Teng Hsiang-Ling, Powers Christopher M
Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA.
Med Sci Sports Exerc. 2015 Mar;47(3):625-30. doi: 10.1249/MSS.0000000000000436.
This study aimed to examine the influence of sagittal plane trunk posture on lower extremity energetics during running.
Forty asymptomatic recreational runners (20 males and 20 females) ran overground at a speed of 3.4 m·s(-1). Sagittal plane trunk kinematics and lower extremity kinematics and energetics during the stance phase of running were computed. Subjects were dichotomized into high flexion (HF) and low flexion (LF) groups on the basis of the mean trunk flexion angle.
The mean (±SD) trunk flexion angles of the HF and LF groups were 10.8° ± 2.2° and 3.6° ± 2.8°, respectively. When compared with the LF group, the HF group demonstrated significantly higher hip extensor energy generation (0.12 ± 0.06 vs 0.05 ± 0.04 J·kg(-1), P < 0.001) and lower knee extensor energy absorption (0.60 ± 0.14 vs 0.74 ± 0.09 J·kg(-1), P = 0.001) and generation (0.30 ± 0.05 vs 0.34 ± 0.06 J·kg(-1), P = 0.02). There was no significant group difference for the ankle plantarflexor energy absorption or generation (P > 0.05).
Sagittal plane trunk flexion has a significant influence on hip and knee energetics during running. Increasing forward trunk lean during running may be used as a strategy to reduce knee loading without increasing the biomechanical demand at the ankle plantarflexors.
本研究旨在探讨矢状面躯干姿势对跑步过程中下肢能量消耗的影响。
40名无症状的业余跑步者（20名男性和20名女性）以3.4 m·s(-1)的速度在地面上跑步。计算跑步支撑阶段的矢状面躯干运动学、下肢运动学和能量消耗。根据平均躯干屈曲角度将受试者分为高屈曲（HF）组和低屈曲（LF）组。
HF组和LF组的平均（±标准差）躯干屈曲角度分别为10.8°±2.2°和3.6°±2.8°。与LF组相比，HF组的髋伸肌能量产生显著更高（0.12±0.06 vs 0.05±0.04 J·kg(-1)，P<0.001），而膝伸肌能量吸收更低（0.60±0.14 vs 0.74±0.09 J·kg(-1)，P = 0.001）且能量产生更低（0.30±0.05 vs 0.34±0.06 J·kg(-1)，P = 0.02）。踝关节跖屈肌能量吸收或产生在两组间无显著差异（P>0.05）。
矢状面躯干屈曲对跑步过程中的髋部和膝部能量消耗有显著影响。跑步时增加躯干前倾可作为一种策略，在不增加踝关节跖屈肌生物力学需求的情况下减少膝关节负荷。
