title: Reduction in energy expenditure during walking using an automated stride assistance device in healthy young adults.
abstract: OBJECTIVE
  To investigate the effects of an automated stride assistance device that assists hip joint flexion and extension movement in energy expenditure during walking in healthy young adults using an expired gas method.
  
  
  METHODS
  Prospective, single-group design to compare the differences of energy expenditure between 2 assistive conditions.
  
  
  METHODS
  Laboratory.
  
  
  METHODS
  Healthy volunteers (N=10) aged 21 to 32 years.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Oxygen consumption per unit time (V˙o2) cost (ml·kg(-1)·m(-1)), and heart rate (beats/min) were measured in 2 assistive conditions (with 3-Nm hip motion assistance and without assistance) and at 2 walking speeds (comfortable walking speed [CWS] and maximum walking speed [MWS]).
  
  
  RESULTS
  There were no significant differences in walking speed between the with- and without-assistance conditions at either the CWS or MWS. The V˙o2 cost and heart rate were significantly reduced in the with-assistance condition compared with the without-assistance condition, at both the CWS and MWS. The reduction in the V˙o2 cost during the with-assistance condition, relative to the without-assistance condition, was 7.06% at the CWS and 10.52% at the MWS.
  
  
  CONCLUSIONS
  The automated stride assistance device is useful for reducing energy expenditure during walking in healthy adults. Further studies are warranted to investigate if this device provides substantial help to individuals with impaired mobility as a result of strength deficits.
authors: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science, Tokyo, Japan. Electronic address: kitatani.ryosuke.88x@st.kyoto-u.ac.jp.
authors: Ryosuke
authors: R
authors: Kitatani
authors: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors: Koji
authors: K
authors: Ohata
authors: Honda R&D Co, Ltd, Wako, Japan.
authors: Hideaki
authors: H
authors: Takahashi
authors: Kyoto University Hospital, Kyoto, Japan.
authors: Saori
authors: S
authors: Shibuta
authors: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science, Tokyo, Japan.
authors: Yu
authors: Y
authors: Hashiguchi
authors: Fujita Health University Hospital, Toyoake, Japan.
authors: Natsuki
authors: N
authors: Yamakami
mesh_terms: D000328:Adult; D051341:Dependent Ambulation / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D004864:Equipment and Supplies; D005080:Exercise Test; D005260:Female; D005684:Gait / Q000502:physiology*; D064368:Healthy Volunteers; D006339:Heart Rate / Q000502:physiology; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D016138:Walking / Q000502:physiology*; D055815:Young Adult
keywords: Rehabilitation; Robotics; Walking