Smartphone Use and Hand Function in Young Adults

NCT07540546 | Not Yet Recruiting

• 1 other identifier: Smartphone&Proprioception1
• Study Type: observational
• Target: 84
• Locations: 1 country
• Sites: 1

Brief Summary

This observational cross-sectional study aims to investigate the relationship between daily smartphone usage duration and hand function parameters in young adults. Specifically, the study will examine the association between smartphone screen time and dominant hand grip strength, thumb strength, and wrist and thumb proprioception. Healthy individuals aged 18-35 years will be included. All participants will undergo a single-session assessment including measurement of smartphone usage duration, hand grip strength, pinch strength, and joint position sense of the wrist and thumb. The findings are expected to provide insight into the potential effects of prolonged smartphone use on hand function and proprioceptive performance in young adults.

Conditions

Smartphone Addiction

Outcome Measures

Primary Outcomes (4)

• Hand Grip Strength

  Hand grip strength will be measured using a hydraulic hand dynamometer. The participant will be in a seated position with the elbow flexed at 90 degrees. Three measurements will be taken with a 10-second rest between each, and the average value will be recorded in kilograms (kg).

  Single assessment at baseline

• Thumb Pinch Strength

  Thumb muscle strength will be measured using a pinchmeter. The participant will be seated with the elbow flexed at 90 degrees and the wrist in a neutral position. The average of three trials will be recorded in kilograms (kg).

  Single assessment at baseline

• Thumb Active Joint Position Sense (JPS)

  Measured using a standard transparent plastic goniometer. The researcher will passively move the thumb to a 30-degree abduction target position. The participant will be asked to actively reproduce this angle. The absolute error between the target angle and the reproduced angle will be recorded in degrees.

  Single assessment at baseline

• Wrist Joint Position Sense (JPS)

  Measured using a goniometer with the participant's eyes closed. The wrist will be passively moved to predetermined positions (30 degrees flexion, 30 degrees extension, 10 degrees radial deviation, and 15 degrees ulnar deviation). The participant will then actively reposition the wrist, and the absolute error will be calculated in degrees.

  Single assessment at baseline

Secondary Outcomes (2)

• Smartphone Screen Time

  Single assessment at baseline

• Smartphone Addiction Scale-Short Form

  Single assessment at baseline

Study Arms (2)

Observational Group: Smartphone-Addicted Participants

Participants classified as having smartphone addiction according to the Smartphone Addiction Scale-Short Form will undergo a single-session assessment including daily smartphone screen time, dominant hand grip strength, thumb pinch strength, wrist joint position sense, and thumb joint position sense.

Other: Assessment Protocol

Observational Group: Non-Addicted Participants

Participants classified as not having smartphone addiction according to the Smartphone Addiction Scale-Short Form will undergo the same single-session assessment including daily smartphone screen time, dominant hand grip strength, thumb pinch strength, wrist joint position sense, and thumb joint position sense.

Other: Assessment Protocol

Interventions

Assessment Protocol OTHER

All participants will undergo a standardized assessment protocol including measurement of smartphone addiction level, daily smartphone screen time from the past 7 days, dominant hand grip strength, thumb pinch strength, wrist proprioception, and thumb proprioception in a single session

Observational Group: Non-Addicted Participants; Observational Group: Smartphone-Addicted Participants

Eligibility Criteria

• Age: 18 Years - 35 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Healthy Universitty Student

You may qualify if:

• Healthy adults
• Aged between 18 and 35 years
• Voluntary participation in the study

You may not qualify if:

• History of hand or wrist surgery
• Fracture or serious injury in the hand/thumb within the last 6 months
• Neurological disorders
• Rheumatologic diseases
• Cognitive impairment preventing understanding of instructions

Sponsors & Collaborators

• Saglik Bilimleri Universitesi: lead

Study Sites (1)

Saglik Bilimleri Universitesi

Istanbul, Uskudar, 34668, Turkey (Türkiye)

Location

MeSH Terms

Conditions

Internet Addiction Disorder

Interventions

Nursing Assessment

Condition Hierarchy (Ancestors)

Technology Addiction; Behavior, Addictive; Compulsive Behavior; Impulsive Behavior; Behavior

Intervention Hierarchy (Ancestors)

Nursing Process; Comprehensive Health Care; Patient Care Management; Health Services Administration

Central Study Contacts

Esra Pehlivan

CONTACT

+90 0216 777 8 777; esra.pehlivan@sbu.edu.tr

Sümeyra Köseoğlu

CONTACT

+90 0216 777 8 777; sumeyrakoseoglu655@gmail.com

Study Design

• Study Type: observational
• Observational Model: CASE CONTROL
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal İnvestigator

Study Record Dates

• First Submitted: April 13, 2026
• First Posted: April 20, 2026
• Study Start: May 1, 2026
• Primary Completion (Estimated): May 1, 2027
• Study Completion (Estimated): May 1, 2027
• Last Updated: April 22, 2026

Record last verified: 2026-04

Locations

TU (1)