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Re-evaluation of exercise intensity for overweight Japanese men by ventilatory threshold
N Miyatake1, H Nishikawa, A Morishita
1Okayama Southern Institute of Health, Okayama, Japan. centre@okakenko.jp
Diabetes, Obesity & Metabolism
|October 13, 2005
Summary
For overweight Japanese men, exercise intensity should be set at 30% heart rate (HR) reserve, not the commonly used 50% HR reserve, based on ventilatory threshold (VT) measurements.
Area of Science:
- Exercise Physiology
- Sports Medicine
- Public Health
Background:
- Overweight and obesity are significant health concerns, particularly in Japanese men.
- Accurate exercise intensity prescription is crucial for effective weight management and cardiovascular health.
- Current exercise intensity guidelines may not be optimal for this demographic.
Purpose of the Study:
- To re-evaluate and determine appropriate exercise intensity for overweight Japanese men.
- To compare heart rate (HR) at ventilatory threshold (VT) with calculated HR reserve using Karvonen's formula.
- To establish evidence-based exercise recommendations for this population.
Main Methods:
- A cross-sectional clinical intervention study involving 110 overweight Japanese men (aged 32-59).
- Aerobic exercise capacity assessed via ventilatory threshold (VT).
- Heart rate reserve (HRR) calculated using Karvonen's formula and compared to HR at VT.
Main Results:
- A significant correlation was found between HR at VT and 50% HR reserve (r=0.642, p<0.01).
- However, HR at VT was significantly lower than 50% HR reserve (103.6±10.6 vs. 125.0±7.1 bpm, p<0.01).
- HR at VT corresponded to approximately 28.5% HR reserve.
Conclusions:
- The commonly prescribed 50% HR reserve is likely too high for overweight Japanese men.
- An exercise intensity of 30% HR reserve is recommended for this population.
- This finding aids in optimizing exercise prescriptions for improved health outcomes.
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Purposes