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Pre-diabetesISAICNCT01286922

The Insulin Sensitivity Using Aerobic Interval Conditioning

A study testing Behavioral: exercise in people with Pre-diabetes, run by Pennington Biomedical Research Center at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The Insulin Sensitivity using Aerobic Interval Conditioning (ISAIC) trial will compare traditional aerobic training (AER) to interval training (INT) in sedentary, overweight/obese men at risk for pre-diabetes. Read more about this study

Who is it for?
Ages 30 to 60 years, men onlyHealthy volunteers can take part
Conditions the study is for
Pre-diabetes
What is being tested?
Behavioral: exercise
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
42 participants
Where
1 siteUnited States
Study dates
Jul 2009to Feb 2012
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 30 to 60 years
  • Men only
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Age 30 to 60 years, inclusive
  • BMI greater than or equal to 25 - less than or equal to 35 kg/m2
  • Waist circumference >38"; Waist-to-Hip Ratio >0.95 Sedentary Lifestvle
  • Not physically active greater than or equal to 3 days/week-l for 20 min each time for the previous 6 months,
  • Not participating in regular resistance exercise

Who cannot join

  • Resting blood pressure greater than or equal to 160/100 mm Hg
  • Triglycerides greater than or equal to 500 mg/dL
  • Factors that may limit adherence to intervention or affect conduct of the trial such as lack of time, amount of travel, and/or work or family stressors
  • Unable or willing to communicate with staff, to provide written informed consent, or accept the randomized assignment
  • Failure to complete behavioral run-in and baseline testing
  • Hospitalization for depression in the last 6 months
Show all 28Show fewer
  • Not physically capable of performing the exercise required of the study protocols
  • Consuming >14 alcoholic beverages per week
  • Plans to be away >4 weeks in the next 6 months
  • Lack of support from primary health care provider or family members
  • Signficant weight loss in the past year (>20 kg) or current use of weight loss medications
  • Current diagnsis of schizophrenia, or other psychotic disorders, or bipolar disorder
  • Another member of household is a participant or staff member of the study.
  • History of bariatric surgery within last 3 years,
  • Other temporary intervening event, such as sick spouse, bereavement, or recent move.
  • Other medical, psychiatric, or behavioral limitations that in the view of the principal investigator may interfere with study participation or the ability to follow the intervention protocol.
  • Underlying diseases or conditions likely to limit lifespan and/or affect the safety of the intervention
  • Cancers requiring treatment in the past 5 years, unless prognosis is excellent.
  • Self-report HIV or tuberculosis.
  • History or evidence of serious arrhythmias, cardiomyopathy, congestive heart failure, aortic aneurysm, or heart transplantation.
  • Renal disease: currently receiving dialysis.
  • Type I diabetes mellitus
  • Type 2 diabetes mellitus, defined as:
  • Fasting plasma glucose levels greater than or equal to 26 mg/dL 2-hour postprandial Oral Glucose Tolerance Test results greater than or equal to 200 mg/dL
  • Any other medical condition or disease that is life threatening or that can interfere with or be aggravated by exercise.
  • Chronic obstructive lung disease, peripheral vascular disease or angina that limits ability to follow exercise protocol.
  • Advanced neuropathy or retinopathy.
  • Smoker or have used nicotine/tobacco products within the last 12 months.

Trial locations and contacts

1 site in 1 country.

United States1 site
  • Pennington Biomedical Research Center

    Baton Rouge, Louisiana, 70808

Other trials in United States

About this study

The Insulin Sensitivity using Aerobic Interval Conditioning (ISAIC) trial will compare traditional aerobic training (AER) to interval training (INT) in sedentary, overweight/obese men at risk for pre-diabetes. The investigators will randomly assign 42 individuals to 3 months of monitored exercise using a randomly assisgned design where participants will exercise under either AER or INT training conditions. The AER training condition will be consistent with "standard-of-care" recommendations. Exercise training will entail one 3-month blocks of either AER or INT. Training will consist of 1) a 1-month ramp up period, 2) 1-month of traditional aerobic training and 3) 1-month of either continued AER or INT.

