Effects of Exercise Intervention on Habitual Physical Activity Above Lactate Threshold Under Free-living Conditions:
M Ayabe1, H Kumahara2, K Morimura2
1Faculty of Computer Science and Systems Engineering, Okayama Prefectural University, Okayama, Japan.
International Journal of Sports Medicine
|October 1, 2015
Summary
An 8-week exercise intervention improved aerobic capacity and body composition in middle-aged men. However, it did not significantly increase daily physical activity (PA) above the lactate threshold (LT) under free-living conditions.
Area of Science:
- Exercise Physiology
- Sports Science
- Public Health
Background:
- Regular physical activity (PA) is crucial for health, especially in middle-aged and older adults.
- Understanding the impact of exercise interventions on PA levels under free-living conditions is essential for public health guidelines.
- Lactate threshold (LT) serves as a key indicator of aerobic capacity and exercise intensity.
Purpose of the Study:
- To investigate the effects of a structured exercise intervention on daily physical activity (PA) above the lactate threshold (LT) in middle-aged to older males.
- To assess changes in body weight, visceral fat area, and LT following an 8-week intervention.
- To determine if targeted exercise improves PA levels in free-living settings.
Main Methods:
- 81 middle-aged to older males (51±7 years) were randomized into an exercise group or a control group.
- The exercise group targeted 300 min/week of exercise at their lactate threshold (LT).
- Physical activity levels were measured using a pedometer with a uni-axial accelerometer; body weight, visceral fat area, and LT were assessed before and after the 8-week intervention.
Main Results:
- The exercise group showed significant improvements in body weight, visceral fat area, and lactate threshold (LT).
- No significant differences were observed in the duration of PA at LT, >3 METs, or >6 METs between groups post-intervention.
- Despite improvements in aerobic capacity and body composition, the intervention did not significantly alter PA at LT in free-living conditions.
Conclusions:
- An 8-week exercise intervention can effectively improve aerobic capacity and body composition in middle-aged to older males.
- The intervention did not lead to a significant increase in daily physical activity (PA) above the lactate threshold (LT) under free-living conditions.
- Further research is needed to identify strategies that enhance PA levels in free-living settings following structured exercise programs.
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