component analysis, confirmatory factor analysis, and item response theory (Study 2, n=680).
• Dimensional structure, internal consistency, construct validity, and test-retest reliability were validated (Study 3, n=297).

Main Results:

• The final 8-item PES has two dimensions: tendency to approach physical effort (4 items) and tendency to avoid physical effort (4 items).
• Both subscales demonstrated high internal consistency (Cronbach's alpha > 0.89) and explained variance in physical activity levels.
• Study 3 confirmed the two-dimension structure, internal consistency (alpha > 0.90), and acceptable test-retest reliability (ICC > 0.66), supporting construct validity.

Conclusions:

• The Physical Effort Scale (PES) is a valid and reliable instrument for measuring individual differences in the valuation of physical effort.
• The PES can assess the propensity to engage in physically demanding tasks across non-clinical populations.
• The scale provides a valuable tool for research into physical activity behavior and self-regulation.