Abstract
Background: Preprogrammed reactions (PPR) appear at a latency of higher than 40 ms, but before the voluntary muscle responds (∼ 120 ms) to postural perturbations. Objective: To examine the difference in magnitude of preprogrammed reactions in patients with chronic low back pain (CLBP) and without low back pain. Methods: we analyzed electromyographic Root Mean Square (RMS) amplitudes of asymptomatic (n = 25) and CLBP patients (n = 25) on stable and unstable surfaces during expected and unexpected perturbations for rectus abdominus and erector spinae muscles. The mean PPR and PPR-combined voluntary response RMS amplitudes (VRPPR) were compared between the two groups. To find the presence of PPR in LBP patients, a criteria was set that the obtained PPR RMS amplitude value should exceed 60% mean reflex RMS amplitude that occur within 50 ms after perturbation. Results: Fleiss' kappa revealed a good agreement (κ = 0.7 to 0.9) among raters for absence of PPR in patients with CLBP and presence of PPR in asymptomatic population. The two way ANOVA revealed significantly different mean PPR and VRPPR RMS amplitudes between asymptomatic and LBP population for rectus abdominus and erector spinae muscles (p< 0.05). Conclusion: PPR responses were found absent (< 60% of Mean Reflex RMS) in patients with CLBP. Further, patients with CLBP demonstrated lower PPR amplitudes with higher peak voluntary responses compared to asymptomatic population, indicating difficulties in presetting of voluntary responses for regaining postural stability after perturbation.
| Original language | English |
|---|---|
| Pages (from-to) | 77-86 |
| Number of pages | 10 |
| Journal | Journal of Back and Musculoskeletal Rehabilitation |
| Volume | 23 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 01-01-2010 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation
- Rehabilitation
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The magnitude of pre-programmed reaction dysfunction in back pain patients : Experimental pilot electromyography study. / Ramprasad, M.; Shenoy, D. Shweta; Singh, Sandhu Jaspal; Sankara, N.; Joseley, S. R.P.
In: Journal of Back and Musculoskeletal Rehabilitation, Vol. 23, No. 2, 01.01.2010, p. 77-86.Research output: Contribution to journal › Article
TY - JOUR
T1 - The magnitude of pre-programmed reaction dysfunction in back pain patients
T2 - Experimental pilot electromyography study
AU - Ramprasad, M.
AU - Shenoy, D. Shweta
AU - Singh, Sandhu Jaspal
AU - Sankara, N.
AU - Joseley, S. R.P.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - Background: Preprogrammed reactions (PPR) appear at a latency of higher than 40 ms, but before the voluntary muscle responds (∼ 120 ms) to postural perturbations. Objective: To examine the difference in magnitude of preprogrammed reactions in patients with chronic low back pain (CLBP) and without low back pain. Methods: we analyzed electromyographic Root Mean Square (RMS) amplitudes of asymptomatic (n = 25) and CLBP patients (n = 25) on stable and unstable surfaces during expected and unexpected perturbations for rectus abdominus and erector spinae muscles. The mean PPR and PPR-combined voluntary response RMS amplitudes (VRPPR) were compared between the two groups. To find the presence of PPR in LBP patients, a criteria was set that the obtained PPR RMS amplitude value should exceed 60% mean reflex RMS amplitude that occur within 50 ms after perturbation. Results: Fleiss' kappa revealed a good agreement (κ = 0.7 to 0.9) among raters for absence of PPR in patients with CLBP and presence of PPR in asymptomatic population. The two way ANOVA revealed significantly different mean PPR and VRPPR RMS amplitudes between asymptomatic and LBP population for rectus abdominus and erector spinae muscles (p< 0.05). Conclusion: PPR responses were found absent (< 60% of Mean Reflex RMS) in patients with CLBP. Further, patients with CLBP demonstrated lower PPR amplitudes with higher peak voluntary responses compared to asymptomatic population, indicating difficulties in presetting of voluntary responses for regaining postural stability after perturbation.
AB - Background: Preprogrammed reactions (PPR) appear at a latency of higher than 40 ms, but before the voluntary muscle responds (∼ 120 ms) to postural perturbations. Objective: To examine the difference in magnitude of preprogrammed reactions in patients with chronic low back pain (CLBP) and without low back pain. Methods: we analyzed electromyographic Root Mean Square (RMS) amplitudes of asymptomatic (n = 25) and CLBP patients (n = 25) on stable and unstable surfaces during expected and unexpected perturbations for rectus abdominus and erector spinae muscles. The mean PPR and PPR-combined voluntary response RMS amplitudes (VRPPR) were compared between the two groups. To find the presence of PPR in LBP patients, a criteria was set that the obtained PPR RMS amplitude value should exceed 60% mean reflex RMS amplitude that occur within 50 ms after perturbation. Results: Fleiss' kappa revealed a good agreement (κ = 0.7 to 0.9) among raters for absence of PPR in patients with CLBP and presence of PPR in asymptomatic population. The two way ANOVA revealed significantly different mean PPR and VRPPR RMS amplitudes between asymptomatic and LBP population for rectus abdominus and erector spinae muscles (p< 0.05). Conclusion: PPR responses were found absent (< 60% of Mean Reflex RMS) in patients with CLBP. Further, patients with CLBP demonstrated lower PPR amplitudes with higher peak voluntary responses compared to asymptomatic population, indicating difficulties in presetting of voluntary responses for regaining postural stability after perturbation.
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U2 - 10.3233/BMR-2010-0254
DO - 10.3233/BMR-2010-0254
M3 - Article
VL - 23
SP - 77
EP - 86
JO - Journal of Back and Musculoskeletal Rehabilitation
JF - Journal of Back and Musculoskeletal Rehabilitation
SN - 1053-8127
IS - 2
ER -