Methods matter- construct validity of steps per day in patients with lumbar spinal stenosis
(2025) In European Spine Journal- Abstract
Purpose: This study aimed to evaluate the ability of a thigh-worn accelerometer to detect walking during daily life in individuals with Lumbar Spinal Stenosis (LSS). Two hypotheses were made regarding how walking measurements from the accelerometer, a walking test, and an ankle-worn StepWatch would relate in order for the accelerometer to be valid. The hypotheses were: (a) there is no difference between the longest walk recorded by the accelerometer during daily life and the maximum walking duration in a walking test, and (b) the accelerometer agrees with the StepWatch in measuring total daily steps. Methods: This cross-sectional observational study on construct validity included 83 individuals with LSS who had a thigh-worn... (More)
Purpose: This study aimed to evaluate the ability of a thigh-worn accelerometer to detect walking during daily life in individuals with Lumbar Spinal Stenosis (LSS). Two hypotheses were made regarding how walking measurements from the accelerometer, a walking test, and an ankle-worn StepWatch would relate in order for the accelerometer to be valid. The hypotheses were: (a) there is no difference between the longest walk recorded by the accelerometer during daily life and the maximum walking duration in a walking test, and (b) the accelerometer agrees with the StepWatch in measuring total daily steps. Methods: This cross-sectional observational study on construct validity included 83 individuals with LSS who had a thigh-worn accelerometer for seven days and completed a walking test. Twenty-one also had an ankle-worn StepWatch simultaneously. Results: The duration of the longest walk recorded by the thigh-worn accelerometer and the walking test significantly agreed within an equivalence margin of 34%. The thigh-worn accelerometer recorded fewer steps per day than the ankle-worn StepWatch, Bland-Altman 95% limits of agreement at −162% to 35%, mean difference − 64%. Post hoc analysis showed agreement on step count during continuous walking, Bland-Altman limits of agreement at −7.1% to 1.8%, mean difference − 2.6%. Conclusion: The results suggest that a thigh-worn accelerometer can monitor continuous walking in daily life in individuals with LSS. The thigh-worn accelerometer did not agree with the ankle-worn StepWatch on daily steps. Device type and wear-site should be considered when interpreting step data.
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- author
- Gustafsson, Malin Eleonora av Kák LU ; Schiøttz-Christensen, Berit ; Wedderkopp, Niels ; O’Neill, Søren Francis Dyhrberg and Brønd, Jan Christian
- organization
- publishing date
- 2025
- type
- Contribution to journal
- publication status
- epub
- subject
- keywords
- Accelerometer, Lumbar spinal stenosis, Monitoring, Neurogenic claudication, Validity, Walking, Walking test
- in
- European Spine Journal
- publisher
- Springer Science and Business Media B.V.
- external identifiers
-
- pmid:41006653
- scopus:105017404329
- ISSN
- 0940-6719
- DOI
- 10.1007/s00586-025-09404-9
- language
- English
- LU publication?
- yes
- id
- abee7540-c99e-4e1c-a4ca-1182fb4bbab0
- date added to LUP
- 2025-12-08 11:30:06
- date last changed
- 2025-12-09 03:00:13
@article{abee7540-c99e-4e1c-a4ca-1182fb4bbab0,
abstract = {{<p>Purpose: This study aimed to evaluate the ability of a thigh-worn accelerometer to detect walking during daily life in individuals with Lumbar Spinal Stenosis (LSS). Two hypotheses were made regarding how walking measurements from the accelerometer, a walking test, and an ankle-worn StepWatch would relate in order for the accelerometer to be valid. The hypotheses were: (a) there is no difference between the longest walk recorded by the accelerometer during daily life and the maximum walking duration in a walking test, and (b) the accelerometer agrees with the StepWatch in measuring total daily steps. Methods: This cross-sectional observational study on construct validity included 83 individuals with LSS who had a thigh-worn accelerometer for seven days and completed a walking test. Twenty-one also had an ankle-worn StepWatch simultaneously. Results: The duration of the longest walk recorded by the thigh-worn accelerometer and the walking test significantly agreed within an equivalence margin of 34%. The thigh-worn accelerometer recorded fewer steps per day than the ankle-worn StepWatch, Bland-Altman 95% limits of agreement at −162% to 35%, mean difference − 64%. Post hoc analysis showed agreement on step count during continuous walking, Bland-Altman limits of agreement at −7.1% to 1.8%, mean difference − 2.6%. Conclusion: The results suggest that a thigh-worn accelerometer can monitor continuous walking in daily life in individuals with LSS. The thigh-worn accelerometer did not agree with the ankle-worn StepWatch on daily steps. Device type and wear-site should be considered when interpreting step data.</p>}},
author = {{Gustafsson, Malin Eleonora av Kák and Schiøttz-Christensen, Berit and Wedderkopp, Niels and O’Neill, Søren Francis Dyhrberg and Brønd, Jan Christian}},
issn = {{0940-6719}},
keywords = {{Accelerometer; Lumbar spinal stenosis; Monitoring; Neurogenic claudication; Validity; Walking; Walking test}},
language = {{eng}},
publisher = {{Springer Science and Business Media B.V.}},
series = {{European Spine Journal}},
title = {{Methods matter- construct validity of steps per day in patients with lumbar spinal stenosis}},
url = {{http://dx.doi.org/10.1007/s00586-025-09404-9}},
doi = {{10.1007/s00586-025-09404-9}},
year = {{2025}},
}