Read the detailed description

It is currently estimated that type II diabetes (T2D) affects 5-8% of adults. Also recognized is a transitional group of individuals whose control of blood glucose is abnormal, but not yet considered diabetic. These individuals are classified as having pre-diabetes, which is defined as having impaired fasting glucose (IFG;fasting glucose 100-125 mg/dl), impaired glucose tolerance (IGT; post 2-h glucose load; 140-199 mg/dl) or both. This population represents a significant segment of the population as it is estimated that approximately 23% of Americans have pre-diabetes (IGT or IFG). Two unifying features associated with these metabolic impairments is a strong link to obesity and physical inactivity. Regular exercise positively influences IFG/IGT and obesity, and represents an important therapy for preventing the progression to T2D by enhancing several mechanisms of action including improved: glucose metabolism, muscle respiratory capacity, mitochondrial respiratory chain activity and ß-oxidation. Importantly, the dose of physical activity required to promote metabolic benefits appears to be obtainable for most individuals with as little as ~1000 kcal/w of aerobic activity.

While most exercise policy statement guidelines recommend that exercise be performed within an intensity ranging of 40-85% V02max, newer guidelines, such as the recently updated Physical Activity and Public Health Recommendations recognize that few studies have examined the effects of intensity, duration, or frequency of physical activity independent of their contribution to the total amount of physical activity. Accordingly, this writing group specifically recommended that, "based on recent data, there is some indication that vigorous-intensity activities may have greater benefit for reducing cardiovascular disease and premature mortality than moderate-intensity physical activity .... that much more work is needed is this area."

Conditions
Pre-diabetes
Being tested
Behavioral: exercise
Keywords
diabetes, exercise, insulin resistance, interval training, physical activity
Medical subject headings
Glucose Intolerance, Diabetes Mellitus, Motor Activity, Insulin Resistance

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Behavioral: exerciseOther

    Specific Aim: We will identify, recruit, assess, and randomly assign 42 sedentary, overweight-obese individuals who are at risk for pre-diabetes to an AER or INT training group in order to test the hypothesis:

    • Individuals randomized to INT will have greater improvements in insulin sensitivity than individuals assigned to traditional AER.

    Secondary Aim: We will measure maximal cardiorespiratory fitness (VO2max/peak) in order to test the hypothesis:

    • Individuals randomized to the INT group will have a greater improvement in VO2max/peak than individuals in traditional AER group.
Study groups in NCT01286922
Study groupRoleWhat they receive
Interval TrainingExperimentalThe target intensity for the INT group is 2 min at about 95% of baseline VO2max followed by 2 min of recovery at 40-50% of VO2max. Regardless of the training method each participant will be "locked" into a weekly energy expenditure of 12 kilocalories per kilogram of body weight per week (KKW).
Receives: Other: Behavioral: exercise
Aerobic ConditioningPlacebo comparatorDuring the first AER training condition, we will train all participants at an energy expenditure of 12 kcal/kg/wk (KKW). The target exercise intensity for the AER group will be 50%-70% of baseline V02max.
Receives: Other: Behavioral: exercise

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Insulin Sensitivity

    Individulas randomized to INT will have greater improvements in insulin sensitivity than individuals assigned to traditional AER.

    Measured: 3 months

Secondary outcomes (1)
  1. Cardiorespiratory Fitness

    Individuals randomized to the INT group will have a greater improvement in VO2max/peak than individuals in traditional AER group.

    Measured: 3 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted31 Jan 2011 (estimated)
  2. Study startJul 2009
  3. Primary completionFeb 2012
  4. Study completionFeb 2012

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Investigator, Outcomes assessor
Enrolment
42 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01286922
Sponsor's protocol ID
PBRC 29018
Other IDs
R56DK081807
Acronym
ISAIC
Status last verified
Sep 2022
First submitted
28 Jan 2011
Last updated
15 Sep 2022
Results posted
No
Data monitoring committee
Yes

Publications

  • Harris MI, Flegal KM, Cowie CC, Eberhardt MS, Goldstein DE, Little RR, Wiedmeyer HM, Byrd-Holt DD. Prevalence of diabetes, impaired fasting glucose, and impaired glucose tolerance in U.S. adults. The Third National Health and Nutrition Examination Survey, 1988-1994. Diabetes Care. 1998 Apr;21(4):518-24. doi: 10.2337/diacare.21.4.518.

    PubMed 9571335
  • Expert Committee on the Diagnosis and Classification of Diabetes Mellitus. Report of the expert committee on the diagnosis and classification of diabetes mellitus. Diabetes Care. 2003 Jan;26 Suppl 1:S5-20. doi: 10.2337/diacare.26.2007.s5. No abstract available.

