Neuroscience 2002 Abstract
| Presentation Number: | 365.9 |
|---|---|
| Abstract Title: | INCREASING LEVELS OF PRESSURE TO THE SOLE MODIFY NEUROMUSCULAR ACTIVATION. |
| Authors: |
Baxter, M. F.*1
; Layne, C. S.1
1Health and Human Performance, University of Houston, Houston, TX |
| Primary Theme and Topics |
Motor Systems - Control of Posture and Movement -- EMG Activity |
| Secondary Theme and Topics | Sensory Systems<br />- Tactile/Somatosensory |
| Session: |
365. Control of posture and movement: sensorimotor integration II Poster |
| Presentation Time: | Monday, November 4, 2002 1:00 PM-2:00 PM |
| Location: | Hall A2-B3 H-13 |
| Keywords: | MOTOR ACTIVITY, SOMATOSENSORY, POSTURE |
The effects of cutaneous stimulation on muscle activation range from enhancement to inhibition. Layne et al.,(2000) have shown that stimulation to the sole increases muscle activation in microgravity and 1g. The purpose of this investigation was to determine if stimulation to the sole similarly modified muscle activation when muscles were functioning in a postural or voluntary role. A second goal was to investigate if increasing levels of stimulation modified the magnitude of muscle activation. The TA was monitored using surface EMG during ankle dorsiflexion to investigate activation when a muscle was serving as the prime mover. Several lower limb muscles were monitored during rapid arm raises to investigate neuromuscular responses of muscles traditionally serving bipedal postural control functions. Both movements were completed in supine with four levels of pressure (0, 8, 16 and 24 psi) applied to the sole between 100 and 50 ms prior to the onset of the prime mover. The rapid arm raise was also completed in standing as a baseline condition. The data were analyzed with repeated measures ANOVA. To evaluate the relationship between levels of stimulation and EMG activation, trend analysis was performed. During voluntary dorsiflexion, the TA displayed a significant increase above the control condition at 24 psi. During the rapid arm raise, there was a trend towards increased activation with increased pressure levels. The data suggests that non-specific mechanical stimulation of the soles can enhance ongoing muscle activation in prime movement or postural activity but that there may be a threshold of stimulation that is required before the response is observed.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2002 Neuroscience Meeting Planner. Orlando, FL: Society for Neuroscience, 2002. Online.
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