The effect of lumbar spine manipulation on biomechanical factors and perceived transient pain during prolonged sitting: A laboratory-controlled cross-sectional study

Author:

De Carvalho Diana E,Callaghan Jack1

Affiliation:

1. University of Waterloo Faculty of Applied Health Sciences

Abstract

Abstract Background: Spine manipulation has been shown to affect muscle activity, posture, and pain. To date, no studies have examined the effect of manipulation on biomechanical factors during sitting. Therefore, the purpose of this study was to investigate the immediate effect of lumbar spine manipulation on trunk muscle activation, spine posture and movements, and perceived ratings of transient pain in asymptomatic adults during prolonged office sitting.Methods: Twenty healthy adults were recruited for a single laboratory session that included a standardized office sitting/data entry protocol (120 minutes total, 3 blocks of 40 minutes). Data were collected between July and August 2012. The first block (baseline) was immediately followed by two experimental blocks. Prior to the start of each experimental block, participants were transferred to a therapy plinth and placed side lying (right side down), and a random presentation of either a control or high velocity low amplitude thrust directed at L4/L5 was delivered. Continuous measures of muscle activity, spine posture, and spine movements were recorded throughout the sitting trials. Perceived transient pain was measured by visual analogue scale at 7.5-minute intervals (including immediately before and after the randomized maneuvers).Results: There were no significant differences in spine or pelvic posture or perceived back pain following either the manipulation or control maneuvers. Significantly reduced muscle activity and increased shifts of the lumbar spine angle were identified in the block following manipulation compared to both baseline and post control blocks. Conclusions: Spine manipulation does not appear to have an immediate impact on spine or pelvic posture but does appear to reduce muscle activity and increase spine movement during sitting. Neither manipulation nor the control maneuver provided significant reductions in perceived transient pain. Future work should replicate this study with a larger population in a field study. It may be worthwhile to explore the implication of reduced muscle activation and increased spine movements during prolonged sitting for office workers that receive manipulations or mobilizations during their workday.

Publisher

Research Square Platform LLC

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