Comparison of energy efficiency between Wearable Power-Assist Locomotor (WPAL) and two types of knee-ankle-foot orthoses with a medial single hip joint (MSH-KAFO)

Kanan Yatsuya, Satoshi Hirano, Eiichi Saito, Shigeo Tanabe, Hirotaka Tanaka, Masayuki Eguchi, Masaki Katoh, Yasuhiro Shimizu, Akito Uno, Hitoshi Kagaya

Research output: Contribution to journalArticle

Abstract

Objective: To compare the energy efficiency of Wearable Power-Assist Locomotor (WPAL) with conventional knee-ankle-foot orthoses (MSH-KAFO) such as Hip and Ankle Linked Orthosis (HALO) or Primewalk. Study design: Cross over case-series. Setting: Chubu Rosai Hospital, Aichi, Japan, which is affiliated with the Japan Organization of Occupational Health and Safety. Methods: Six patients were trained with MSH-KAFO (either HALO or Primewalk) and WPAL. They underwent 6-minute walk tests with each orthosis. Energy efficiency was estimated using physiological cost index (PCI) as well as heart rate (HR) and modified Borg score. Trial energy efficiency with MSH-KAFO was compared with WPAL to assess if differences in PCI became greater between MSH-KAFO and WPAL as time goes on during the 6-minute walk. Spearman correlation coefficient of time (range: 0.5–6.0 minutes) with the difference was calculated. The same statistical procedures were repeated for HR and modified Borg score. Results: Greater energy efficiency, representing a lower gait demand, was observed in trials with WPAL compared with MSH-KAFO (Spearman correlation coefficients for PCI, HR and modified Borg were 0.93, 0.90 and 0.97, respectively, all P < 0.0001). Conclusions: WPAL is a practical and energy efficient type of robotics that may be used by patients with paraplegia.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalJournal of Spinal Cord Medicine
Volume41
Issue number1
DOIs
Publication statusPublished - 02-01-2018

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Foot Orthoses
Melanocyte-Stimulating Hormones
Hip Joint
Ankle
Knee
Orthotic Devices
Heart Rate
Occupational Health
Costs and Cost Analysis
Cross-Over Studies
Hip
Japan
Paraplegia
Robotics
Gait
Organizations

All Science Journal Classification (ASJC) codes

  • Clinical Neurology

Cite this

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title = "Comparison of energy efficiency between Wearable Power-Assist Locomotor (WPAL) and two types of knee-ankle-foot orthoses with a medial single hip joint (MSH-KAFO)",
abstract = "Objective: To compare the energy efficiency of Wearable Power-Assist Locomotor (WPAL) with conventional knee-ankle-foot orthoses (MSH-KAFO) such as Hip and Ankle Linked Orthosis (HALO) or Primewalk. Study design: Cross over case-series. Setting: Chubu Rosai Hospital, Aichi, Japan, which is affiliated with the Japan Organization of Occupational Health and Safety. Methods: Six patients were trained with MSH-KAFO (either HALO or Primewalk) and WPAL. They underwent 6-minute walk tests with each orthosis. Energy efficiency was estimated using physiological cost index (PCI) as well as heart rate (HR) and modified Borg score. Trial energy efficiency with MSH-KAFO was compared with WPAL to assess if differences in PCI became greater between MSH-KAFO and WPAL as time goes on during the 6-minute walk. Spearman correlation coefficient of time (range: 0.5–6.0 minutes) with the difference was calculated. The same statistical procedures were repeated for HR and modified Borg score. Results: Greater energy efficiency, representing a lower gait demand, was observed in trials with WPAL compared with MSH-KAFO (Spearman correlation coefficients for PCI, HR and modified Borg were 0.93, 0.90 and 0.97, respectively, all P < 0.0001). Conclusions: WPAL is a practical and energy efficient type of robotics that may be used by patients with paraplegia.",
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Comparison of energy efficiency between Wearable Power-Assist Locomotor (WPAL) and two types of knee-ankle-foot orthoses with a medial single hip joint (MSH-KAFO). / Yatsuya, Kanan; Hirano, Satoshi; Saito, Eiichi; Tanabe, Shigeo; Tanaka, Hirotaka; Eguchi, Masayuki; Katoh, Masaki; Shimizu, Yasuhiro; Uno, Akito; Kagaya, Hitoshi.

In: Journal of Spinal Cord Medicine, Vol. 41, No. 1, 02.01.2018, p. 48-54.

Research output: Contribution to journalArticle

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T1 - Comparison of energy efficiency between Wearable Power-Assist Locomotor (WPAL) and two types of knee-ankle-foot orthoses with a medial single hip joint (MSH-KAFO)

AU - Yatsuya, Kanan

AU - Hirano, Satoshi

AU - Saito, Eiichi

AU - Tanabe, Shigeo

AU - Tanaka, Hirotaka

AU - Eguchi, Masayuki

AU - Katoh, Masaki

AU - Shimizu, Yasuhiro

AU - Uno, Akito

AU - Kagaya, Hitoshi

PY - 2018/1/2

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N2 - Objective: To compare the energy efficiency of Wearable Power-Assist Locomotor (WPAL) with conventional knee-ankle-foot orthoses (MSH-KAFO) such as Hip and Ankle Linked Orthosis (HALO) or Primewalk. Study design: Cross over case-series. Setting: Chubu Rosai Hospital, Aichi, Japan, which is affiliated with the Japan Organization of Occupational Health and Safety. Methods: Six patients were trained with MSH-KAFO (either HALO or Primewalk) and WPAL. They underwent 6-minute walk tests with each orthosis. Energy efficiency was estimated using physiological cost index (PCI) as well as heart rate (HR) and modified Borg score. Trial energy efficiency with MSH-KAFO was compared with WPAL to assess if differences in PCI became greater between MSH-KAFO and WPAL as time goes on during the 6-minute walk. Spearman correlation coefficient of time (range: 0.5–6.0 minutes) with the difference was calculated. The same statistical procedures were repeated for HR and modified Borg score. Results: Greater energy efficiency, representing a lower gait demand, was observed in trials with WPAL compared with MSH-KAFO (Spearman correlation coefficients for PCI, HR and modified Borg were 0.93, 0.90 and 0.97, respectively, all P < 0.0001). Conclusions: WPAL is a practical and energy efficient type of robotics that may be used by patients with paraplegia.

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