Volume 27, Issue 2 (Summer-In Press 2026)
jrehab 2026, 27(2): 0-0 |
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orakifar N, Barati F, Mehravar M, Mofateh R, Saki R, Seyedtabib S et al . The Relationship Between Postural Adjustments and Dynamic Balance Control in Individuals with Chronic Nonspecific Low Back Pain. jrehab 2026; 27 (2)
URL: http://rehabilitationj.uswr.ac.ir/article-1-3709-en.html
URL: http://rehabilitationj.uswr.ac.ir/article-1-3709-en.html
Neda Orakifar1 
, Fatemeh Barati2 , Mohammad Mehravar2 , Razieh Mofateh *3 , Ramin Saki4 , Seyedmaryam Seyedtabib5 , Amin Behdarvandan1
, Fatemeh Barati2 , Mohammad Mehravar2 , Razieh Mofateh *3 , Ramin Saki4 , Seyedmaryam Seyedtabib5 , Amin Behdarvandan1
1- Department of Physiotherapy, School of Rehabilitation Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2- Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3- Department of Physiotherapy, School of Rehabilitation Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ,mofatehr@yahoo.com
4- Department of Mechanics, Faculty of Chamran University of Khozestan, Ahvaz, Iran.
5- Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2- Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3- Department of Physiotherapy, School of Rehabilitation Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ,
4- Department of Mechanics, Faculty of Chamran University of Khozestan, Ahvaz, Iran.
5- Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
Abstract: (35 Views)
Objective: Altered motor control is one of the main contributing factors for developing and persisting the low back pain. It is often examined using the concept of postural adjustments and it has at least two components including anticipatory and compensatory postural adjustments. Impaired anticipatory and compensatory postural adjustments have been reported in individuals with chronic low back pain. The relationship between postural adjustment deficits and the ability to maintain balance control during functional activities has not been investigated in individuals with low back pain. Therefore, this study was aimed to investigate the association between postural adjustments and dynamic balance during functional reach test in standing position among individuals with chronic nonspecific low back pain.
Materials & Methods: In this cross sectional study, 25 individuals with chronic nonspecific low back pain, average age 30 years, participated. The participants were recruited by non-probability convenience sampling. Electromyographic activity of the trunk and lower-limb postural muscles, including the transvers abdominus/ internal oblique, erector spine, lateral and medial hamstring and soleus were recorded using surface electromyography. Center of pressure (CoP) displacements using force plate, and displacement during the functional reach test were measured. The level of electrical muscle activity, the delay in onset muscle activity, and the values of medial-lateral (ML) and anterior-posterior (AP) CoP displacement were the main variables studied. The relationship between variables was examined using Pearson's test.
Results: Participants had minimal disability and moderate physical activity level. Results indicated a significant positive relationship between the electrical activity level of medial hamstring muscle during the anticipatory postural adjustment period and the ML CoP displacement (r= 0.38, p-value= 0.019). In addition, lateral hamstring activity level was positively and significantly correlated with ML CoP displacement during compensatory postural adjustment period (r= 0.46, p-value= 0.009). Considering the correlation coefficient (less than 0.50), the extent of these relationships was in the weak range. No other statistically significant relationship was observed.
Conclusion: Altered feedforward and compensatory motor control strategies of lower limb postural muscles in individuals with chronic nonspecific low back pain was correlated with greater CoP displacement in ML direction during functional reach test. Investigation of findings in older adults with low back pain with more disability is suggested.
Materials & Methods: In this cross sectional study, 25 individuals with chronic nonspecific low back pain, average age 30 years, participated. The participants were recruited by non-probability convenience sampling. Electromyographic activity of the trunk and lower-limb postural muscles, including the transvers abdominus/ internal oblique, erector spine, lateral and medial hamstring and soleus were recorded using surface electromyography. Center of pressure (CoP) displacements using force plate, and displacement during the functional reach test were measured. The level of electrical muscle activity, the delay in onset muscle activity, and the values of medial-lateral (ML) and anterior-posterior (AP) CoP displacement were the main variables studied. The relationship between variables was examined using Pearson's test.
Results: Participants had minimal disability and moderate physical activity level. Results indicated a significant positive relationship between the electrical activity level of medial hamstring muscle during the anticipatory postural adjustment period and the ML CoP displacement (r= 0.38, p-value= 0.019). In addition, lateral hamstring activity level was positively and significantly correlated with ML CoP displacement during compensatory postural adjustment period (r= 0.46, p-value= 0.009). Considering the correlation coefficient (less than 0.50), the extent of these relationships was in the weak range. No other statistically significant relationship was observed.
Conclusion: Altered feedforward and compensatory motor control strategies of lower limb postural muscles in individuals with chronic nonspecific low back pain was correlated with greater CoP displacement in ML direction during functional reach test. Investigation of findings in older adults with low back pain with more disability is suggested.
Keywords: Surface electromyography/ Motor control/ Non-specific chronic low back pain / Postural balance
Type of Study: Original |
Subject:
Physical Therapy
Received: 1/12/2025 | Accepted: 13/06/2026 | Published: 12/07/2026
Received: 1/12/2025 | Accepted: 13/06/2026 | Published: 12/07/2026
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This is an open access article distributed under the terms of the Creative Commons Attribution License (CC-By-NC), which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
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