Abstracts » Business

Effects of seated posture on erector spinae EMG activity during whole body vibration

Article Abstract:

A study was conducted to assess the response of the erector spinae to WBV in three different postures, upright, forward lean and posterior lean. Since the spine is an area that is most often overtaxed in jobs that involve whole body vibration (WBV), it deserves in-depth inquiry. Eleven male graduate students took part in the study. Proper body posture is a requisite to combat the straining effects of WBV. Erector spinae response is greater for the anterior and neutral postures than for the posterior posture. Mechanical overloading due to WBV decreases the flow of nutrients into the invertebral disc.

Posture, Vibration, Vibration (Physics), Spine

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Spectral analysis of erector spinae EMG during intermittent isometric fatiguing exercise

Article Abstract:

Low back pains (LBP) is one of the most common complaints in industrialized countries. LBP is associated with manually lifting heavy loads. Seven healthy male students participated in the study to determine the applicability of electromyographic (EMG) spectral analysis on muscular fatigue of the erector spinae. The multifidus muscle appeared to demostrate the most consistent changes in the EMG power spectrum as a result of fatigue. Fatigue of the erector spinae muscles is associated with low back pains. Spectral analysis may be used to compare health risks in different lifting tasks.

Research, Usage, Injuries, Backache, Back pain, Fatigue, Spectrum analysis, Spectroscopy, Back

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Lumbar erector spinae oxygenation during prolonged contractions: implications for prolonged work

Article Abstract:

Back muscle oxygenation during prolonged isometric contractions is reduced, even at contraction intensity as low as 2 percent of maximum voluntary contraction. The finding has implications for occupational conditions.

Health aspects, Occupational diseases, Muscle strength

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