| Modified Squat Test for Predicting Knee Muscle Strength in Older Adults |
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Weerasak Tapanya, Noppharath Sangkarit, Pacharee Manoy, Saisunee Konsanit |
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Department of Physical Therapy, School of Allied Health Sciences, University of Phayao, Phayao 56000, Thailand |
Correspondence:
Weerasak Tapanya,
Email: weerasak.ta@up.ac.th
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Received: 10 January 2024 • Revised: 18 March 2024 • Accepted: 30 March 2024 |
| Abstract |
Background
Methods for evaluating the strength of the knee extensor muscles play a vital role in determining the functionality of the lower limbs and monitoring any alterations that occur over time in older individuals. This study assessed the validity of the modified squat test (MST) in predicting knee extensor muscle strength in older adults.
Methods
This study included a total of 110 older adults. We collected demographic information such as sex, age, body weight, height, and thigh circumference. Muscle strength was assessed by measuring the maximum voluntary isometric contraction (MVIC) of the knee extensors, and by performing the MST (5 and 10 repetitions) and single-leg standing balance test. Stepwise multiple linear regression analysis was used to investigate multiple factors impacting the prediction of knee extensor strength.
Results
Factors such as age, sex, thigh circumference, performance on the single-leg standing eye-open (SSEO) task, and the time required to complete the 10 MST repetitions together explained 77.8% of the variation in knee extensor muscle strength among older adults. We further developed a predictive equation to calculate strength as follows: strength = 36.78 − 0.24 (age) + 6.16 (sex) + 0.19 (Thigh circumference) + 0.05 (SSEO) − 0.54 (Time required to complete 10 MST repetitions) ± 5.51 kg.
Conclusion
The 10-repetition MST is an invaluable instrument for establishing an equation to accurately predict lower limb muscle strength. |
| Key Words:
Modified squat test, Aging, Older adults, Predictive equation, Lower limb, Functional test |
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