An interventional study of Instagram Browsing and YouTube Video Viewing in Gait Analysis in Healthy Subjects, Balance Control and Smartphones, sponsored by Poznan University of Physical Education. Completed at 1 site in Poland. Open to participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-05.
Sponsored by Poznan University of Physical Education · Not applicable, Interventional, and Basic science
This study evaluated the effects of smartphone use on gait biomechanics and standing postural control in healthy adults. Participants performed standardized smartphone tasks under different experimental conditions while walking on a treadmill and while maintaining a standing position. Gait parameters and postural control measures were assessed to determine whether the type of smartphone task and the manner of using the device influence human movement and balance. The study aimed to identify task-specific changes associated with smartphone use during walking and standing.
This randomized experimental study investigated the effects of smartphone use on gait biomechanics and static postural control in healthy adults. The study consisted of two complementary experimental assessments: treadmill gait analysis and standing posturography.
During the gait assessment, participants walked on a treadmill at a standardized speed while performing predefined smartphone tasks. Spatiotemporal gait parameters were recorded and compared between experimental conditions.
During the postural control assessment, participants performed smartphone-related tasks while standing. Postural stability was assessed using posturographic measures derived from center-of-pressure displacement. Experimental conditions differed according to the type of smartphone task and the manner in which the device was held or used.
The study was designed to determine whether smartphone-related cognitive and motor demands produce task-specific changes in gait and postural control. The two experimental components were analyzed separately because they represent different aspects of motor performance: dynamic locomotion and static postural stability.
Poznan University of Physical Education is the lead sponsor of 90 studies on the registry; 27 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
Participants completed both assessments without smartphone use or any additional task.
Participants completed the baseline assessment without smartphone use and, during the second assessment, browsed short videos on Instagram using their own smartphone.
Behavioral: Instagram Browsing
Participants completed the baseline assessment without smartphone use and, during the second assessment, repeatedly typed a standardized text message on their own smartphone.
Behavioral: Text Messaging
Participants completed the baseline assessment without smartphone use and, during the second assessment, watched a standardized one-minute video on YouTube while holding the smartphone with both hands in landscape orientation.
Behavioral: YouTube Video Viewing
Participants browsed short-form video content on Instagram using their own smartphone during the experimental assessment. The smartphone was held naturally, usually in portrait orientation in one hand.
Participants watched the same standardized one-minute educational video on YouTube during the experimental assessment while holding their smartphone with both hands in landscape orientation at a comfortable height.
Participants repeatedly typed a standardized Polish text message on their own smartphone during the experimental assessment. The smartphone was held naturally, usually in one hand.
Change in Cadence
Change in gait cadence between the baseline assessment and the second assessment, measured using the Zebris FDM-T instrumented treadmill.
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Total Double Support Time
Change in total double support time between the baseline assessment and the second assessment, measured using the Zebris FDM-T instrumented treadmill.
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Left Step Length
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Right Step Length
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Step Width
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Left Foot Rotation
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Right Foot Rotation
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Lower-Limb Load Asymmetry Index
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Path Length
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Mean Sway
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Mean Velocity
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Sway Area
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Change in Maximum Sway
Time frame: Baseline and approximately 2 minutes after completion of the baseline assessment, during the same study visit
Plan to share: Yes — De-identified individual participant data underlying the reported results are available in public research data repositories. Data from the treadmill gait assessment and standing posturography assessment are shared separately together with the corresponding study datasets.
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is completed, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
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Poznan University of Physical Education