Abstract
Background Little is known about the effects of use of a cane on balance during perturbed gait or whether people with Parkinson disease (PD) benefit from using a cane.
Objectives The purpose of this study was to evaluate the effects of cane use on postural recovery from a slip due to repeated surface perturbations in individuals with PD compared with age- and sex-matched individuals who were healthy.
Design This was a prospective study with 2 groups of participants.
Methods Fourteen individuals with PD (PD group) and 11 individuals without PD (control group) walked across a platform that translated 15 cm rightward at 30 cm/s during the single-limb support phase of the right foot. Data from 15 trials in 2 conditions (ie, with and without an instrumented cane in the right hand) were collected in random order. Outcome measures included lateral displacement of body center of mass (COM) due to the slip and compensatory step width and length after the perturbation.
Results Cane use improved postural recovery from the first untrained slip, characterized by smaller lateral COM displacement, in the PD group but not in the control group. The beneficial effect of cane use, however, occurred only during the first perturbation, and those individuals in the PD group who demonstrated the largest COM displacement without a cane benefited the most from use of a cane. Both PD and control groups gradually decreased lateral COM displacement across slip exposures, but a slower learning rate was evident in the PD group participants, who required 6, rather than 3, trials for adapting balance recovery.
Limitations Future studies are needed to examine the long-term effects of repeated slip training in people with PD.
Conclusions Use of a cane improved postural recovery from an unpracticed slip in individuals with PD. Balance in people with PD can be improved by training with repeated exposures to perturbations.
Footnotes
Dr Boonsinsukh, Dr Carlson-Kuhta, and Dr Horak provided concept/idea/research design, writing, and project management. Dr Boonsinsukh and Dr Saengsirisuwan provided data collection. Dr Boonsinsukh provided data analysis. Dr Carlson-Kuhta and Dr Horak provided participants. Dr Horak provided fund procurement, facilities/equipment, and institutional liaisons. Dr Saengsirisuwan and Dr Horak provided consultation (including review of manuscript before submission). The authors thank Edward King and Martina Mancini for technical assistance. They appreciate the help from Dr Misha Pavel for use of the instrumented cane.
This study was approved by the Institutional Ethical Review Board of Oregon Health & Science University.
Funding support for this study was provided by National Institutes of Health grants F05AG032213 and R37AG006457.
- Received January 26, 2012.
- Accepted May 16, 2012.
