Effects of Exercise in People With Paraplegia

N/ACompletedNCT01203150

University of Miami32 enrolled

Overview

This hypothesis-driven study will investigate effects of physical activity with or without a nutrient supplement known to increase body lean mass in adults with chronic paraplegia who have clusters of obesity and obesity-related secondary complications.

Obesity and obesity-related secondary complications are pandemic health hazards that are highly prevalent among persons with spinal cord injuries (SCI). Accumulation of body fat disposes persons with SCI to accelerated endocrine and cardiovascular diseases, as well as pain, functional decline, and diminished health-related quality of life (HRQoL). While use of combined resistance and endurance exercise by persons without disability can remedy many of the problems associated with these disorders, their widespread use for persons with spinal cord injuries (SCI) must first satisfy scientific burdens of effectiveness. The investigators have adopted the term "obesity-related secondary complications" to describe accumulation of body fat clustering with other secondary CVD risks, while recognizing that a threshold criterion for diagnosis of obesity in persons with SCI remains ill-defined. For purposes of this proposal, the "-related" part of the term confers physical deconditioning, hypertension, fasting dyslipidemia, post-prandial lipemia (PPL), and impaired insulin sensitivity, all of which have been reported in persons with SCI. Contextualized, any of these risks occurring independently or in clusters would be cause for immediate therapeutic lifestyle intervention (TLI), if not frank medical treatment. Given our early understanding of effective treatments for these risks, any improvement in their severity would be CVD risk-reducing and thus life-benefiting and function-preserving. The investigators expect that the research findings will improve the understanding of risks for obesity and obesity-related secondary complications so that future interventions can be better targeted, identify an exercise intervention that can attend to current health risks, clarify whether nutrient supplementation improves risk-lessening benefits of exercise, identify exercise timing and intensities that best enhance fat utilization, and expand the understanding of the interrelated nature of risk factors after SCI.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

NONE

Enrollment

Conditions

Spinal Cord Injury

Interventions

ExerciseOTHER

CRT will occur 3 times per week for 26 weeks. Each training session will last approximately 40-45 minutes and employ resistance training (weight lifting) and high-speed, low intensity endurance activities (arm cranking) with interposed periods of incomplete recovery (i.e., heart rate not falling to baseline).

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: * SCI resulting in paraplegia between T5 and L1 * injury for more than one year * American Spinal Injury Association Impairment Scale (AIS) grade A-C injuries * BMI ≥ 23 kg/m2 (defined by studies as the equivalent to the WHO criterion of 25 kg/m2 as 'overweight', and the point at which health risks begin to increase), plus any two or more of the following conditions on screening: 1. prehypertension (BP ≥ 120/80 mmHg) by updated AHA and ADA criteria 2. dyslipidemia (HDL-C ≥ 40 mg/dL or TG ≤ 150 mg/dL) by NCEP ATP III Guidelines,44 or 3. impaired fasting glucose (≥ 100 mg/dL) by 2006 ADA criteria. Exclusion Criteria: * surgery within 6 months * pressure ulcer within 3 months * upper limb pain that limits exercise * recurrent acute infection or illness requiring hospitalization or IV antibiotics * pregnancy * previous myocardial infarction or cardiac surgery * 6 month history of glucose lowering and lipid-lowering drug therapy * Type I or II diabetes (by WHO criteria) * daily intake of vitamin supplements exceeding 100% RDA * The following medications and drug therapies will disqualify subjects from participating: beta-adrenergic antagonists, maintenance alpha-blockers, Methyldopa, thiazide and loop diuretics, parasympatholytic agents, zinc, estrogen/hormone replacement therapy excluding oral contraceptives, insulin-sensitizing drugs, and maintenance use of aspirin and nonsteroidal anti-inflammatory drugs.

Locations (1)

The Miami Project to Cure Paralysis

Miami, Florida, United States

Outcomes

Primary Outcomes

Global cardiovascular disease risk score

Global cardiovacular disease risk will be generated by evaluating blood metabolism in the fasting and fed state for inflammatory disease markers including total cholesterol: high density lipoprotein ratio (TC: HDL ratio), post-prandial lipemia (PPL), whole body fat oxidation (WBFO), insulin resistance, and inflammatory mediators.

Time frame: 4 visits over 9 months

Secondary Outcomes

Body composition

The percent of muscle and fat in each participants' body will be measured by dual x-ray absorptiometry (DEXA) scan.

Time frame: 4 visits over 9 months

Cardiovascular Endurance

Endurance will be measured using a calibrated upper arm ergometer. An initial exercise workload of 0 Watts at 60 revolutions per minute (RPM) for three minutes will be followed by three minute stages increasing in 20 Watt increments. Responses to exercise will be continuously monitored via open-circuit spirometry and 12-lead electrocardiography. Peak Work will be defined as volitional fatigue, inability to maintain targeted workload, or the point at which increasing workload fails to further increase VO2.

Time frame: 4 visits over 9 months

Muscular strength

Upper extremity dynamic strength testing will be performed on a Helms equalizer 1000 multi-station exerciser using the following maneuvers: overhead press, horizontal row, vertical butterfly, biceps curl, latissimus pull down (either to the chest or neck), and dips. The 1-repetition maximum (1-RM) will be calculated using the Mayhew regression equation.

Time frame: 8 visits over 9 months

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.