Simulation 2 Effect of short-latency moment on upper body across flexible hip.mp4 (727.18 kB)View fileThis item contains files with download restrictions
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Simulation 3 Effect of short-latency moments on upper body across flexible knee.mp4 (758.5 kB)View fileThis item contains files with download restrictions
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Simulation 4 Effect of short-latency moment on upper body across flexible lower-limb.mp4 (736.32 kB)View fileThis item contains files with download restrictions
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Simulation 5 Effect of neck moment on head and body below the neck.mp4 (557.57 kB)View fileThis item contains files with download restrictions
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Dataset for: The Effect of Fear of Falling on Vestibular Feedback Control of Balance
posted on 2017-10-06, 07:43authored byJonathan L. A. de Melker Worms, John F Stins, Peter J Beek, Ian D. Loram
Vestibular sensation contributes to cervical-head stabilisation and fall prevention. To
what extent fear of falling influences the associated vestibular feedback processes is
currently undetermined. We used galvanic vestibular stimulation (GVS) to induce
vestibular reflexes while participants stood at ground level and on a narrow walkway
at 3.85 m height to induce fear of falling. Fear was confirmed by questionnaires and
elevated skin conductance. Full-body kinematics was measured to differentiate the
whole-body centre of mass response (CoM) into component parts (cervical, axial trunk,
appendicular short-latency and medium-latency). We studied the effect of fear of falling
on each component to discern their underlying mechanisms. Statistical parametric
mapping analysis provided sensitive discrimination of early GVS and height effects.
Kinematic analysis revealed responses at 1 mA stimulation previously believed
marginal through EMG and force plate analysis. The GVS response comprised a rapid,
anode-directed cervical-head acceleration, a short-latency cathode-directed
acceleration (cathodal-buckling) of lower extremities and pelvis, an anode-directed
upper thorax acceleration and subsequently a medium-latency anode-directed
acceleration of all body parts. At height, head and upper thorax early acceleration were
unaltered, however short-latency lower extremity acceleration was increased. The
effect of height on balance was a decreased duration and increased rate of change of
the CoM acceleration pattern. These results demonstrate that fear modifies vestibular
control of balance, whereas cervical-head stabilisation is governed by different
mechanisms unaffected by fear of falling. The mechanical pattern of cathodal-buckling,
and its modulation by fear of falling both support the hypothesis that short-latency
responses contribute to regulate balance.