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Experimental Physiology 91.5 pp 853-866
DOI: 10.1113/expphysiol.2006.033696
© The Physiological Society 2006
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In vivo lumbar erector spinae oxygenation and blood volume measurements in healthy men during seated whole-body vibration

Rammohan V. Maikala1 and Yagesh N. Bhambhani2

1 Liberty Mutual Research Institute for Safety, 71 Frankland Road, Hopkinton, MA 01748, USA 2 Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, T6G 2G4, Canada

Exposure to whole-body vibration is implicated as one of the occupational risk factors for lower back disorders; however, its influence on the lumbar muscle physiology is still poorly understood. The objective of this study was to investigate the effects of backrest support and hand grip contractions on lumbar muscle oxygenation and blood volume responses during seated whole-body vibration using continuous dual-wave near-infrared spectroscopy. Thirteen healthy men were exposed to frequencies of 3, 4.5 and 6 Hz on a vibration simulator, in randomized order on separate days. Each day the duration of the protocol was 30 min. During the fifth minute of vibration ‘with’ and ‘without’ backrest support, participants performed maximal rhythmic hand grip contractions for 1 min. In general, erector spinae oxygenation and blood volume showed a trend to decrease with vibration exposure compared to the control condition. However, these responses were not influenced by the change in vibration frequency (P > 0.05). Sitting without backrest resulted in a greater decrease in oxygenation (by 27%, P = 0.02) and blood volume (by 11%, P = 0.05) than with backrest, implying a deficiency in oxygen supply owing to the sitting posture. Compared to the vibration-only condition, hand grip work decreased both oxygenation (by 22%, P = 0.003) and blood volume responses (by 13%, P = 0.04), suggesting that postural load due to prolonged sitting combined with physical activity during vibration might further burden paraspinal muscles. The influence of adipose tissue thickness of the lumbar muscle on optically derived oxygenation and blood volume changes was inconclusive.

(Received 21 February 2006; accepted after revision 25 May 2006; first published online 1 June 2006)
Corresponding author R. V. Maikala: Liberty Mutual Research Institute for Safety, 71 Frankland Road, Hopkinton, MA 01748, USA. Email: rammohan.maikala{at}libertymutual.com






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Copyright © 2006 by the The Physiological Society.