title: Physiological Responses During the Lower Body Positive Pressure Supported Treadmill Test.
abstract: OBJECTIVE
  To quantify changes in cardiopulmonary function using a lower body positive pressure supported (LBPPS) treadmill during the exercise tolerance test (ETT) in healthy subjects before applying the LBPPS treadmill in patients with gait problems.
  
  
  METHODS
  We evaluated 30 healthy subjects who were able to walk independently. The ETT was performed using the Modified Bruce Protocol (stages 1-5) at four levels (0%, 40%, 60%, and 80%) of LBPPS. The time interval at each level of the LBPPS treadmill test was 20 minutes to recover to baseline status. We measured systolic blood pressure, diastolic blood pressure, peak heart rate (PHR), rating of perceived exertion (RPE), metabolic equivalents (METs), and oxygen consumption rate (VO2) during each LBPPS condition.
  
  
  RESULTS
  Systolic blood pressure increased as the LBPPS level was increased (40% to 80%). PHR, RPE, METs, and VO2were negatively associated with the LBPPS condition, although they were not always significant different among the LBPPS levels. The equation from a random effect linear regression model was as follows: VO2(mL/kg/min)=(2.75×stage)+(-0.14×LBPPS level)+11.9 (r2=0.69).
  
  
  CONCLUSIONS
  Detection of the changes in physiological parameters during a submaximal ETT using the LBPPS system may be helpful for applying the LBPPS treadmill in patients who cannot perform the ETT due to gait problems, even at submaximal intensity.
authors.affiliation: Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Center, Chonnam National University Hospital, Gwangju, Korea.; Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: Ka-Young
authors.identifier: 0000-0002-5521-5565
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Center, Chonnam National University Hospital, Gwangju, Korea.; Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: Jae-Young
authors.identifier: 0000-0003-1672-8875
authors.initials: JY
authors.lastname: Han
authors.affiliation: Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Center, Chonnam National University Hospital, Gwangju, Korea.; Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: Ji-Hyun
authors.identifier: 0000-0003-4892-6753
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Center, Chonnam National University Hospital, Gwangju, Korea.; Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: Dong-Ju
authors.identifier: 0000-0003-3695-3332
authors.initials: DJ
authors.lastname: Kim
authors.affiliation: Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Center, Chonnam National University Hospital, Gwangju, Korea.; Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: In-Sung
authors.identifier: 0000-0003-3967-9201
authors.initials: IS
authors.lastname: Choi
keywords: Exercise test; Gait; Metabolic equivalent; Oxygen consumption; Rehabilitation