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Objective:

The lower rates of adherence to physical activity commonly found among overweight adults compared to their normal-weight counterparts might be due to the activity being experienced as more laborious and less pleasant, particularly when its intensity is prescribed (or imposed) rather than self-selected.

Design:

Within-subject design, with two 20-min sessions of treadmill exercise, one at self-selected speed and one at imposed speed, 10% higher than the self-selected.

Subjects:

A total of 16 overweight (BMI: 31 kg/m 2) and 9 normal-weight (BMI: 22 kg/m 2) previously sedentary but healthy women (age: 43 years).

Measurements:

Heart rate, oxygen uptake relative to body weight, and ratings of perceived exertion and pleasure–displeasure were assessed every 5 min.

Results:

The overweight women showed higher oxygen uptake and perceived exertion than the normal-weight women during both sessions …