    PubMed 12502614
  • American Diabetes Association. Diagnosis and classification of diabetes mellitus. Diabetes Care. 2007 Jan;30 Suppl 1:S42-7. doi: 10.2337/dc07-S042. No abstract available.

    PubMed 17192378
  • Benjamin SM, Valdez R, Geiss LS, Rolka DB, Narayan KM. Estimated number of adults with prediabetes in the US in 2000: opportunities for prevention. Diabetes Care. 2003 Mar;26(3):645-9. doi: 10.2337/diacare.26.3.645.

    PubMed 12610015
  • Zierath JR, Tsao TS, Stenbit AE, Ryder JW, Galuska D, Charron MJ. Restoration of hypoxia-stimulated glucose uptake in GLUT4-deficient muscles by muscle-specific GLUT4 transgenic complementation. J Biol Chem. 1998 Aug 14;273(33):20910-5. doi: 10.1074/jbc.273.33.20910.

    PubMed 9694838
  • Lund S, Holman GD, Schmitz O, Pedersen O. Contraction stimulates translocation of glucose transporter GLUT4 in skeletal muscle through a mechanism distinct from that of insulin. Proc Natl Acad Sci U S A. 1995 Jun 20;92(13):5817-21. doi: 10.1073/pnas.92.13.5817.

    PubMed 7597034
  • Hayashi T, Wojtaszewski JF, Goodyear LJ. Exercise regulation of glucose transport in skeletal muscle. Am J Physiol. 1997 Dec;273(6):E1039-51. doi: 10.1152/ajpendo.1997.273.6.E1039.

    PubMed 9435517
  • Turcotte LP, Richter EA, Kiens B. Increased plasma FFA uptake and oxidation during prolonged exercise in trained vs. untrained humans. Am J Physiol. 1992 Jun;262(6 Pt 1):E791-9. doi: 10.1152/ajpendo.1992.262.6.E791.

    PubMed 1319676
  • Kiens B, Essen-Gustavsson B, Christensen NJ, Saltin B. Skeletal muscle substrate utilization during submaximal exercise in man: effect of endurance training. J Physiol. 1993 Sep;469:459-78. doi: 10.1113/jphysiol.1993.sp019823.

    PubMed 8271208
  • Gregg EW, Gerzoff RB, Caspersen CJ, Williamson DF, Narayan KM. Relationship of walking to mortality among US adults with diabetes. Arch Intern Med. 2003 Jun 23;163(12):1440-7. doi: 10.1001/archinte.163.12.1440.

    PubMed 12824093
  • Fletcher GF, Blair SN, Blumenthal J, Caspersen C, Chaitman B, Epstein S, Falls H, Froelicher ES, Froelicher VF, Pina IL. Statement on exercise. Benefits and recommendations for physical activity programs for all Americans. A statement for health professionals by the Committee on Exercise and Cardiac Rehabilitation of the Council on Clinical Cardiology, American Heart association. Circulation. 1992 Jul;86(1):340-4. doi: 10.1161/01.cir.86.1.340. No abstract available.

    PubMed 1617788
  • Physical activity and cardiovascular health. NIH Consensus Development Panel on Physical Activity and Cardiovascular Health. JAMA. 1996 Jul 17;276(3):241-6.

    PubMed 8667571
  • American College of Sports Medicine Position Stand. The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults. Med Sci Sports Exerc. 1998 Jun;30(6):975-91. doi: 10.1097/00005768-199806000-00032.

    PubMed 9624661
  • Albright A, Franz M, Hornsby G, Kriska A, Marrero D, Ullrich I, Verity LS. American College of Sports Medicine position stand. Exercise and type 2 diabetes. Med Sci Sports Exerc. 2000 Jul;32(7):1345-60. doi: 10.1097/00005768-200007000-00024.

    PubMed 10912903
  • Haskell WL, Lee IM, Pate RR, Powell KE, Blair SN, Franklin BA, Macera CA, Heath GW, Thompson PD, Bauman A. Physical activity and public health: updated recommendation for adults from the American College of Sports Medicine and the American Heart Association. Med Sci Sports Exerc. 2007 Aug;39(8):1423-34. doi: 10.1249/mss.0b013e3180616b27.

    PubMed 17762377

Questions about this trial

What is this clinical trial studying?

A study testing Behavioral: exercise in people with Pre-diabetes, run by Pennington Biomedical Research Center at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 28 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 15 Sep 2022. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Insulin Sensitivity (time frame: 3 months). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT01286922, which also lists 16 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Sep 2022.

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