Effects of vibration on arm and shoulder muscles in three body postures
| Autor: | Rolf Helbig, S. Norlander, Henrik Wos, Walter Rohmert |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Adult
Male Shoulder medicine.medical_specialty Physiology Posture Infraspinatus muscle Electromyography Vibration Biceps Physical medicine and rehabilitation Voluntary contraction Muscular Diseases Physiology (medical) medicine Humans Orthopedics and Sports Medicine medicine.diagnostic_test business.industry Muscles Public Health Environmental and Occupational Health Body movement General Medicine Anatomy Occupational Diseases Arm medicine.symptom Trapezius muscle business Neck Muscle contraction |
| Zdroj: | European Journal of Applied Physiology and Occupational Physiology. 59:243-248 |
| ISSN: | 1439-6327 0301-5548 |
| DOI: | 10.1007/bf02388323 |
| Popis: | The electromyographic responses of arm and shoulder muscles to vibrations were studied in three postures similar to the postures of drilling in a ceiling, drilling in a wall and drilling in a floor. This experiment was performed within the defined parameters of: vibrational frequency at 30 Hz, acceleration level 40 m.s-2 (rms), pushing force expressed as percentage maximal voluntary contraction, and gripping force which was set at 100 N. The exposure time for each test was 5 min. The general findings from these three body postures show that all the examined muscles were affected by exposure to vibration. The EMG index increased as follows: trapezius muscle 39% (p less than 0.05), lower-arm flexor muscles 23% (p less than 0.05), infraspinatus muscle 14% (p less than 0.05), lower-arm extensor muscles 14% (p less than 0.1) and biceps muscle 6% (p less than 0.1). The muscle most affected by vibration was found to be the trapezius muscle. It should be taken into consideration that vibration can be a contributing factor in neck/shoulder disorders among power handtool operators. The general conclusion from this study is that changes in working posture give different transmissions of vibration in the upper extremities. It seems as if the prime movers and muscles with an increased muscle length or increased degree of contraction are most affected by vibration. |
| Databáze: | OpenAIRE |
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