Changes in lumbar disk morphology associated with prolonged sitting assessed by magnetic resonance imaging

Gregory Billy, Susan K. Lemieux, Mosuk Chow

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

To determine what if any changes occur to the lumbar disks in the spine after prolonged sitting with and without intermittent breaks during a 4-hour period. Design: A prospective observational study. Setting: An academic outpatient clinic. Methods: The measurement of lumbar disk changes was performed with 12 subjects after an analysis of a mid sagittal lumbar magnetic resonance image, which measured lumbar disk height and disk diameter. Scanning and analysis were done over a 2-day period: day 1 at the start of the work day and 4 hours later after continuous sitting; at the start of work day 2 and after four hours after a change in position and stretching protocol every 15 minutes. Results: For this study, we first evaluated each level of the lumbar spine for any changes after prolonged sitting for 4 hours over the 2 days. Multiple comparisons bias was eliminated by a Bonferroni correction to limit the overall experiment-wise error rate to .05. The comparison was conducted by using a paired t-test when the normality condition was satisfied and by using a Wilcoxon signed rank test when normality was not satisfied. To test for normality, a Shapiro-Wilk test was used. We found that, for disk height, L4-5 was significantly decreased at the end of the sitting for day 1 but not for day 2. There were no significant height changes for the other lumbar disks. In addition, for disk diameter, there were no significant differences present for any of the disks. Conclusions: Analysis of the data shows that the greatest change in disk height is at the L4-5 level after prolonged sitting without intermittent breaks. The other levels did not show a significant change in their height. The findings also showed that the L4-5 height changes were not significant with brief positional changes every 15 minutes. Fewer changes in disk height may correlate with an improvement in low back pain and disability.

Original languageEnglish (US)
Pages (from-to)790-795
Number of pages6
JournalPM and R
Volume6
Issue number9
DOIs
StatePublished - Sep 1 2014

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Spine
Magnetic Resonance Imaging
Nonparametric Statistics
Low Back Pain
Ambulatory Care Facilities
Observational Studies
Magnetic Resonance Spectroscopy
Prospective Studies

All Science Journal Classification (ASJC) codes

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Neurology
  • Clinical Neurology

Cite this

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abstract = "To determine what if any changes occur to the lumbar disks in the spine after prolonged sitting with and without intermittent breaks during a 4-hour period. Design: A prospective observational study. Setting: An academic outpatient clinic. Methods: The measurement of lumbar disk changes was performed with 12 subjects after an analysis of a mid sagittal lumbar magnetic resonance image, which measured lumbar disk height and disk diameter. Scanning and analysis were done over a 2-day period: day 1 at the start of the work day and 4 hours later after continuous sitting; at the start of work day 2 and after four hours after a change in position and stretching protocol every 15 minutes. Results: For this study, we first evaluated each level of the lumbar spine for any changes after prolonged sitting for 4 hours over the 2 days. Multiple comparisons bias was eliminated by a Bonferroni correction to limit the overall experiment-wise error rate to .05. The comparison was conducted by using a paired t-test when the normality condition was satisfied and by using a Wilcoxon signed rank test when normality was not satisfied. To test for normality, a Shapiro-Wilk test was used. We found that, for disk height, L4-5 was significantly decreased at the end of the sitting for day 1 but not for day 2. There were no significant height changes for the other lumbar disks. In addition, for disk diameter, there were no significant differences present for any of the disks. Conclusions: Analysis of the data shows that the greatest change in disk height is at the L4-5 level after prolonged sitting without intermittent breaks. The other levels did not show a significant change in their height. The findings also showed that the L4-5 height changes were not significant with brief positional changes every 15 minutes. Fewer changes in disk height may correlate with an improvement in low back pain and disability.",
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Changes in lumbar disk morphology associated with prolonged sitting assessed by magnetic resonance imaging. / Billy, Gregory; Lemieux, Susan K.; Chow, Mosuk.

In: PM and R, Vol. 6, No. 9, 01.09.2014, p. 790-795.

Research output: Contribution to journalArticle

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AU - Chow, Mosuk

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