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[Chronobiological case study on cardiac responses during aerobic exercise]
1Mie Occupational Health Promotion Center, 33-1 Higashi-marunouchi, Tsu, Mie 514-0028, Japan.
Sangyo Eiseigaku Zasshi = Journal of Occupational Health
|October 30, 2001
Summary
Morning exercise at 50% heart rate reserve showed significant differences in physiological responses compared to evening exercise. These exercise timing effects stabilized over months and impacted energy consumption and perceived exertion.
Area of Science:
- Exercise Physiology
- Chronobiology
Background:
- Investigating the impact of exercise timing on physiological responses in older adults.
- Assessing the influence of morning versus evening aerobic exercise on key health indicators.
Observation:
- A 70-year-old male performed 20-minute aerobic exercise at 50% heart rate reserve over two years.
- Measurements included heart rate, time to target heart rate, power output, energy consumption, and RPE.
- Observed effects of exercise timing (morning vs. evening) and jet lag.
Findings:
- Morning exercise (Mor. Ex.) showed increased heart rate, shortened time to target HR, decreased loaded power, decreased energy consumption, and decreased RPE.
- Evening exercise (Even. Ex.) showed unchanged time to target HR, unchanged loaded power, increased energy consumption, and increased RPE.
- Significant differences were found between morning and evening exercise across all measured indicators, with effects stabilizing after 6-9 months.
Implications:
- Exercise timing significantly influences physiological adaptations and energy expenditure in older adults.
- Understanding chronobiological effects on exercise response is crucial for optimizing training programs.
- Jet lag can temporarily reduce exercise energy consumption, requiring several days for recovery.