Effects of hip muscle activation on the stiffness and energy absorption of the trochanteric soft tissue during impact in sideways falls

被引：3

作者：

Kim, S. S. ^{[1
]}

Lim, K. T. ^{[1
]}

Park, J. W. ^{[1
]}

Choi, J. W. ^{[1
]}

Yi, C. H. ^{[2
]}

Robinovitch, S. N. ^{[3
]}

Choi, W. J. ^{[1
]}

机构：

[1] Yonsei Univ, Dept Phys Therapy, Injury Prevent & Biomech Lab, Seoul, South Korea

[2] Yonsei Univ, Dept Phys Therapy, 1 Yonseidae Gil, Wonju 26493, Gangwon Do, South Korea

[3] Simon Fraser Univ, Dept Biomed Physiol & Kinesiol, Burnaby, BC, Canada

来源：

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS | 2023年 / 138卷

基金：

新加坡国家研究基金会;

关键词：

Falls; Hip fracture; Soft tissue; Stiffness; Energy absorption; LATERAL FALLS; FORCE; STRENGTH; INDEX; RISK;

D O I：

10.1016/j.jmbbm.2022.105622

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

The trochanteric soft tissue attenuates impact force or absorbs impact energy during a fall on the hip (thereby helps to reduce a risk of hip fracture). While the benefits should be affected by contractions of muscles spanning the hip joint, no information is available to date. We examined how the stiffness (force attenuation capacity) and energy absorption of the trochanteric soft tissue were affected by hip muscle activation during a fall. Thirteen healthy young individuals (5 males, 8 females) participated in the pelvis release experiment. Falling trials were acquired with three muscle contraction conditions: 0-20% ("relaxed"), 20-50% ("moderate"), and 60-100% ("maximal") of the maximal voluntary isometric contraction of the gluteus medius muscle. During trials, we measured real-time force and deformation behaviour of the trochanteric soft tissue. Outcome variables included the stiffness and energy absorption of the soft tissue. The stiffness and energy absorption ranged from 56.1 to 446.9 kN/m, and from 0.15 to 2.26 J, respectively. The stiffness value increased with muscle contraction, and 59% greater in "maximal" than "relaxed" condition (232.2 (SD = 121.4) versus 146.1 (SD = 49.9)). However, energy absorption decreased with muscle contraction, and 58.9% greater in "relaxed" than "maximal" condition (0.89 (SD = 0.63) versus 0.56 (SD = 0.41)). Our results provide insights on biomechanics of the trochanteric soft tissue ("natural" padding device) during impact stage of a fall, suggesting that soft tissues' protective benefits are largely affected by the level of muscle contraction.

引用

页数：5