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Novel Motor-Assisted Elliptical Training Intervention Improves 6-Minute Walk Test and Oxygen Cost for an Individual With Progressive Supranuclear Palsy

Irons, Sonya L. PT, DPT, CCS1; Brusola, Gregory A. PT, DPT2; Buster, Thad W. MS1; Burnfield, Judith M. PT, PhD1


In the article cited above, Table 1 on page 38 of the June 2015 issue of Cardiopulmonary Physical Therapy Journal included an error. The unit of measure for “Oxygen cost of SSC gait speed” in the last row of the table appeared incorrectly as mL • kg -1 • min -1 ; the correct unit of measure for this outcome is mL • kg -1 • m -1 . This error has been noted in the online version of the article, which is available at .

Cardiopulmonary Physical Therapy Journal. 27(2):55, April 2016.

Cardiopulmonary Physical Therapy Journal: June 2015 - Volume 26 - Issue 2 - p 36–41
doi: 10.1097/CPT.0000000000000007
Case Report

Introduction: This single-case study design describes the impact of training on a commercially available motor-assisted elliptical trainer on walking endurance and oxygen cost of self-selected comfortable (SSC) gait speed for an individual with progressive supranuclear palsy (PSP).

Case Presentation: A 67-year-old man with PSP and difficulties with ambulation, movement initiation, falls, and balance participated in a structured intervention on a motor-assisted elliptical trainer with body weight support (30 minutes, 3 d/wk, total of 24 sessions). The participant was systematically progressed across the training sessions by manipulating the motor-assisted elliptical training parameters (e.g., speed, step length, motor assistance, and body weight support). Walking endurance and oxygen cost of SSC gait speed were measured pretraining, posttraining, and at 1-month follow-up.

Conclusions: The participant's 6-minute walk test (6MWT) distance and oxygen cost improved after training. One month of detraining revealed sharp declines in the 6MWT distance and worsening of his Freezing of Gait questionnaire score. However, improved oxygen cost was sustained at 1-month follow-up. This case study is the first to document outcomes from a motor-assisted elliptical training program for an individual with PSP. Improved walking distance and oxygen cost suggest possible benefits of structured exercise for an individual with PSP.

1Movement and Neurosciences Center, Institute for Rehabilitation Science and Engineering, Madonna Rehabilitation Hospital, Lincoln, NE

2School of Physical Therapy, Texas Woman's University Institute of Health Sciences, Houston Center, Houston, TX

Correspondence: Sonya L. Irons, PT, DPT, CCS, Movement and Neurosciences Center, Institute for Rehabilitation Science and Engineering, Madonna Rehabilitation Hospital, 5401 South Street, Lincoln, NE 68506 (

The contents of this research were developed, in part, under a grant (H133G070209) from the Department of Education, National Institute on Disability and Rehabilitation Research. However, the contents do not necessarily represent the policy of the Department of Education, and endorsement by the federal government should not be assumed. Support was also provided by funding from The Donald and Pearl Winkler Institute Endowment.

Three patents (2 US and 1 Canadian) have been issued to J. M. Burnfield and T. W. Buster for the ICARE technology. The patented technology has been licensed to SportsArt for commercial distribution and any sales could lead to a royalty distribution. The remaining authors declare no conflicts of interest.

© 2015 Cardiovascular and Pulmonary Section, APTA
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