Chronic Obstructive Pulmonary Disease, COPD
Conditions
Keywords
1-minute Sit to Stand Test, chair seat height
Brief summary
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.
Detailed description
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.
Interventions
OTHER1-min STS test: adjusted
Individually adjusted chair seat height of 90° knee joint flexion
OTHER1-min STS test: standardized
Standardized chair seat height of 46 cm
Sponsors
University of Zurich
Thomas Riegler
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Number of repetitions in the 1-min STS test | 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
| Measure | Time frame | Description |
|---|---|---|
| Sit to stand power index | 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
| Measure | Time frame | Description |
|---|---|---|
| Ratings of perceived exertion | 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) |
| Ratings of perceived breathlessness | 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) |
| Oxygen saturation | During pulmonary rehabilitation, approximately 14 days | Difference in oxygen saturation profiles between the two experimental conditions |
| Questionnaire about the patient's preferences during the 1-min sit to stand test | 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. |
| Incorrectly performed repetitions during the 1-min STS test | During pulmonary rehabilitation, approximately 14 days | The number of incorrectly performed repetitions during th 1-min STS test |
| Heart rate | During pulmonary rehabilitation, approximately 14 days | Difference in heart rate profiles between the two experimental conditions |
Countries
Switzerland
Outcome results
None listed