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Acute Effects of Smartphone-Delivered Local Vibration on Hand Sensorimotor Performance
Sponsor: Acibadem University
Summary
This study investigates the acute effects of smartphone-delivered local vibration on hand sensorimotor performance in healthy young adults. Using a custom-developed iPhone application, three vibration frequencies (80 Hz, 150 Hz, and 220 Hz) are applied to the dominant hand in a randomized crossover design with a minimum 48-hour washout between sessions. The primary aim is to evaluate frequency-dependent dose-response effects on hand grip strength. Secondary aims include assessment of two-point discrimination (tactile spatial acuity), pressure pain threshold, and hand reaction time before and immediately after each vibration condition. The study seeks to generate evidence on optimal application parameters for smartphone vibration as an accessible and portable local vibration source in clinical and educational settings.
Official title: Acute Effects of Smartphone-Delivered Local Vibration at Three Frequencies on Hand Grip Strength, Two-Point Discrimination, Pressure Pain Threshold, and Reaction Time in Healthy Young Adults: A Randomized Crossover Study
Key Details
Gender
All
Age Range
18 Years - 25 Years
Study Type
INTERVENTIONAL
Enrollment
20
Start Date
2026-04
Completion Date
2026-11
Last Updated
2026-04-09
Healthy Volunteers
Yes
Interventions
Smartphone Local Vibration at 80 Hz
Local vibration delivered via a custom-developed iPhone application using the device haptic motor at 80 Hz. Participant seated with back support, shoulder neutral, elbow 90 degrees flexion, forearm neutral on table support, wrist relaxed. Phone held naturally in dominant hand palm. Five repetitions of 45 seconds vibration + 15 seconds rest. Participants instructed not to consciously squeeze during application.
Smartphone Local Vibration at 150 Hz
Local vibration delivered via a custom-developed iPhone application using the device haptic motor at 150 Hz. Same positioning and protocol as 80 Hz condition. Five repetitions of 45 seconds vibration + 15 seconds rest.
Smartphone Local Vibration at 220 Hz
Local vibration delivered via a custom-developed iPhone application using the device haptic motor at 220 Hz. Same positioning and protocol as 80 Hz condition. Five repetitions of 45 seconds vibration + 15 seconds rest.
Locations (1)
Acibadem Mehmet Ali Aydinlar University, Department of Physiotherapy and Rehabilitation
Istanbul, Turkey (Türkiye)