Individual Variability in Response to Exercise in Adults
Study Details
Study Description
Brief Summary
In this proposal, the investigators challenge the assumption that following the physical activity guidelines implies benefit for ALL adults, and that if benefit is not achieved in response to first line therapy, it will be by simply exercising more. Thus, for improving cardiorespiratory fitness and cardiometabolic risk factors, unanswered questions include: 1) To what extent, regardless of increasing exercise intensity, is exercise not associated with benefit? Demonstration of a resistance to benefit through exercise in a substantial number of adults would be a novel and important finding, would counter the assumptions of many if not most health care practitioners, and could have immediate and direct application in all health care settings. 2) To what extent will non-responders to first line therapy (150 min/wk) be required to increase exercise intensity to achieve benefit? 3) To what extent will failure to improve CRF segregate (be associate with) with cardiometabolic risk factors? The investigators propose that adults who remain exercise resistant for improvement in CRF and cardiometabolic risk despite increasing amount or intensity are at high risk of metabolic disease and consequently, are candidates for alternative treatment strategies.
Condition or Disease | Intervention/Treatment | Phase |
---|---|---|
|
N/A |
Detailed Description
The trial has two objectives:
Primary objective: After 16 weeks of first line therapy (150 min/wk of MPA), does increasing exercise intensity for 16 weeks improve cardiorespiratory fitness (CRF, VO2peak) deferentially depending on the CRF response at 16 weeks.
Secondary objective: Determine whether common cardiometabolic risk factors segregate/cluster with respect to variation in CRF to first line therapy in adults, and, whether clinically meaningful improvements in cardiometabolic risk factors segregate with improvement in CRF.
Study Design
Arms and Interventions
Arm | Intervention/Treatment |
---|---|
Experimental: Low amount, low intensity exercise exercise dose (amount and intensity) will be controlled. |
Behavioral: Low amount, low intensity exercise
Participants will exercise under supervision. Exercise dose will vary by amount and intensity
|
Experimental: Low amount, high intensity exercise exercise dose (amount and intensity) will be controlled. |
Behavioral: Low amount, high intensity exercise
Participants will exercise under supervision. Exercise dose will vary by amount and intensity
|
No Intervention: Control
|
Outcome Measures
Primary Outcome Measures
- Cardiorespiratory Fitness [Measured at baseline and every 4 weeks for 32 weeks.]
Cardiorespiratory fitness will be determined using direct (open circuit spirometry) measures of oxygen consumption (expressed in L/min) obtained during a maximal treadmill test.
Secondary Outcome Measures
- Change in cardiometabolic risk factors [Measured at baseline, 16 and 32 weeks.]
Fasting glucose (mmol/L)
- Change in cardiometabolic risk factors [Measured at baseline, 16 and 32 weeks.]]
Fasting LDL- and HDL-cholesterol (mmol/L)
- Change in cardiometabolic risk factors [Measured at baseline, 16 and 32 weeks.]]
fasting insulin (pmol/L)
- Change in cardiometabolic risk factor [Measured at baseline, 16 and 32 weeks.]
fasting triglycerides (mmol/L)
- Change in body composition [Measured at baseline, 16 and 32 weeks]
Total adiposity
- Change in body composition [Measured at baseline, 16 and 32 weeks.]
Visceral adiposity
- Change in body composition [Measured at baseline 16 and 32 weeks.]
Lean mass
- Change in body composition [Measured at baseline, 16 and 32 weeks.]
Subcutaneous adiposity
- Change in obesity phenotype [Measured at baseline 16 and 32 weeks.]
waist circumference
- Change on body weight [Measured at baseline, 16 and 32 weeks.]
Body weight
Eligibility Criteria
Criteria
Inclusion Criteria:
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Sedentary lifestyle (planned physical activity for one day per week or less).
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Weight stable (± 2 kg) for 6 months prior to the beginning of the study.
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BMI between 20 and 40 kg/m2.
Exclusion Criteria:
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Physical impairment which would make the intervention very difficult or unsafe according to doctor's advice.
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Diabetes, current smokers.
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Plan to move from the area in next 8 months.
Contacts and Locations
Locations
No locations specified.Sponsors and Collaborators
- Queen's University
Investigators
None specified.Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- Ross2022