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Nutrition, Exercise and Muscle Metabolism in Obesity

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT02397304
Recruitment Status : Unknown
Verified March 2015 by University of Birmingham.
Recruitment status was:  Not yet recruiting
First Posted : March 24, 2015
Last Update Posted : March 24, 2015
Sponsor:
Collaborator:
Allen Foundation Inc.
Information provided by (Responsible Party):
University of Birmingham

Study Description
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Brief Summary:
Obesity is a major public health issue and its association with insulin resistance greatly increases risks for cardiovascular disease and type 2 diabetes. Exercise training is recommended for obese populations, but longitudinal studies indicate aerobic exercise training in obese individuals in the absence of weight loss has minimal impact on insulin resistance. High turnover of fat stored within muscle cells (i.e., intramyocellular triglyceride) during exercise and elevated muscle fitness (i.e., muscle oxidative capacity) are key features of the enhanced insulin sensitivity observed in endurance-trained individuals. It could be that longitudinal studies of exercise training in obese individuals failed to sufficiently stimulate intramyocellular triglyceride turnover during exercise and muscle oxidative adaptation as a result of failure to consider the impact of recent nutrition within their study designs. Performing exercise in the fed vs. fasted state can blunt these exercise responses in non-obese individuals. The researchers will investigate the hypothesis that an acute bout of aerobic exercise performed in the overnight-fasted versus fed-state can stimulate greater intramyocellular triglyceride utilization during exercise and enhanced expression of genes related to muscle oxidative adaptation in obese individuals. The expected outcomes will help to determine if exercising in the fasted state could be used to optimise metabolic adaptation to training in obese individuals. The future impact of this research could be the recommendation of a simple nutritional strategy considering meal timing to enhance the effects of aerobic exercise training in obese individuals, with potential long-term benefits for reducing insulin resistance and cardio-metabolic disease risk.

Condition or disease Intervention/treatment Phase
Obesity Other: Exercise Not Applicable

Detailed Description:

Two thirds of the adult US population is overweight or obese and the prevention and treatment of obesity is a key priority due to the strain on societal health, well-being and economic prosperity. Obesity is associated with insulin resistance characterized by a reduced ability of insulin to stimulate glucose uptake into skeletal muscle and by hyperglycaemia. Obesity and insulin resistance are major risk factors for cardiovascular disease and type 2 diabetes. Weight loss through caloric restriction and increasing physical activity levels are the mainstay of non-surgical/pharmacological treatment for obesity. Weight loss can reduce insulin resistance although sustainable weight loss is difficult to achieve. Physical activity can help with weight maintenance but perhaps surprisingly, carefully controlled longitudinal studies in obese patients indicate aerobic exercise training in the absence of weight loss has no or at best modest impact on peripheral insulin resistance.

One mechanism by which regular aerobic exercise training ensures high peripheral insulin sensitivity in endurance trained individuals is via stimulation of intramyocellular triglyceride turnover and muscle fat oxidation, which maintains low muscle levels of fatty acid metabolites known to interfere with insulin-stimulated muscle glucose uptake (e.g., fatty acyl CoA, diacyglycerols, ceramides). Indirect evidence suggests intramyocellular triglyceride can be utilized as fuel during aerobic exercise in obese individuals, at least in the overnight-fasted state. However, the influence of overnight-fasted vs. fed-state exercise on intramyocellular triglyceride utilization and muscle oxidative adaptation has not been studied in obesity. This is important to study as fed-state exercise, as compared to overnight-fasted exercise, blunts exercise-associated increases in intramyocellular triglyceride utilization, oxidative gene expression, long-term adaptation of muscle oxidative capacity and resistance to high fat diet induced impairments in oral glucose tolerance in lean individuals.

Thus, the presence or timing of recent nutrition with respect to exercise could be a critical factor explaining the inability of aerobic exercise training per se to improve peripheral insulin sensitivity in longitudinal studies in obese populations. Exercising in the overnight-fasted state could optimize metabolic adaptation to training in obese individuals with long-term benefits for reduced insulin resistance and cardio-metabolic disease risk.

Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 8 participants
Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: Influence of Pre- or Post-exercise Food Intake on Muscle Metabolism in Obesity
Study Start Date : April 2015
Estimated Primary Completion Date : April 2016
Estimated Study Completion Date : April 2016
Arms and Interventions
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Arm Intervention/treatment
Experimental: Pre-exercise food
Pre-exercise food provision
 Other: Exercise
Participants will complete two morning exercise sessions. One will be performed in the overnight fasted-state (i.e. no food or drink, except water, from 10pm the evening before) and the other will be performed in the fed-state having received a breakfast by the research team before exercise.
Experimental: Post-exercise food
Post-exercise food provision
 Other: Exercise
Participants will complete two morning exercise sessions. One will be performed in the overnight fasted-state (i.e. no food or drink, except water, from 10pm the evening before) and the other will be performed in the fed-state having received a breakfast by the research team before exercise.


Outcome Measures
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Primary Outcome Measures :
  1. Intramuscular triglyceride use during exercise (arbitrary units) [ Time Frame: Up to 12 months ]
    Does exercising in the overnight-fasted state promote greater breakdown of intramuscular fat than performing exercise in the fed state?


Secondary Outcome Measures :
  1. Gene expression [ Time Frame: Up to 12 months ]
    The influence of pre- versus post-exercise feeding on the expression of genes related to exercise. training adaptation. Accordingly, muscle samples will be analysed using qPCr for expression of genes (relative mRNA) involved in fat metabolism (FAT/CD36, CPT1, βHAD), mitochondrial biogenesis (PGC-1α) and substrate oxidation (COXIV, CYT C, CS, SDH).


Eligibility Criteria
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Ages Eligible for Study:   18 Years to 49 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

  • Anthropometry/Body Size:

    i. Overweight (White European populations, BMI 25-29.9 kg/m2 or Asian populations, BMI 23-27.4 kg/m2) and have a high waist circumference (European, Sub-Saharan Africans and Eastern Mediterranean and middle east [Arab] men ≥ 94 cm [37 inches], women ≥ 80 cm [31.5 inches]; South Asian, Chinese, Japanese, and ethnic south and central Americans men ≥ 90 cm [35 inches], women ≥ 80 cm [31.5 inches]) or ii. Class I obesity (White European populations, BMI 30-34.9 kg/m2 or Asian populations, BMI 27.5-35 kg/m2).

  • Weight stable i.e. (±2 kg) for >3 months before enrolment
  • Sedentary i.e. no regular engagement in physical activity
  • Diagnosis and general health: Good general health defined as no known cardiovascular or metabolic disease
  • Compliance: understands and is willing, able and likely to comply with all study procedures and restrictions
  • Consent: demonstrates understanding of the study and willingness to participate as evidenced by voluntary written informed consent.

Exclusion Criteria:

  • Answering "YES" to any question on the Screening Form
  • Hypertension (≥140/90 mmHg)
  • Any ECG Abnormalities
  • Current participation in another clinical study
  • Current or recent smoker (last 30 days)
  • Past history of substance abuse, engagement in uncommon eating practices (e.g., sustained periods of fasting) and taking prescription or non-prescription medication (e.g., beta-blockers, insulin or thyroxine) or supplements that may influence normal metabolic responses.
  • Participants who have previously (within 5 years of the present study) had 4 or more muscle biopsies obtained from the thigh quadriceps region will be ineligible
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02397304


Contacts
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Contact: Gareth A Wallis, PhD 0121 414 4129 g.a.wallis@bham.ac.uk
Contact: Scott L Robinson, MSc 07935932024 slr247@bham.ac.uk

Sponsors and Collaborators
University of Birmingham
Allen Foundation Inc.
More Information
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Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

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Responsible Party: University of Birmingham
ClinicalTrials.gov Identifier: NCT02397304    
Other Study ID Numbers: RG_15-036
First Posted: March 24, 2015    Key Record Dates
Last Update Posted: March 24, 2015
Last Verified: March 2015
Keywords provided by University of Birmingham:
Intra-muscular triglyceride use
Additional relevant MeSH terms:
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Obesity
Overweight
Overnutrition
Nutrition Disorders
Body Weight