Do overweight and obese individuals select a "moderate intensity" workload when asked to do so?

Area of Science:

• Exercise Physiology
• Cardiovascular Health
• Obesity Research

Background:

• Overweight and obesity are significant public health concerns.
• Moderate-intensity exercise is recommended for cardioprotective benefits.
• Understanding self-selected exercise intensity in these populations is crucial.

Purpose of the Study:

• To assess if overweight/obese adults self-select moderate exercise intensity.
• To compare self-selected intensity to a prescribed cardioprotective workload (60% peak aerobic capacity).

Main Methods:

• 33 overweight/obese adults (BMI ≥ 27 kg/m²) completed two 30-minute walking sessions.
• Session 1: Self-selected pace on an indoor track.
• Session 2: Prescribed pace (60% VO₂ peak) on a treadmill, measuring oxygen consumption and energy expenditure.

Main Results:

• Prescribed intensity was 6% higher than self-selected, yielding greater energy expenditure (+83 kJ).
• Overweight individuals exercised at a lower %VO₂ peak than obese individuals (P < 0.05).
• Men exercised at a lower %VO₂ peak than women (P < 0.05).

Conclusions:

• Overweight/obese individuals tend to self-select a sustainable, lower-moderate intensity.
• This self-selected intensity may not reach the higher levels needed for optimal cardioprotection.
• Higher, more cardioprotective intensities may not be sustainable for 30 minutes in this population.