Interval Training, Inflammation and Immune Function

Study Overview
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Brief Summary
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PURPOSE: The purpose of this study is to investigate whether High Intensity Interval Training (HIIT)can improve the health and wellbeing of pre-diabetic elderly adults. In particular, there is specific interest in describing the effects of an interval exercise program on inflammatory state and immune function. DESIGN: Subjects will be sedentary, 65 to 80 years old adults, with prediabetes as defined by fasting plasma glucose (100 to 125 mg/dl). Before and after a 10-12 week High Intensity Interval Exercise training program subjects will undergo several tests including: 1) a maximal treadmill test, 2) an Oral Glucose Tolerance Test, 3) muscle biopsy, 4) body composition, 5) several physical function tests and 6) other health related measures including lung function, arterial stiffness and several blood measures (e.g. liver enzymes, kidney function). DATA ANALYSES & SAFETY ISSUES: As there are no comparison groups, data analyses will consist of performing paired t-tests on pre and post exercise training values for each of the measurement variables of interest. In addition, the data will be used to provide power calculations for future grant proposals. High Intensity Interval Training is a very safe exercise modality. The regular use of vigorous intensity exercise intervals have been used extensively in exercise training. In fact, the exercise intervals will start at levels lower and will be of shorter duration than were used during the maximal exercise test. They will then be carefully and slowly made to be more challenging as each subject is able to safely tolerate. HYPOTHESIS: The investigators hypothesize that HIIT will result in significant improvements in markers of inflammation, immune system markers and other health-related risk factors.

Official Title
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The Impact of High Intensity Interval Training on Inflammatory State and Immune Function in Elderly Individuals

Conditions
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Aging, Disease

Intervention / Treatment
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* Behavioral: High Intensity Interval training


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 65-80 years Prediabetic - Fasting plasma glucose is 100 - 125 on two separate days Able to walk for 2 minutes or more without stopping LDL Cholesterol ≤ 190; Triglycerides < 600; Blood Pressure ≤ 160/90 Inactive: Exercise < 2 days per week Medications: Stable use of all medications ≥ three months Exclusion Criteria: Smoker: tobacco use within the last 12 months Dieting or intending to diet; not weight stable ≥ six months (weight change < 5 pounds) Use of confounding inflammatory medications: aspirin, ibuprofen, naproxen (NSAIDS - nonsteriodal anti-inflammatory drugs) History of diabetes, heart disease or taking medications for those conditions History of hypertension (high blood pressure) not controlled with medication Unwillingness to undergo muscle biopsies and all other study testing, or to continuously participate in exercise training for 12 weeks. Inability to give blood continuously through a catheter (please notify the study nurse of any difficulties you have had in the past when having your blood drawn; the study nurse will determine whether you are excluded for this reason) Unwillingness to conduct ALL exercise sessions at the fitness facility during research study staff supervised times. Orthopedic limitations, musculoskeletal disease and/or injury Due to the nature of the study, persons with known joint, muscle or other orthopedic limitations that restrict physical activity may be excluded. Able to decide if you want to take part in the study Lack of transportation to the exercise and testing facilities

Ages Eligible for Study
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Minimum Age: 65 Years
Maximum Age: 80 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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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: HIIT Aging<br>all subjects will undergo high intensity interval training 3 x per week for 10-12 weeks. the intervals of high-intensity ( 85% of maximal capacity) will be 5 to 10 bouts of 30 seconds at this intensity with rest periods in between intervals that range from 30 seconds to 2 minutes | Behavioral: High Intensity Interval training<br>* all subjects will undergo high intensity interval training 3 x per week for 10-12 weeks. the intervals of high-intensity ( 85% of maximal capacity) will be 5 to 10 bouts of 30 seconds at this intensity with rest periods in between intervals that range from 30 seconds to 2 minutes<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in inflammatory markers in plasma |  | baseline and following exercise training, approximately 10-12 weeks | 
| Change in inflammatory markers in muscle |  | baseline and following exercise training, approximately 10-12 weeks | 
| Change in immune markers in peripheral blood |  | baseline and following exercise training, approximately 10-12 weeks | 
| Change in immune markers in muscle |  | baseline and following exercise training, approximately 10-12 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Metabolic Syndrome risk factors composite score | Classic and additional Metabolic Syndrome measures include: blood pressure, waist circumference, triglycerides, HDL, fasting glucose; plus liver and kidney function, insulin sensitivity, glucose tolerance, etc... | baseline and following exercise training, approximately 10-12 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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High Intensity Interval Training