بررسي ارتباط قدرت عضلاني اندام هاي پاييني با سن در زنان سالم

The Relationship of Lower Limbs Muscle Strength with Aging in Healthy Women

Background and purpose: Human muscle strength is affected by life style, physical activities and recreation. Lower limbs antigravity muscles weakness has significant role in falling. Because of great effects of balance and muscle strength in health of the elder population, the purpose of the present study was to evaluate the effects of aging on muscle strength and to determine the age range of muscle strength reduction in women aged 21 to 80 years old. Materials and methods: This cross-sectional study was performed on 101 healthy subjects. The subjects were divided into six age groups with 15 to 20 women in each group. Maximum isometric strength of four muscle groups was measured using a hand-held dynamometer, bilaterally. Results: The results indicated that the muscle strength was significantly decreased with aging (P0.0001). The force changes in hip extensor and ankle dorsiflexor muscles were not significant between age 21 to 40 years, but after that it was significantly reduced (PO.OOOl). The changes of knee extensor and hip abductor muscles force were not significant up to 50 years old, but after that a significant decrease was found. Conclusion: According to the results, it can be predicted that the aging and associated loss of muscle strength leads to a significant decrease in standing balance and stability. Therefore, planning sufficient physical activities among the all age groups at risk of falling is necessary. With appropriate exercise therapy program, balance disorders and falling among the elder population can be prevented.