Vitamin D and Muscle Metabolic Function

David Travis Thomas

Status: Completed

Conditions: Healthy

Treatments: Other: aerobic training; Dietary Supplement: vitamin D

Study type: Interventional

Funder types: Other

Identifiers

NCT02221596

1R21AG046762-01A1

Details and patient eligibility

About

The purpose of this study is to identify the magnitude of muscle lipid redistribution and muscle oxygen use in individuals 60 years old or older following combined treatment of vitamin D repletion and aerobic training compared to vitamin D repletion alone, aerobic training alone, or no treatment.

Full description

The investigators plan to recruit approximately 56 aged individuals with vitamin D insufficiency for a 13 week trial. All subjects will be 60 years of age or older. Participants will be randomized to one of four groups: vitamin D (50,000IU/wk) + aerobic training (7 days during the 13th week); vitamin D (50,000IU/wk) + normal daily activity during the 13th week; placebo + aerobic training (7 days during the 13th week); or placebo + normal daily activity during the 13th week.

Following screening and informed consent process a physical activity questionnaire will be administered. A blood draw will then be conducted at baseline, midpoint and endpoint. Collected blood for the purposes of this study will assess vitamin D status (25(OH)D), parathyroid hormone, ionized calcium, insulin, and a comprehensive metabolic panel. At baseline and endpoint muscle lipid will be assessed using Magnetic Resonance Spectroscopy and muscle oxygen consumption will be determined using a novel hybrid diffuse optical instrument consisting of a near-infrared spectroscopy and a diffuse correlation spectroscopy. In addition, at each study time point 3 dietary recalls will be completed and physical activity will be measured using an accelerometer.

Enrollment: 50 patients

Sex: All

Ages: 60+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Age: 60 and older
• BMI: 18.5-29
• Communicates fluently in English

Exclusion criteria

• Metal implant not suitable for MRI
• Any form of hormone replacement therapy
• Engage in more than 1 hr/week of vigorous activity
• Participated in a high-intensity resistance or aerobic training program in the last 3 months
• Lower extremity injury or surgery in the past 3 months
• Foot sores or bone conditions severely limiting ability to move or perform exercise or joint pain made worse by mild exercise
• Diabetes, inflammatory bowel disease, renal disease or uncontrolled hypertension.
• Currently have or had a history of cardiovascular or pulmonary disease that would preclude the involvement in the performance of exercise
• History of myopathy (including congenital myopathies)
• History of neurological conditions related to spinal derangement, disk disease, peripheral neuropathies, tremor and rigidity
• Past medical history of hyperparathyroidism, kidney stones or rhabdomyolysis
• Currently receiving treatment for vitamin D deficiency
• Vitamin D level >30ng/mL
• Currently smoking

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Factorial Assignment

Masking: Quadruple Blind

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50 participants in 4 patient groups

vitamin D + aerobic training

Experimental group

Description:

vitamin D capsules every weekday (10,000IU/day) and exercise

Treatment:

Dietary Supplement: vitamin D

Other: aerobic training

vitamin D + no aerobic training

Active Comparator group

Description:

vitamin D capsules every weekday (10,000IU/day) and no exercise

Treatment:

Dietary Supplement: vitamin D

placebo + aerobic training

Active Comparator group

Description:

placebo capsule every weekday and exercise

Treatment:

Other: aerobic training

placebo + no aerobic training

No Intervention group

Description:

placebo capsule every weekday and no exercise