Accurate Test of Limb Isometric Strength (ATLIS) in ALS

Study Overview
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Brief Summary
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A strength measurement device called Accurate Test of Limb Isometric Strength (ATLIS) was developed to precisely and conveniently measure static limb strength in patients with ALS. The investigator will compare ATLIS data with data from the commonly used ALS outcomes measure, the ALS Functional Rating Scale-Revised (ALSFRS-R), as well as an exploratory measure, electrical impedance myography (EIM), in a prospective, longitudinal study. Both outcomes measures will be performed on 100 subjects collected preferably at bi-monthly clinic visits during the study period.

Detailed Description
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Cedars-Sinai Medical Center will enroll and collect data on 100 subjects. Subjects will ideally be tested every 1 to 4 months according to each patient's site visit schedule. Subjects will be tested at each visit using ATLIS, the ALSFRS-R questionnaire and EIM.

Official Title
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Accurate Test of Limb Isometric Strength (ATLIS) in ALS

Conditions
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Amyotrophic Lateral Sclerosis

Participation Criteria
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Eligibility Criteria
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Inclusion criteria: Subjects 18 years or older diagnosed with clinically possible, laboratory supported probable, probable or clinically definite ALS according to the World Federation of Neurology Revised El Escorial Criteria. Capable of providing informed consent and complying with trial procedures. Active movement of at least two limbs at the time of study entry Intend to routinely attend clinic for neurological care at the clinical site Exclusion criteria: Patients, judged by the site clinical investigator to have medical conditions that may limit their ability to safely exert maximal force using the muscles in their arms and legs will be excluded from this study (e.g. unstable hypertension, significant cardiac disease, significant musculoskeletal disorders, or other medical conditions). Patients judged by the site clinical investigator to have significant clinical evidence of unstable medical or psychiatric illness will be excluded.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Accurate Test of Limb Isometric Strength (ATLIS) between each visit | ATLIS measures isometric strength in 12 muscle groups in the arms and legs. The subject is tested seated in a specially designed chairs with adjustable uprights. The subject's limb is placed in a standard position and maximal force is exerted on the wireless load cell fixed to the upright. Strength data is digitally captured and expressed as a percentage of expected normal. | every 1 to 4 months according to each patient's site visit schedule | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in ALS Functional Rating Scale - Revised (ALSFRS-R) between each visit | This questionnaire consists of 12 questions about the subject's ability to function in certain daily activities. Questions are asked in an interview format. | every 1 to 4 months according to each patient's site visit schedule | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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outcomes measures, strength measurement, disease progression