Effects of level of multiple sclerosis involvement on biomechanics of sit-to-stand
Thompson, Ryan Patrick
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The purposes of the study were to describe the mechanics of the sit-to-stand as performed by individuals with multiple sclerosis (MS), and to determine how the level of MS involvement influences movement and muscle activation strategies selected during standing. Eleven participants were divided into three MS involvement groups, based on the Expanded Disability Status Scale: very mild (0.5-3.0), mild (3.5-4.5), and moderate (5.0-6.0); (n = 6, 3, and 2, respectively). Participants performed six trials of the sit-to-stand movement. Group differences for two-dimensional kinematic, ground reaction force and electromyographic variables were determined using the Kruskal-Wallis test (± = 0.05). No statistical differences were detected, likely due to high intra- and inter-individual variation and small sample size. As a group, the MS participants showed common strategies for muscle activation and control of joint extension velocities. The moderate MS group times during phases were comparable to other neurological populations.