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Isokinetic and static plantar flexion characteristics
Summary
This study found that maximum plantar flexion strength declines with age after 49 and is lower in females. Anthropometric variables, age, and physical activity explain most strength variations.
Area of Science:
- Biomechanics
- Human Physiology
- Gerontology
Background:
- Plantar flexion strength is crucial for mobility and balance.
- Understanding factors influencing plantar flexion strength is important for assessing functional capacity and age-related changes.
Purpose of the Study:
- To investigate the relationship between isokinetic and static maximum plantar flexion torques.
- To identify age, sex, and anthropometric predictors of plantar flexion strength.
- To model the decline in strength with increasing isokinetic velocity.
Main Methods:
- Measured isokinetic and static maximum plantar flexion torques in 135 adults with sedentary professions.
- Analyzed strength differences based on age, sex, limb dominance, and knee position.
- Applied a negative exponential model to describe strength decline with velocity.
Main Results:
- Strong correlation found between isokinetic and static plantar flexion torques.
- Strength remained stable between 20-49 years, then declined with age.
- Females exhibited 35% lower strength than males; knee flexion reduced strength by 15%.
Conclusions:
- Age and sex are significant determinants of plantar flexion strength.
- Anthropometric variables, age, and physical activity explain a substantial portion of strength variability.
- Formulas are provided for estimating expected static and isokinetic plantar flexion strength.