Visual Feedback Monitoring During Exercise in Individuals With Obesity

Study Overview
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Brief Summary
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Exercise has been shown to offer numerous health benefits and be particularly important in preventing weight gain or regain for people with obesity. Exercise guidelines can be difficult to interpret and apply independently and do not address specific exercise limitations in individuals with obesity. The exercise monitoring system proposed in this study might provide a new method to meet aerobic exercise guidelines independently with reduced risk of injury. The exercise monitoring system controls, in real-time, the intensity of an exercise session consisting of treadmill walking. During treadmill walking, the exercise monitoring system will instruct participants to increase or decrease how much participants raise their knees and swing their arms while maintaining a smooth contact with the ground, based on real-time readings of the participants' heart rate. In this clinical trial, each participant will perform a control and an experimental training session. Both training sessions will include four blocks of 7 minutes of treadmill walking alternated with three periods of rest (3 min). In the control session, participants will monitor the intensity of exercise independently using a standard heart rate monitor and control it by adjusting their walking speed. In the experimental session, each participant will follow the exercise monitoring system instructions displayed on a TV, and treadmill walking speed will be set at a comfortable walking speed. Target heart rates of 40% and 60% HRR will be used as the exercise intensities in both training sessions. The investigators will examine energy expenditure, heart rate, and kinematic measures under control and experimental conditions. The goals of this clinical trial are to determine the effect of exercising with the exercise monitoring system in individuals with obesity. The investigators hypothesized that the experimental session will result in higher total energy cost and efficiency than the control session; and in lower heart rate error, tibial positive peak accelerations and feedback errors than the control session. The investigators will also compare the effect of the exercise monitoring system between active and sedentary individuals with obesity. The results of this study will inform proposals for larger interventions that will focus on 1) testing different types of obesity and osteoarthritis, 2) adding a resistance-training component, and 3) integrating a diet intervention.

Official Title
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Visual Feedback Monitoring During Exercise in Individuals With Obesity

Conditions
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Obesity

Intervention / Treatment
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* Device: Visual feedback monitoring system
* Device: Control


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: BMI ≥ 30.0 kg/m2 and ≤ 40.0 kg/m2 Age 20 to 45 years; Able to understand spoken English at the level needed to: understand and follow instructions for equipment setup, testing, and task performance answer questions related to effort and preference be able to understand consent document and provide informed assent Exclusion Criteria: Any signs or symptoms suggestive of cardiovascular, pulmonary, metabolic, or renal disease. Any injury or health condition that affects the ability to walk on a treadmill.

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 45 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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Design Details

Primary Purpose: Prevention
Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Active-Sedentary Control<br> | Device: Control<br>* Participants will monitor the intensity of exercise independently using a standard heart rate monitor and control it by adjusting the treadmill speed (walking speed).<br>|
| Experimental: Active-Sedentary Experimental<br> | Device: Visual feedback monitoring system<br>* Participants will follow the exercise monitoring system's instructions displayed on a TV. Treadmill walking speed will be set at a comfortable walking speed.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Energy expenditure | Energy expenditure (J) resulting from the exercise session | Up to 4 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Heart rate | Average and Maximum heart rate (bpm) resulting from the exercise session | Up to 4 weeks | 
| Tibial positive peak acceleration | Tibial positive peak accelerations (g) resulting from the exercise session | Up to 4 weeks | 
| Maximum hip flexion | Maximum hip flexion angles (degrees) resulting from the exercise session. | Up to 4 weeks |