Abstract：
:Healthy young and elderly adults were asked to actively modulate neck muscle stiffness during random rotations of the trunk in the vertical plane. Angular velocity of head with respect to trunk and myoelectric activity of semispinalis capitis and sternocleidomastoid muscles were recorded. A MANOVA was performed on group, condition, and frequency variables. A gain and phase drop at 2.15 Hz in young adults indicated neural (i.e. reflex) damping of system mechanics. In the elderly, a steady rise in gain and drop in phase (P<0.0002) was indicative of a second order underdamped system. Even when instructed to not intervene elderly subjects exhibited cocontraction. Ineffective reflex mechanisms may underlie the emergence of this strategy.
journal_name
Gait Posturejournal_title
Gait & postureauthors
Keshner EAdoi
10.1016/s0966-6362(99)00046-6subject
Has Abstractpub_date
2000-02-01 00:00:00pages
1-11issue
1eissn
0966-6362issn
1879-2219pii
S0966-6362(99)00046-6journal_volume
11pub_type
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