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- W1969920857 abstract "1437 The purpose of the present study was to investigate race differences in viscoelastic characteristics of triceps surae muscle group. Non-athlete White(n=14) and Black (n=7) individuals between 11 and 40 years of age and ranging from 156 to 190 cm in height and 53 to 134 kg in body weight participated in this study. Viscoelastic properties were assessed using the free vibration technique: subjects sit with their forefeet on the edge of a force-plate(Kistler, Switzerland) and support a frame loaded with weights (0 to 40 kg) on the knees. Oscillations of the triceps surae and Achilles tendon system were initiated with a hand-held hammer (Kistler) by tapping the weight load. Striking force was monitored by a transducer in the head of the hammer. Oscillations occur at frequencies of 3-6 Hz and are lightly damped. The damped oscillations in conjunction with the equation of motion of a damped mass-spring model were used to calculate the viscosity of muscle (b), and the elasticity of muscle fibers (kf) and tendon (kt) in each subject. Thickness of the soleus and Achilles tendon was measured by ultrasonography (Aloka, Japan). The solues and Achilles tendon thickness showed almost same value between Whites (18.7 mm and 5.0 mm) and Blacks (20.9 mm and 4.8 mm). Also, kf similar in both Whites (315 N/m) and Blacks (357 N/m). On the other hand, the following tendency was obtained: b (509 N/(m/s)) and kt (5.15 x 105 N/m) of Blacks were greater than those of Whites (b: 416 N/(m/s), kt: 3.38 x 105 N/m). Our data suggests that Blacks have greater muscle viscosity and Achilles tendon stiffness than Whites, with similar muscle fiber elasticity." @default.
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- W1969920857 date "1998-05-01" @default.
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- W1969920857 title "RACE DIFFERENCES IN VISCOELASTIC CHARACTERISTICS OF HUMAN TRICEPS SURAE" @default.
- W1969920857 doi "https://doi.org/10.1097/00005768-199805001-01436" @default.
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