The effects of eccentric exercise on surface electromyographic parameters of the lumbar paraspinal muscles /
The present investigation was designed to assess lumbar paraspinal muscle function during different contraction modes and intensities in subjects with and without low back pain (LBP). The first experiment evaluated the effects of a single bout of eccentric contractions on torque and electromyographi...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2000.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=728331891&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The present investigation was designed to assess lumbar paraspinal muscle function during different contraction modes and intensities in subjects with and without low back pain (LBP). The first experiment evaluated the effects of a single bout of eccentric contractions on torque and electromyographic (EMG) variables both during the exercise bout and for seven days after the bout. Decrements in torque were noted during the exercise bout, however no sustained decrement in torque production was observed. Increased EMG activity for a given level of torque was observed after the exercise protocol but returned to baseline levels by Day 3. Contrary to studies performed using limb muscles, no long term alteration in lumbar paraspinal muscle function was observed. The second experiment compared torque and EMG variables in subjects with and without LBP. A secondary purpose was to document differences in EMG characteristics between the iliocostalis lumborum muscle and the multifidus muscle. No differences were noted between the two groups of subjects for any of the variables. However, differences were noted between the two muscles. The multifidus muscle exhibited higher levels of EMG activity compared to the iliocostalis lumborum muscle during isometric trunk extension. This is consistent with its primary biomechanical role as a trunk extensor. The multifidus muscle was also noted to be more fatigable than the iliocostalis lumborum muscle evidenced by a more negative EMG median frequency slope during a sustained contraction. In addition, median frequency for the multifidus muscle was higher compared to the iliocostalis lumborum muscle. The results are discussed in light of anatomical and physiological differences between the two muscles. |
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| Item Description: | Vita. "Major Subject: Kinesiology". |
| Physical Description: | xi, 139 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 103-120). |