Quantification of Distribution of the Mass Center for a Controlled Force Platform Reaction to the Ground

This study developed a controlled soil reaction force platform that provided controlled mechanical stimuli to quantify the distribution of the center of mass as a function of the angular variation of the ankle in the elderly in the upright position.

Study Overview

• Status: Completed
• Conditions: Balance
• Intervention / Treatment: Device: Force plate

Detailed Description

Usually the balance evaluation the center of mass displacement for the analysis of postural control is assessed by means of force platforms. However, most of these devices are stationary, that is the patient is the dynamic element which can generate an evaluation with high subjectivity index. Therefore, this study aimed at developed a reaction force to the ground platform which provides mechanical stimuli controlled to quantify the distribution of the mass center as a function of the angular variation in the elderly ankle in the upright position. The construction of the prototype was divided into 3 steps, based on the two-dimensional movement of the ankle joint. In the 1st stage the construction of the mechanical assembly; in the 2nd stage development of the electronics; and 3rd stage the development of the supervisory system (control system). The force plataform was evaluated following the engineering functional tests such as: characterization and calibration of the sensors, the definition of the transfer function and accuracy of tests of angular movements (+ 10 ° and -10 ° to the movements of inversion and eversion, + 15 and -15º to the movements of dorsiflexion and plantar flexion). For the tests with volunteers were selected 30 volunteers.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 85 years (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• We included in this study individuals male and female
• Age ranging from 20 to 85 years
• Asymptomatic individuals
• Must walk without the use of an attachment
• Do not present motor deficit that makes the study impossible

Exclusion Criteria:

• Decompensated congestive heart failure
• Neurological or neurological diseases that interfere with significant neuromotor
• Individuals who did not agree to participate in the study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: DIAGNOSTIC
• Allocation: NON_RANDOMIZED
• Interventional Model: PARALLEL
• Masking: NONE

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
EXPERIMENTAL: Group 1 (adult); Each volunteer stood on the platform. The duration of the tests was standardized at 10 seconds for each angulation variant of the test. The tilt variables occurred every 5 degrees oscillating in the two-dimensional movement of the ankle joint. The test was discontinued when the volunteer failed to remain balanced at the tested angulation for more than 10 seconds (thus shifting the foot (s) from the initial position or supporting with one and / or both arms at the therapist or at the support bars ) or when it reached maximum angulation	Device: Force plate; Device: force plate An equipment model with the approach of providing the evaluated person with the movement that is closest to the biomechanical and functional reality of the ankle and foot joint and which could equalize the possible changes of the center of mass would contribute to the clinical evaluation and would provide a more efficient therapeutic reasoning rehabilitation.
EXPERIMENTAL: Group 2 (elderly); Each volunteer stood on the platform. The duration of the tests was standardized at 10 seconds for each angulation variant of the test. The tilt variables occurred every 5 degrees oscillating in the two-dimensional movement of the ankle joint. The test was discontinued when the volunteer failed to remain balanced at the tested angulation for more than 10 seconds (thus shifting the foot (s) from the initial position or supporting with one and / or both arms at the therapist or at the support bars ) or when it reached maximum angulation	Device: Force plate; Device: force plate An equipment model with the approach of providing the evaluated person with the movement that is closest to the biomechanical and functional reality of the ankle and foot joint and which could equalize the possible changes of the center of mass would contribute to the clinical evaluation and would provide a more efficient therapeutic reasoning rehabilitation.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Mass distribution	The center of mass was measured by the patient remaining on the force platform, remaining for 10 seconds in each angulation variant Unit of measurement: Kilograms (kg)	15 minutes

Collaborators and Investigators

• Sponsor: Universidade Cruzeiro do Sul

Study record dates

Study Major Dates

• Study Start (ACTUAL): July 1, 2016
• Primary Completion (ACTUAL): July 20, 2016
• Study Completion (ACTUAL): July 30, 2016

Study Registration Dates

• First Submitted: May 3, 2018
• First Submitted That Met QC Criteria: May 3, 2018
• First Posted (ACTUAL): May 16, 2018

Study Record Updates

• Last Update Posted (ACTUAL): May 18, 2018
• Last Update Submitted That Met QC Criteria: May 15, 2018
• Last Verified: May 1, 2018

More Information

Terms related to this study

• Keywords: Center of mass; Force plate
• Other Study ID Numbers: 56483816.8.0000.5497

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No