The functional roles of muscles during sloped walking

JOURNAL OF BIOMECHANICS

卷:49

Article

Pickle, Nathaniel T.¹  Grabowski, Alena M.^2,3  Auyang, Arick G.⁴  Silverman, Anne K.¹ 

[1] Colorado Sch Mines, Dept Mech Engn, 1500 Illinois St, Golden, CO 80401 USA

[2] Univ Colorado, Dept Integrat Physiol, Boulder, CO 80309 USA

[3] VA Eastern Colorado Healthcare Syst, Denver, CO 80220 USA

[4] Nike Explore Team Sports Res Lab, Beaverton, OR 97005 USA

关键词: Biomechanics;    Incline;    Decline;    Gait;    Modeling and simulation;   

DOI  :  10.1016/j.jbiomech.2016.08.004

来源: Elsevier

【 摘 要 】

Sloped walking is biomechanically different from level-ground walking, as evidenced by changes in joint kinematics and kinetics. However, the changes in muscle functional roles underlying these altered movement patterns have not been established. In this study, we developed a total of 273 muscle actuated simulations to assess muscle functional roles, quantified by induced body center-of-mass accelerations and trunk and leg power, during walking on slopes of 0 degrees, +/- 3 degrees, +/- 6 degrees, and +/- 9 degrees at 1.25 m/s. The soleus and gastrocnemius both provided greater forward acceleration of the body parallel to the slope at +9 degrees compared to level ground ( +126% and +66%, respectively). However, while the power delivered to the trunk by the soleus varied with slope, the magnitude of net power delivered to the trunk and ipsilateral leg by the biarticular gastrocnemius was similar across all slopes. At +9 degrees, the hip extensors absorbed more power from the trunk (230% hamstrings, 140% gluteus maximus) and generated more power to both legs (200% hamstrings, 160% gluteus maximus) compared to level ground. At 9, the knee extensors (rectus femoris and vasti) accelerated the body upward perpendicular to the slope at least 50% more and backward parallel to the slope twice as much as on level ground. In addition, the knee extensors absorbed greater amounts of power from the ipsilateral leg on greater declines to control descent. Future studies can use these results to develop targeted rehabilitation programs and assistive devices aimed at restoring sloped walking ability in impaired populations. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free