Increased Postural Sway in Control Subjects With Poor Orthostatic Tolerance
Victoria E. Claydon, PhD* and
Roger Hainsworth, MB, PhD, DSc
University of Leeds, Institute for Cardiovascular Research, Leeds, United Kingdom
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Figure 1 (A) Maximum vascular resistance response to orthostatic stress in the two groups and (B) correlation between the maximum vascular resistance response to orthostatic stress and orthostatic tolerance (OT). The maximum vascular resistance response was expressed as percentage change from the supine level. There was a trend for the maximum vascular resistance response to be larger in the group with good orthostatic tolerance, but this was not statistically significant (A). There was a significant positive correlation between the maximum vascular resistance response and orthostatic tolerance (B).
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Figure 2 Distance and velocity of movement after 10 min of standing. The distance moved anteroposteriorly and the total distance moved were significantly greater in those with poor orthostatic tolerance (OT) (A). The velocity of movement anteroposteriorly and the mean velocity of movements were also significantly greater in those with poor orthostatic tolerance (B). Open bars = good OT; solid bars = poor OT.
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Figure 3 Correlation between the distance and velocity of movement after 10 min of standing and orthostatic tolerance. There was a significant correlation between the distance moved anteroposteriorly (A) and the velocity of movement in the anteroposterior direction (B) and orthostatic tolerance.
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Figure 4 Correlation between the distance and velocity of movement after five minutes of standing and the maximum vascular resistance response to the orthostatic stress. There was a significant correlation between the distance moved anteroposteriorly (A) and the velocity of movement in the anteroposterior direction (B) and the maximum forearm vascular resistance response.
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