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Completed

NCT Number: NCT04579055

Impact of Chair Seat Height on the 1-Minute Sit to Stand Test Performance in Chronic Obstructive Pulmonary Disease

The 1-minute sit to stand (1-min STS) test is a standardized test which is used to examine exercise capacity in patients with chronic obstructive pulmonary disease (COPD). The chair seat height used is standardized to 46-48 cm. Using a standard seat height for all patients - irrespective of their body height - may lead to invalid estimates of functional exercise capacity. The objective of this study is to assess whether there is a difference in repetitions during the 1-min STS test if the seat height is adjusted to 90° knee joint angle or the standard height chair of 46 cm is used.

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Key information

Conditions

COPD Chronic Disease Chronic Obstructive Pulmonary Disease Disease Attributes Lung Diseases Lung Diseases, Obstructive Pathologic Processes Pathological Conditions, Signs and Symptoms Pulmonary Disease, Chronic Obstructive Respiratory Tract Diseases

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Berner Reha Zentrum

Heiligenschwendi, Canton of Bern, 3625, Switzerland

About this study

In a single-center, randomized crossover study, the investigators aim to elucidate whether there is a difference in repetitions during the 1-min STS test if the seat height is adjusted to 90° knee joint angle or the standard height chair of 46 cm is used.

Patients with COPD referred for pulmonary rehabilitation will be invited to perform one standardised- (chair seat height 46cm) and one individualized (chair seat height adapted to 90° knee flexion) 1-min STS test on two different days in random order.

The tests will be performed after patients are familiarised with the 1-min STS testing procedure and learning effects can be excluded.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patients with diagnosed COPD according to a forced expiratory volume in 1s (FEV1) / forced vital capacity (FVC) ratio below the lower limit of normal

Exclusion criteria

  • Patients who are not able to bend their knees while sitting on a standard chair (i.e., knee flexion less than 90°)
  • Patients who are not able to understand the instructions of the 1-min STS test, either of language or cognitive reasons
  • Patients who are unable to perform the STS test due to functional disability (i.e., being not able to rise from a chair without hand support), previous surgery, or pain according to the judgement of the responsible physician.
  • Patients who did not sign the informed consent form

Treatment and study plan

1-min STS test: adjusted

Other

Individually adjusted chair seat height of 90° knee joint flexion

1-min STS test: standardized

Other

Standardized chair seat height of 46 cm

Primary outcomes

  1. Number of repetitions in the 1-min STS test

    Time frame: During pulmonary rehabilitation, approximately 14 days

    difference in the amount of sit to stand repetitions in the 1-min STS test from a standard chair (46cm) or an individualized seat height chair of 90° knee joint angle

Secondary outcomes

  1. Sit to stand power index

    Time frame: During pulmonary rehabilitation, approximately 14 days

    The sit to stand power index is used to calculate the force-generating capacity (in watt) of the knee extensor muscles and is defined as: (leg length (in m) - seat height (in m)) x body mass x acceleration of gravity x sit to stand repetitions / time (sit-stand) (in sec.)

Other outcomes

  1. Oxygen saturation

    Time frame: During pulmonary rehabilitation, approximately 14 days

    Difference in oxygen saturation profiles between the two experimental conditions

  2. Heart rate

    Time frame: During pulmonary rehabilitation, approximately 14 days

    Difference in heart rate profiles between the two experimental conditions

  3. Ratings of perceived exertion

    Time frame: During pulmonary rehabilitation, approximately 14 days

    Difference in perceived exertion profiles between the two experimental conditions measured with the category ratio - 10 Borg scale (0-10)

  4. Ratings of perceived breathlessness

    Time frame: During pulmonary rehabilitation, approximately 14 days

    Difference in perceived breathlessness profiles between the two experimental conditions measured with the category ratio - 10 Borg scale (0-10)

  5. Incorrectly performed repetitions during the 1-min STS test

    Time frame: During pulmonary rehabilitation, approximately 14 days

    The number of incorrectly performed repetitions during th 1-min STS test

  6. Questionnaire about the patient's preferences during the 1-min sit to stand test

    Time frame: During pulmonary rehabilitation, approximately 14 days

    Multiple choice questions about patient reported perception concerning sitting position, chair height, perceived difficulties during the 1-min sit to stand test.

Sponsors and collaborators

Lead sponsor

Thomas Riegler

Other

Collaborators

  • University of Zurich

Registry information

Official study title

The Impact of Chair Seat Height on the 1-Minute Sit to Stand Test Performance in Chronic Obstructive Pulmonary Disease: a Randomized Cross-over Study

Important dates

Study start
2020
Primary completion
2021
Study completion
2021
First posted
Oct 8, 2020
Registry last updated
Jul 21, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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