Neuroscience 2001 Abstract
| Presentation Number: | 167.7 |
|---|---|
| Abstract Title: | MAGNETIC RESONANCE IMAGING T2 TIMES OF LEG MUSCLES: UNILATERAL VERSUS BILATERAL HEEL RAISES. |
| Authors: |
Segal, R. L.*1,2
; Song, A. W-.3
; Hopkins, K.4
1Div. Phys. Ther., Emory Univ Sch Med, Atlanta, GA 2Dept. Rehab. Med., Emory Univ Sch Med, Atlanta, GA 3Brain Imaging and Analysis Center, Duke University, Durham, NC 4Department of Radiology, Emory Univ. Sch. Med., Atlanta, GA |
| Primary Theme and Topics |
Motor Systems - Muscle and Motor Unit |
| Secondary Theme and Topics | Motor Systems<br />- Control of Posture and Movement<br />-- EMG Activity |
| Session: |
167. Muscle and motor unit: muscle structure Poster |
| Presentation Time: | Sunday, November 11, 2001 3:00 PM-4:00 PM |
| Location: | Exhibit Hall Q-10 |
| Keywords: | Triceps surae, Gastrocnemii, Soleus |
Muscles that would be predicted to have the same functions may have different functions when examined in detail. For example, the lateral gastrocnemius (LG) and medial gastrocnemius (MG) muscles appear to be differentially activated during turning while walking and also during unilateral heel raises.To further examine the relative activity of leg muscles we compared the activity of muscles used during unilateral heel raises versus bilateral heel raises using T2 weighted MR images. Subjects were scanned prior to and after performing 60-100 s of bilateral and/or unilateral heel raises at a rate of 1 per 2 s. There was at least a 40 minute rest period between exercise epochs. For both bilateral and unilateral heel raises, whether analyzing whole muscles or if the muscles are divided into proximal, middle and distal portions, the peroneal (PER) muscles are the most active. Typically, MG is next most active followed by LG. The soleus (SOL) is not very active during bilateral heel raises, but increases to levels similar to LG during unilateral heel raises. We preliminarily conclude that the leg muscles are differentially activated during heel raises with activity of most muscles proportionally increasing when going from bilateral to unilateral heel raises. The lone exception is SOL which has a larger increase in activity when going from bilateral to unilateral heel raises.
Supported by NICHD NCMRR grant HD 32571
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2001 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2001. Online.
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