Well at least you know this is the Hawthorne effect, but why you didn't put that in the title is beyond me.
Effect of investigator observation on gait parameters in individuals with stroke
Journal of Biomechanics , Volume 100(109602)
NARIC Accession Number: J84189. What's this?
ISSN: 0021-9290.
Author(s): Ardestani, Marzieh M. ; Hornby, T. George.
Project Number: H133B031127.
Publication Year: 2020.
Number of Pages: 7.
Abstract: Study investigated whether testing conditions, specifically the presence of an observer, influences patient behaviors and clinical and biomechanical measures of walking function. This potential effect of observational awareness, also known as the Hawthorne effect, on spatiotemporal and biomechanical measures of locomotor function in individuals post-stroke has not been assessed previously. Fifteen ambulatory individuals with chronic stroke wore instrumented insoles and performed two separate normal-pace walking assessments, including unobserved conditions during which participants were unattended and unaware of data collection, and observed conditions with an investigator present. Gait analysis was conducted outside of a laboratory setting using instrumented insoles equipped with a three-dimensional accelerometer and pressure sensors which captured the spatiotemporal kinematics, vertical ground reaction forces and foot acceleration. Data were compared using paired comparisons, with subsequent correlation and stepwise regression analyses to explore potential associations between Hawthorne-induced changes in walking strategies, gait speed and locomotor performance (daily stepping). Except for cadence, other measures of spatiotemporal parameters and swing kinematics (acceleration) were not significantly different between observed vs unobserved conditions. However, analyses of ground reaction forces revealed significantly greater paretic limb loading and increases in weight bearing symmetry during observed versus unobserved conditions. This potential Hawthorne effect was greater in those with slower walking speeds and shorter stride lengths but was not related to daily stepping. The present findings suggest that biomechanical parameters of walking function may be related to the presence of an observer and highlight the need to separately measure locomotor capacity (gait speed) and performance (daily stepping).
Descriptor Terms: AMBULATION, BIOENGINEERING, EVALUATION TECHNIQUES, MEASUREMENTS, MOTOR SKILLS, OUTCOMES, STROKE.
Can this document be ordered through NARIC's document delivery service*?: Y.
Citation: Ardestani, Marzieh M. , Hornby, T. George. (2020). Effect of investigator observation on gait parameters in individuals with stroke. Journal of Biomechanics , 100(109602) Retrieved 8/18/2020, from REHABDATA database.
NARIC Accession Number: J84189. What's this?
ISSN: 0021-9290.
Author(s): Ardestani, Marzieh M. ; Hornby, T. George.
Project Number: H133B031127.
Publication Year: 2020.
Number of Pages: 7.
Abstract: Study investigated whether testing conditions, specifically the presence of an observer, influences patient behaviors and clinical and biomechanical measures of walking function. This potential effect of observational awareness, also known as the Hawthorne effect, on spatiotemporal and biomechanical measures of locomotor function in individuals post-stroke has not been assessed previously. Fifteen ambulatory individuals with chronic stroke wore instrumented insoles and performed two separate normal-pace walking assessments, including unobserved conditions during which participants were unattended and unaware of data collection, and observed conditions with an investigator present. Gait analysis was conducted outside of a laboratory setting using instrumented insoles equipped with a three-dimensional accelerometer and pressure sensors which captured the spatiotemporal kinematics, vertical ground reaction forces and foot acceleration. Data were compared using paired comparisons, with subsequent correlation and stepwise regression analyses to explore potential associations between Hawthorne-induced changes in walking strategies, gait speed and locomotor performance (daily stepping). Except for cadence, other measures of spatiotemporal parameters and swing kinematics (acceleration) were not significantly different between observed vs unobserved conditions. However, analyses of ground reaction forces revealed significantly greater paretic limb loading and increases in weight bearing symmetry during observed versus unobserved conditions. This potential Hawthorne effect was greater in those with slower walking speeds and shorter stride lengths but was not related to daily stepping. The present findings suggest that biomechanical parameters of walking function may be related to the presence of an observer and highlight the need to separately measure locomotor capacity (gait speed) and performance (daily stepping).
Descriptor Terms: AMBULATION, BIOENGINEERING, EVALUATION TECHNIQUES, MEASUREMENTS, MOTOR SKILLS, OUTCOMES, STROKE.
Can this document be ordered through NARIC's document delivery service*?: Y.
Citation: Ardestani, Marzieh M. , Hornby, T. George. (2020). Effect of investigator observation on gait parameters in individuals with stroke. Journal of Biomechanics , 100(109602) Retrieved 8/18/2020, from REHABDATA database.
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