None listed
Conditions
Brief summary
Being overweight causes increased risk for type 2 diabetes. We have shown that participation in regular interval sprinting reduces diabetic risk in young adult females. However, no examination of older women appears to have been carried out. Thus, we hypothesize that 8 weeks of interval sprinting will significantly reduce insulin resistance in middle-aged women, Twenty overweight women will be assigned to a 8 week interval sprinting exercise group and 20 to a control group. All women will be screened for entry to the study. Exercise will involve 3 x 20 minute sessions of interval sprinting for 8 weeks. Fitness (sub max test), body composition (DEXA), metabolic status (GTT, insulin), autonomic state (heart rate variability, baroreceptor sensitivity), cardiovascular (blood pressure, arterial stiffness, muscle blood flow, cardiac output, stroke volume), and blood markers (insulin, natriuretic peptides, cytokines) will be assessed before and after the 8 week intervention.
Interventions
Forty overweight women will be randomly assigned to an exercise or control group. Exercise will consist of 8 weeks of interval sprinting with three 20 minute sessions per week. Each 20 minute bout of interval sprinting will consist of 60 mini-sprints of 8 seconds followed by 12 seconds of easy pedaling. Exercise will be performed on a stationary bike and all sessions will be supervised by an exercise physiologist. All women must complete 24 exercise sessions and must make up a session if one
Forty overweight women will be randomly assigned to an exercise or control group. Exercise will consist of 8 weeks of interval sprinting with three 20 minute sessions per week. Each 20 minute bout of interval sprinting will consist of 60 mini-sprints of 8 seconds followed by 12 seconds of easy pedaling. Exercise will be performed on a stationary bike and all sessions will be supervised by an exercise physiologist. All women must complete 24 exercise sessions and must make up a session if one session is missed. Exercise training will be carried out in small groups of between 2 and 3 women.
Sponsors
UNSW
Study design
Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Prevention
Masking
Open (masking not used)
Eligibility
Sex/Gender
All
Age
45 Years to 55 Years
Healthy volunteers
No
Inclusion criteria
Free of heart disease or any other disease that would prevent exercise training, BMI between 28 and 35. No recent history of exercise training. Age between 45 and 55 years. A normal resting ECG.
Exclusion criteria
Type 2 diabetes, smoker, history of heart disease and any other disease that would prevent exercise training, BMI of less than 28 or greater than 35, any medication that would negatively interact with exercise training (eg beta blockers), age less than 45 years or greater than 55 years. An abnormal resting ECG.
Outcome results
None listed