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Inter-Session Reliability of an Isometric Muscle Strength Protocol in Older Adults
Oscar Andrades-Ramírez1,2, Domingo Ceballos-Sepulveda1, Benjamín Fuentealba-Martínez1
1Facultad de Educación y Ciencias Sociales, Universidad Andres Bello, Concepción 4070387, Chile.
Journal of Functional Morphology and Kinesiology
|January 21, 2026
Summary
Maximal isometric muscle strength tests, including bilateral seated bench press and row, and unilateral knee extensions, are reliable for older adults. These findings support their use in assessing strength in the elderly population.
Area of Science:
- Gerontology
- Exercise Physiology
- Biomechanics
Background:
- Assessing maximal isometric muscle strength is crucial for understanding functional capacity in older adults.
- Reliability studies are essential to validate measurement tools for this demographic.
Purpose of the Study:
- To analyze the intersession absolute and relative reliability of maximal isometric muscle strength tests in older adults.
- To evaluate the reliability of bilateral seated bench press (BSBP), bilateral seated row (BSR), unilateral seated knee right extension (USKER), and unilateral seated knee left extension (USKEL).
Main Methods:
- Eighteen older adults (mean age 69.38 years) participated in the study.
- Maximal isometric strength was assessed in a seated position using BSBP, BSR, USKER, and USKEL protocols.
- Three 5-second maximal effort sets with 3-minute rest intervals were performed for each measurement.
Main Results:
- Acceptable absolute reliability was found for BSR and USKER.
- Extremely high reliability was observed for BSBP and USKEL measures.
- All assessments demonstrated extremely high relative reliability with no significant differences (p > 0.05) and null effect sizes (ES < 0.12).
Conclusions:
- Maximal isometric muscle strength assessments using the Chronojump Force Sensor Kit are reliable and reproducible in the elderly population.
- The BSBP, BSR, USKER, and USKEL protocols provide dependable strength measurements for older adults.
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