Document Type : RESEARCH PAPER
Authors
1
1 Clinical Research Development Center of Rofeideh Rehabilitation Hospital, Tehran, Iran 2 Physiotherapy Department, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
2
KITE Research Institute, Toronto Rehabilitation Institute, University Health Network, , Toronto, Canada
3
Department of Biostatistics and Epidemiology, Substance Abuse and Dependence Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
4
Physiotherapy Department, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
Abstract
Objectives: While cervical proprioception deficit has been suggested as a contributing factor to clinical
consequences of chronic non-specific neck pain (CNSNP), the effect of addressing such impairments
on postural control strategies has remained unexplored. The aim of this study was to compare the
response of the postural control system to alteration of sensory afferents in CNSNP with asymptomatic
individuals. Furthermore, we examined whether proprioceptive training would yield superior outcomes
to routine physiotherapy for improvement of postural control, pain and disabi lity.
Methods: Center of pressure (CoP) variables of sixty CNSNP patients equally distributed in any of the
proprioception-specific or conventional physiotherapy groups and 30 asymptomatic participants were evaluated
under four standing conditions:1) normal, 2) foam, 3) cervical extension/eyes open and 4) cervical extension/eyes
closed standing.
Results: CoP anteroposterior range and anteroposterior and mediolateral velocity in patients were significantly
higher than the control group under condition 2 (P<0.05). Patients also demonstrated lower anteroposterior lyapunov
exponent under conditions 2 and 4 (P<0.05). Both interventions significantly decreased anteroposterior range and
anteroposterior velocity(P<0.05). Anteroposterior lyapunov exponent also increased under condition 2 (P<0.05)..
After the interventions, CoP anteroposterior range and anteroposterior velocity were significantly lower in the
proprioceptive exercise group than the conventional physiotherapy group (P<0.05). Anteroposterior lyapunov
exponent was also significantly higher in the proprioceptive exercise group (P<0.05).This while there was no
significant difference between these patients and control group participants in any of the CoP variables after
intervention.
Conclusion: Our results rejected the hypothesis that impaired neck proprioception in the presence of CNSNP is
compensated by overweighting other sources of sensory afferent information. The findings also revealed that while
proprioceptive exercises successfully returned postural strategies of CNSNP patients to those in asymptomatic
participants, they do not add to clinical recovery of these patients.
Level of evidence: I
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