A Feasible High Intensity Interval Exercise Training Intervention in Phase II Cardiac Rehabilitation
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 20
- 试验地点
- 1
- 主要终点
- brachial endothelial function as measured by flow-mediated dilation (FMD)
研究概览
简要总结
This study will evaluate the effect of brief, intermittent stair climbing exercise on key cardiovascular and metabolic markers of health in individuals completing a cardiac rehabilitation program. Participants of this study will be placed into one of two exercise groups: one group will perform the standard exercise protocol currently being used by the Cardiac Health and Rehabilitation Centre at Hamilton General Hospital and the second group will perform a variation of interval exercise training, high intensity interval stair climbing.
详细描述
Cardiac rehabilitation (CR) is a recognized health service for the secondary prevention of CVD, unfortunately, CR is vastly underutilized, due to low referral rates and patient-related factors such as time commitment, travelling distance or user fees. After 2 weeks of CR exercise prescription, ~80% of patients opt to exercise independently rather than join a structured rehabilitation program in the community, suggesting that alternatives for current centre-based CR should focus on at-home programming with the intention of enhancing adherence and maintaining the lifestyle benefits long-term. The implementation of high-intensity interval exercise in CR programming has proven to be time-effective, enjoyable, safe, and capable of inducing similar if not superior cardiorespiratory responses, when compared to traditional, continuous CR programs. Recently, the benefits of interval stair climbing exercise in sedentary women were established, in that completing 3, 60 second bouts of high intensity stair climbing, 3 days/week for 6 weeks improved cardiorespiratory fitness, and represents a model of low-volume high-intensity interval training which is tolerable, effective and easily accessible for sedentary adults.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Supportive Care
- 盲法
- None
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Men and (post-menopausal) women
- •Registered to participate in the Cardiac Health and Rehabilitation Centre (CHRC) at the Hamilton Health Sciences General Division
- •History of previous myocardial infarction, coronary artery bypass graft, and/or percutaneous coronary intervention
- •Non-smoker (within 3-months)
- •Local resident, with transportation to the CHRC at the Hamilton Health Sciences General Division.
- •Ability to understand written and verbal instructions and provide written informed consent.
- •Stable medical therapy.
排除标准
- •Non-cardiac surgical procedure within two months
- •Positive exercise stress test (i.e. typical symptoms of chest discomfort and ECG changes or positive nuclear scan)
- •Myocardial infarction within two months; coronary artery bypass graft surgery within two months; percutaneous coronary intervention within one month
- •Baseline work capacity < 25 W
- •NYHA class II-IV symptoms of heart failure
- •Documented significant valve stenosis
- •Symptomatic peripheral arterial disease that limits exercise capacity
- •Uncontrolled supraventricular or ventricular dysrhythmia
- •Unstable angina
- •Uncontrolled hypertension (blood pressure >160/90 mmHg)
- •Documented chronic obstructive pulmonary disease (FEV1 <60% and/or FVC <60%)
- •Any musculoskeletal abnormality that would limit exercise participation
研究组 & 干预措施
High-intensity stair climbing exercise
3 x 60 seconds of stair climbing, at a vigorous pace as described by rating of perceived exertion, separated by 60 seconds of rest. Subjects will complete supervised sessions 3 times/week for 2 weeks, and then continue unsupervised for the following 10 weeks.
干预措施: High-intensity stair climbing exercise (Other)
standard cardiac rehabilitation exercise
Subjects will complete the traditional cardiac rehabilitation program, combination of aerobic and resistance exercise 2 times/week for 2 weeks, and then continue unsupervised for the following 10 weeks.
结局指标
主要结局
brachial endothelial function as measured by flow-mediated dilation (FMD)
时间窗: Change from baseline FMD at 12 weeks
This technique involves the placement of a blood pressure cuff around the forearm distal to the olecranon process (elbow). The cuff is inflated above systolic blood pressure to \~200 mmHg (in order to attain cessation of arm blood flow) and is held at this pressure for a period of five minutes. Continual measures of brachial artery diameter and blood flow velocity will be obtained using Doppler ultrasound. A 10 MHz probe will be placed on the upper arm (below the biceps) and moved around until the best signal is found. Images of brachial artery diameter and blood flow velocity will be taken at rest (before cuff inflation), prior to cuff deflation (end of five minute ischemic period), and following cuff deflation for two minutes.
次要结局
- cardiorespiratory fitness(Change from baseline stress test at 12 weeks)
- skeletal muscle capillary content(change from baseline capillary content at 12 weeks)
- cardiac diastolic function(change from baseline left ventricular values at 12 weeks)