Investigation of Vision on Knee Joint Velocity Sense in Healthy Adults

February 20, 2026 updated by: Anthi Kellari, University of Thessaly

The Effect of Vision on Proprioceptive Perception of Angular Velocity at the Knee Joint.

The study included two tasks to test how well people could reproduce the speed of knee movement at two different speeds (20°/s and 120°/s) under two vision conditions: eyes closed and eyes open. It included 10 participants.

The equipment used was a Biodex 4 Pro dynamometer, an eye mask, and a goniometer. Participants wore shorts so that the knee area was free for the measurements.

Before starting, each participant's height, weight, age, and sex were recorded. All measurements were done while sitting. The order of the tests was random. Each participant chose the first four letters of the alphabet at random, and each letter matched a combination of speed and vision condition (A: eyes closed, B: eyes open, C: 120°/s, D: 20°/s). For the eyes-closed condition, participants wore the eye mask. The tests were conducted in a quiet room to help participants focus.

First, the knee was moved passively by the machine so participants could feel the speed. Then, they tried to reproduce the same speed themselves. The 20°/s tests had 5 repetitions, and the 120°/s tests had 8 repetitions. The whole session lasted about 20 minutes.

Participants tried to stay focused, and at the end of each condition, they rated their attention using a simple 10-point scale.

Study Overview

Status

Completed

Conditions

Study Type

Observational

Enrollment (Actual)

60

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

  • Greece
    • Fthiotis
      • Lamia, Fthiotis, Greece, 35132
        • Physiotherapy Department, University of Thessaly

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

Yes

Sampling Method

Non-Probability Sample

Study Population

60 healthy adults participated in the study. Participants were aged 18-25 years, included both males and females (30 male - 30 female), and had no history of knee injuries. All measurements were performed in a controlled laboratory environment.

Description

Inclusion Criteria:

young, healthy adults

Exclusion Criteria:

knee pain or knee disorder, or knee surgery, neurological diseases, heart diseases, respiratory diseases

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Αbsolute error of target velocity under the two conditions
Time Frame: single session ( 20 minutes)
Participants' ability to reproduce the speed of knee movement at two velocities (20°/s and 120°/s) under eyes open and eyes closed conditions, measured with a Biodex 4 Pro dynamometer.
single session ( 20 minutes)

Collaborators and Investigators

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

Sponsor

University of Thessaly

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 15, 2025

Primary Completion (Actual)

June 13, 2025

Study Completion (Actual)

June 20, 2025

Study Registration Dates

First Submitted

February 20, 2026

First Submitted That Met QC Criteria

February 20, 2026

First Posted (Actual)

February 27, 2026

Study Record Updates

Last Update Posted (Actual)

February 27, 2026

Last Update Submitted That Met QC Criteria

February 20, 2026

Last Verified

February 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 13866/25/ΤΦΣΚΘ

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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