Magnetic Resonance & Optical Spectroscopy Validation

Study Overview
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Brief Summary
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The purpose of this study is to develop and refine techniques for using magnetic resonance and optical spectroscopy to investigate how your body uses energy.

Detailed Description
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Primary Study Objective: To evaluate the reproducibility of acquiring multi-nuclear data on a new 3T Philips Magnet in conjunction with Optical Spectroscopy.

Official Title
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Development and Validation of 31P Magnetic Resonance and Optical Spectroscopy for the Characterization of ATP in Whole Body Human Applications

Conditions
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Validation Studies, Magnetic Resonance Spectroscopy

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female Age 18 - 89 Healthy (self assessed) Weight under 350lbs Able to walk 50 yards without stopping Able to travel to hospital for study visits Able to follow a 3-step command Able to remain in magnetic resonance (MR) scanner for up to 2 hours Exclusion Criteria: Have internal metal medical devices, including cardiac pacemakers, aortic or cerebral aneurysm clips, artificial heart valves, ferromagnetic implants, shrapnel, wire sutures, joint replacements, bone or joint pins/rods/screws, metal fragments in your eye, or non-removable jewelry such as rings. Are unwilling or unable to complete the imaging procedures for the duration of the magnetic resonance imaging (MRI) scan due to claustrophobia or other reason. Serious mental illness that might preclude subject's ability to comply with study treatment Are pregnant or plan on becoming pregnant in the next 8 weeks. History of deep vein thrombosis (DVT) or pulmonary embolism (PE) Varicose Veins Known genetic factor (Factor V Leiden, etc.) or hypercoagulable state, including cancer, leukemia - such as chronic myelocytic leukemia (CML), hemoglobinopathies - such as sickle-cell disease and multiple myeloma and other proteinopathies. Diagnosed peripheral arterial or vascular disease Family history of primary DVT or PE Peripheral neuropathy History of chronic venous stasis or lower extremity edema Female taking hormonal birth control (oral or otherwise) AND smoker

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 89 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Healthy Adult<br>This is a protocol development study, with no interventions or treatments. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Rate of phosphocreatine (PCr) decay | The PCr decay (rate of PCr breakdown during ischemia) will be used to measure the ATP turnover rates (ATPase). After the baseline is established, the volunteer will be asked to perform contractions of the quadriceps (by slight kicking) for up to 45 seconds. . After kicking is stopped, the volunteer will remain still for an additional 5 minutes in order to allow the PCr peak to return to baseline. The ATPase experiment will also be performed by acquiring 31P Spectra every 6 seconds. | Hour 2 | 
| Rate of oxygen uptake | OS will be used to measure the oxygen (O2) uptake by following the rate of Hb-O2 and Mb-O2 deoxygenation during ischemia. The rate of the depletion of these O2 stores measures the rate of O2 uptake by the mitochondria. The Horbia Jobin Yvon optical system will be used. The OS acquisition procedure has been thoroughly described by Marcinek et.al | Hour 2 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Adenosine Triphosphate, Validation, Magnetic Resonance Spectroscopy, Optical Spectroscopy