Effects of Aerobic Exercise on Telomere Length in Patients With Systolic Heart Failure: A Randomized Clinical Trial.
试验速览
- 阶段
- 不适用
- 入组人数
- 24
- 试验地点
- 2
- 主要终点
- Biological Aging
研究概览
简要总结
The present study will analyze and compare the chronic effects of aerobic exercise in subjects with systolic heart failure on telomere length.
详细描述
Aging can be characterized by an organic and functional decrease, which is not related to disease, that is, a process that happens naturally over time. One of the markers of the aging process is telomeres, which consist of a complex of DNA sequences located at the ends of the chromosome, composed of protective proteins that have the function of protecting information from the DNA (genome), that is, telomeres are responsible for reconstructing the information lost during cell division due to the wear and tear of the chromosome ends. The telomere length may be shorter in some diseases, such as heart failure with reduced ejection fraction (HFREF) compared with healthy subjects.
The HFREF is a complex clinical syndrome of poor prognosis and high prevalence. Its characteristics include fatigue, dyspnea and intolerance to physical exertion due to reduction in cardiac output, concomitant with respiratory changes, weakness in peripheral muscles and incidence of depression. Exercise as a strategy for the treatment of heart failure (HF) can be effective in improving the quality of life, functional capacity and prognosis of the disease. In sedentary individuals who do not have HF, a natural reduction of telomeres occurs, which is associated with the early development of the aging process. Increasing or maintaining the size of telomeres can be a way to intervene in the aging process and thus slow the progression of HF, since one of its main functions is to protect the chromosome from cellular aging.
One of the most promising strategies for intervening in aging is the practice of physical exercise. However, the effects of physical exercise on the telomere length of individuals with HF are unknown. However, we know that physical exercise for HF shows positive results in relation to functional capacity, as measured by peak oxygen consumption (VO2peak). In addition, the improvement in functional capacity, increase in peak oxygen consumption (VO2peak), is directly related to the increase in telomere length. However, there is a lack of concise results in the literature regarding the chronic effects of aerobic exercise on the telomere length in subjects with HFREF.
Therefore, the aim of the present study will be to analyze and compare the chronic effects of aerobic exercise in subjects with HFREF on telomere length.
The specifics aims of this study are: to analyze and compare the chronic effects of aerobic exercise in individuals with HFREF in the following variables: Functional Capacity (Cardiopulmonary Exercise Testing); Echocardiographic Variables by Doppler echocardiogram; Endothelial Function measured by Flow-Mediated Dilation (FMD) of the Brachial Artery; Walking Ability measured by a Self-Selected Walking Speed Test (SSWST)
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Double (Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 50 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Primary diagnosis of HF with ejection fraction <40%;
- •Clinically stable patients with at least three months on optimal HF treatment;
- •Age between 50 and 80 years;
- •New York Heart Association (NYHA) functional class II to III;
- •No contraindications to participate in an exercise program;
- •Mentally able to understand instructions during the study.
排除标准
- •Severe valve disease;
- •Peripheral artery disease with symptoms of intermittent claudication;
- •Uncontrolled hypertension;
- •Drug or alcohol abuse;
- •Cognitive and/or osteomyoarticular conditions that prevent exercise;
- •Logistical impossibility of attending the hospital intervention;
- •Engaging in supervised physical exercise in the past three months;
- •Do not complete the run-in period.
结局指标
主要结局
Biological Aging
时间窗: 16 weeks
Telomere Length
次要结局
- Aerobic Capacity(16 weeks)
- Echocardiography Variables(16 weeks)
- Endothelial Function(16 weeks)
- SSWS(16 weeks)