The Relationship between Physical Function and Postural Sway during Local Vibratory Stimulation of Middle-aged People in the Standing Position

Abstract

[Purpose] The purpose of this study was to examine the relationship between physical function and postural sway during local vibratory stimulation of middle-aged subjects in an upright position. [Subjects] The subjects were 25 healthy community-dwelling middle-aged people. [Methods] We measured postural sway using a Wii board while vibratory stimulations of 30, 60, or 240 Hz were applied to the subjects’ lumbar multifidus or gastrocnemius muscles. Physical function was evaluated by 5-m usual gait speed and grip strength. [Results] Gait speed was strongly correlated to the anteroposterior body sway in the upright position during 30 Hz gastrocnemius muscles vibration (GMV). [Conclusion] Postural sway during 30 Hz GMV was strongly associated with gait speed and showed a posterior displacement. These findings show that the lower leg’s response to balance control under 30 Hz proprioceptive stimulation might be a good indicator of declining gait function.

Relationship between paraspinal muscle cross-sectional area and relative proprioceptive weighting ratio of older persons with lumbar spondylosis

“…We defined the change in anteroposterior displacement of the CoP as follows: ΔY = Y(During) − Y(Pre), where Y is the displacement of the Y-coordinate of the CoP recorded by the Wii Balance Board, and Y(Pre) and Y(During) are the mean values of the time series of Y data for the first and last 15 s, respectively. These calculations were performed using a program we wrote using Matlab (MathWorks, Inc., Natick, MA, USA) 7 ) . Multiple linear regression analysis was used to examine whether the RPW ratio was associated with back strength, abdominal muscle strength, erector spinae muscle (L1/L2, L4/L5) cross-sectional area, or lumbar multifidus (L1/L2, L4/L5) cross-sectional area.…”

“…Therefore, a vibratory stimulus that matches the response frequency of the receptors present in skeletal muscle may influence postural stability and trunk mobility. The representative receptor and response frequencies are 30 Hz in Meissner’s corpuscles, 60 Hz in muscle spindles, and 240 Hz in Vater-Pacini corpuscles 7 ) .…”

Comprehensive Physical Function Assessment in Elderly People

“…Also, according to other study, the impairment of back muscle strength leads to the motor function and sensory deficit that affects balance performance [58]. Moreover, according to another study, the lower leg's response to balance control under 30 Hz proprioceptive stimulation might be a good indicator of declining gait function [59].…”

Relationship Between Postural Stability and Falls Risk in Elderly People with Lumbar Spondylosis During Local Vibratory Stimulation for Proprioception: A Cross-sectional Study

“…Characteristics of postural stability were measured using a Balance Board (Wii, Nintendo Co., Ltd., Kyoto, Japan) [9,[14][15][16]. Balance Board data were acquired using a sampling frequency at 100 Hz and calculated by Matlab (MathWorks, Inc., Natick, MA, USA) using a low-pass filter with a cutoff frequency at 20 Hz.…”