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 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.

Objective: To investigate the effects of modified stepping exercises over six weeks on functional mobility and individual lower extremity muscle strength in community-dwelling older individuals. Methods: This prospective randomized controlled trial design was conducted in thirty-two older adults who completed a modified stepping exercises program (n=16 for soft-surface stepping exercise; n=16 for firm-surface stepping exercise). These exercises were practiced for 50 minutes/day, three days/week, over six weeks. They were assessed for their functional mobility relating to levels of independence at baseline, after 4 weeks, after 6 weeks of intervention, and at 1 month after the last intervention sessions. Results: Both groups showed significant improvements in functional mobility, lower extremity muscle strength, and walking speed after 4 and 6 weeks of intervention, as well as at the one-month follow-up. However, the soft-surface stepping exercise group exhibited significantly greater improvements in dynamic balance (p=0.035) and lower extremity muscle strength (p=0.015) compared to the firm-surface stepping exercise group after 6 weeks of intervention. Additionally, the soft-surface group demonstrated superior gains in hip flexor (p=0.041), hip extensor (p=0.047), hip adductor (p=0.026), and hip abductor strength (p=0.046), with these enhancements maintained at the one-month follow-up. Conclusion Soft-surface stepping exercise that involves whole-body movements offers a promising alternative to promote independence and safety among community-dwelling older adults. This study underscores the need for future research to evaluate the sustained impact of these benefits post-intervention, particularly during a retention period following the intervention.

Objective: To investigate the effects of modified stepping exercises over six weeks on functional mobility and individual lower extremity muscle strength in community-dwelling older individuals. Methods: This prospective randomized controlled trial design was conducted in thirty-two older adults who completed a modified stepping exercises program (n=16 for soft-surface stepping exercise; n=16 for firm-surface stepping exercise). These exercises were practiced for 50 minutes/day, three days/week, over six weeks. They were assessed for their functional mobility relating to levels of independence at baseline, after 4 weeks, after 6 weeks of intervention, and at 1 month after the last intervention sessions. Results: Both groups showed significant improvements in functional mobility, lower extremity muscle strength, and walking speed after 4 and 6 weeks of intervention, as well as at the one-month follow-up. However, the soft-surface stepping exercise group exhibited significantly greater improvements in dynamic balance (p=0.035) and lower extremity muscle strength (p=0.015) compared to the firm-surface stepping exercise group after 6 weeks of intervention. Additionally, the soft-surface group demonstrated superior gains in hip flexor (p=0.041), hip extensor (p=0.047), hip adductor (p=0.026), and hip abductor strength (p=0.046), with these enhancements maintained at the one-month follow-up. Conclusion Soft-surface stepping exercise that involves whole-body movements offers a promising alternative to promote independence and safety among community-dwelling older adults. This study underscores the need for future research to evaluate the sustained impact of these benefits post-intervention, particularly during a retention period following the intervention.

Objective: To investigate the effects of modified stepping exercises over six weeks on functional mobility and individual lower extremity muscle strength in community-dwelling older individuals. Methods: This prospective randomized controlled trial design was conducted in thirty-two older adults who completed a modified stepping exercises program (n=16 for soft-surface stepping exercise; n=16 for firm-surface stepping exercise). These exercises were practiced for 50 minutes/day, three days/week, over six weeks. They were assessed for their functional mobility relating to levels of independence at baseline, after 4 weeks, after 6 weeks of intervention, and at 1 month after the last intervention sessions. Results: Both groups showed significant improvements in functional mobility, lower extremity muscle strength, and walking speed after 4 and 6 weeks of intervention, as well as at the one-month follow-up. However, the soft-surface stepping exercise group exhibited significantly greater improvements in dynamic balance (p=0.035) and lower extremity muscle strength (p=0.015) compared to the firm-surface stepping exercise group after 6 weeks of intervention. Additionally, the soft-surface group demonstrated superior gains in hip flexor (p=0.041), hip extensor (p=0.047), hip adductor (p=0.026), and hip abductor strength (p=0.046), with these enhancements maintained at the one-month follow-up. Conclusion Soft-surface stepping exercise that involves whole-body movements offers a promising alternative to promote independence and safety among community-dwelling older adults. This study underscores the need for future research to evaluate the sustained impact of these benefits post-intervention, particularly during a retention period following the intervention.