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• W2618744385 abstract "The balance between leg flexor and extensor strength, which is typically assessed using the hamstrings to quadriceps (H/Q) strength ratio, has been implicated as an important factor in the muscle power and functional performance abilities of aging populations. Declines in hamstrings and quadriceps maximal and rapid strength are commonly reported as a consequence of aging; however, few studies have investigated the influence of age on maximal and rapid strength H/Q ratios. PURPOSE: To examine age-related differences in maximal and rapid strength H/Q ratios between young and old females and the relationships of these characteristics with vertical jump power. METHODS: Fifteen young (age = 21 ± 2 yr) and 15 old (69 ± 7 yr) females performed three countermovement vertical jumps (CMJs) followed by three isometric maximal voluntary contractions (MVCs) of the leg extensors and flexors. Estimated peak power output (Pmax) was measured during the CMJs using a linear velocity transducer. For each MVC, participants sat in an upright position and were instructed to extend or flex the leg “as hard and fast as possible” against a load cell attached to the heel for 3-4 s. Maximal and rapid isometric H/Q strength ratios were determined by taking the quotients between leg flexor and extensor peak torque (PT H/Q) and rate of torque development at 0-200 ms (RTD200 H/Q). RESULTS: The old females exhibited lower Pmax (old = 1075.87 ± 376.78 W; young = 3131.07 ± 1426.22 W; P < 0.001) and higher PT H/Q (old = 0.71 ± 0.24; young = 0.54 ± 0.13; P = 0.030) and RTD200 H/Q (old = 0.85 ± 0.25; young = 0.61 ± 0.22; P = 0.008) than the young females. There was a significant relationship between Pmax and RTD200 H/Q in the old females (r = -0.522; P = 0.046); however, there was no such relationship in the young females (r = -0.109; P = 0.698) nor were there any relationships between Pmax and PT H/Q for either age group (young r = 0.029; P = 0.918; old r = -0.364; P = 0.182). CONCLUSION: These findings demonstrated that maximal and rapid strength H/Q ratios increase and muscle power decreases at old age. The significant relationship observed between Pmax and RTD200 H/Q in the old females perhaps suggests that these age-related increases in rapid antagonist muscle strength ratios may play a significant role in the lower muscle power and functional performance abilities observed in older adults." @default.
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• W2618744385 date "2017-05-01" @default.
• W2618744385 modified "2023-09-24" @default.
• W2618744385 title "Age-related Differences in Maximal and Rapid Hamstrings to Quadriceps Strength Capacities and Vertical Jump Power" @default.
• W2618744385 doi "https://doi.org/10.1249/01.mss.0000517816.38795.71" @default.
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