Effect of Whole Body Vibration in Young Females With Smartphone Addiction

December 14, 2025 updated by: Nesma Morgan Allam, Cairo University

Effect of Whole Body Vibration on Hand Grip Strength, Muscular Activity, and Upper Limb Function in Young Females With Smartphone Addiction: A Randomized Controlled Trial.

Young adults have a high prevalence of smartphone addiction. Many adolescents use their smartphones extensively for communication, which starts out as a habit but eventually turns into an addiction. Numerous studies have shown that adolescents use social media for roughly ten hours every day.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

66

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Egypt
    • Giza Governorate
      • Giza, Giza Governorate, Egypt, 1124
        • Faculty of Physical Therapy

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • High smartphone users according to the Smartphone Addiction Scale Short Version (SAS- SV)
  • Body mass index (BMI) less than 30 kg/m²
  • Didn't receive regular exercise in the last 6 months.

Exclusion Criteria:

  • Medical history of median nerve release, hand or thumb tendon lesion
  • Prior hand or wrist fractures
  • Medical history of hand injuries, and upper limb skin diseases
  • WBV contraindications include (joint issues, acute inflammations, back pain, epilepsy, diabetes, or neuromuscular disorders, or dizziness, any discomfort, and nausea)

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Group A (Whole body vibration group)
Whole body vibration (WBV) group will receive vibration on the platform for 20 repetitions in 2 sets with 2 minutes rest between sets in addition to strengthening exercises to the hand muscles.
Device: Whole body vibration
Participants will be asked to sit on an chair without armrests close to the platform and will be asked to perform 90° shoulder flexion, bend both elbows slightly, flex the trunk forwards and place both hands on the platform.
Other: Strengthening exercises
Participants will use elastic resistance for the finger extension and flexion exercises, and ball to strength wrist flexors for two sets of 10 repetitions within a training session.
Sham Comparator: Group B (Sham Whole body vibration group)
participants will receive WBV with the device turned off in addition to strengthening exercises to the hand muscles.
Other: Strengthening exercises
Participants will use elastic resistance for the finger extension and flexion exercises, and ball to strength wrist flexors for two sets of 10 repetitions within a training session.
Device: Sham Whole body vibration
Participants will receive the vibration with the device turned off.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Hand grip strength
Time Frame: 4 weeks
Participants will be asked to perform maximum hand grip with the dominant hand with hold for 5 seconds, for three repetitions using the hand held dynamometer (dynamometer, Jamar, United States), a 60 seconds rest interval will be planned in between the repetitions. The mean of the three repetitions will used for calculation of hand grip strength.
4 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
pinch strength
Time Frame: 4 weeks
The participant will be asked to sit comfortably, with the pinch gauge between the index and middle fingers, and thumb, with the tested arm at the side with the elbow flexed 90 degrees. After five seconds of holding the pinch with full force, take a reading, repeat three times.
4 weeks
Upper limb function
Time Frame: 4 weeks
The upper limb function will be assessed by using the Arms, Shoulders and Hands Disability Questionnaire (DASH) Quick, which is a validated and widely used 11-item questionnaire that evaluates certain impairments and symptoms in the upper limb. the score ranged from 0 to 100, the lower the score, the greater the results. While, higher scores represent the worst results.
4 weeks
Muscle activity of flexor carpi radialis muscle
Time Frame: 4 weeks
Muscle activity will be measured utilizing electromyography (EMG) using the Delsys Trigno (DST01) system for flexor carpi radialis muscle.
4 weeks
Muscle activity for flexor carpi ulnaris muscle
Time Frame: 4 weeks
Muscle activity will be measured utilizing electromyography (EMG) using the Delsys Trigno (DST01) system for flexor carpi ulnaris muscle.
4 weeks
Muscle activity for extensor digitorum communis muscle
Time Frame: 4 weeks
Muscle activity will be measured utilizing electromyography (EMG) using the Delsys Trigno (DST01) system for extensor digitorum communis muscle.
4 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Cairo University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 22, 2025

Primary Completion (Actual)

October 30, 2025

Study Completion (Actual)

November 30, 2025

Study Registration Dates

First Submitted

February 24, 2025

First Submitted That Met QC Criteria

February 24, 2025

First Posted (Actual)

February 27, 2025

Study Record Updates

Last Update Posted (Actual)

December 16, 2025

Last Update Submitted That Met QC Criteria

December 14, 2025

Last Verified

May 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • No. 7486

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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