Impact of Physical Activity on Left Ventricular Mass and Lipid Metabolism
| Status: | Active, not recruiting |
|---|---|
| Conditions: | Cardiology, Orthopedic, Gastrointestinal |
| Therapuetic Areas: | Cardiology / Vascular Diseases, Gastroenterology, Orthopedics / Podiatry |
| Healthy: | No |
| Age Range: | 18 - Any |
| Updated: | 10/28/2017 |
| Start Date: | February 2011 |
| End Date: | January 2019 |
Impact of Physical Activity on Left Ventricular Mass and Lipid Metabolism in Healthy Female Volunteers Training for a Marathon
Prospective study on the structural and functional changes in the heart of adult women
assessed by echocardiogram and in lipid metabolism that occur in response to physical
training. Using echocardiogram we will characterize the early determinants of "athletic
remodeling". We will also assess the effect of intense physical training on lipid metabolism,
focus on HDL subspecies and function.
assessed by echocardiogram and in lipid metabolism that occur in response to physical
training. Using echocardiogram we will characterize the early determinants of "athletic
remodeling". We will also assess the effect of intense physical training on lipid metabolism,
focus on HDL subspecies and function.
Left ventricular hypertrophy, defined as an increase in the mass of the left ventricle may
occur as a physiologic response to exercise (athletic remodeling aka "athletic heart"), but
is most frequently encountered as a pathological manifestation of cardiovascular disease. The
early determinants of athletic remodeling in the general population are largely unknown. In
order to longitudinally explore the early determinants of athletic remodeling, we will
recruit from the community, physically untrained women who have volunteered to run a
marathon. We will prospectively assess left ventricular mass and function by echocardiogram
during three consecutive stages/visits:
- Baseline: prior to starting intense physical training
- Trained: at the end of at least 12 week training period, prior to running the marathon.
- Post-marathon: 6 weeks after running the marathon.
In addition, exercise impacts lipid metabolism and short-term exercise is known to increase
HDL levels in plasma. Human HDL is structurally heterogeneous, comprising at least sixteen
discrete species. It has multiple functions, pertinent to cardiovascular medicine such as the
ability to accept effluxed cholesterol from the artery wall, culminating in sterol uptake in
the liver. This "reverse cholesterol transport pathway" is thought to prevent the
accumulation of cholesterol in the artery wall. We will assess the clinical and genetic
determinants of the HDL response to physical exercise.
occur as a physiologic response to exercise (athletic remodeling aka "athletic heart"), but
is most frequently encountered as a pathological manifestation of cardiovascular disease. The
early determinants of athletic remodeling in the general population are largely unknown. In
order to longitudinally explore the early determinants of athletic remodeling, we will
recruit from the community, physically untrained women who have volunteered to run a
marathon. We will prospectively assess left ventricular mass and function by echocardiogram
during three consecutive stages/visits:
- Baseline: prior to starting intense physical training
- Trained: at the end of at least 12 week training period, prior to running the marathon.
- Post-marathon: 6 weeks after running the marathon.
In addition, exercise impacts lipid metabolism and short-term exercise is known to increase
HDL levels in plasma. Human HDL is structurally heterogeneous, comprising at least sixteen
discrete species. It has multiple functions, pertinent to cardiovascular medicine such as the
ability to accept effluxed cholesterol from the artery wall, culminating in sterol uptake in
the liver. This "reverse cholesterol transport pathway" is thought to prevent the
accumulation of cholesterol in the artery wall. We will assess the clinical and genetic
determinants of the HDL response to physical exercise.
Inclusion Criteria:
- Healthy adult men or women, aged 18 years or older
- Voluntarily signed up for a sport event or to run a marathon or a half marathon for
the first time
- Normal to mildly elevated blood pressure (systolic blood pressure < 140 mmHg and/or
diastolic blood pressure < 90 mmHg)
- Hormone replacement therapy and birth control pills are allowed, provided they have
been on a stable dose for more than 3 months and no change in dose is planned for the
duration of the study
- Capable and willing to provide written, informed consent for the study
Exclusion Criteria:
- History of cardiovascular disease within the past year (cardiomyopathy, heart failure,
ischemic heart disease, stroke, TIA, peripheral vascular disease)
- Change in body weight more than 10% over the past year
- History of significant medical conditions, including respiratory, gastrointestinal,
neuromuscular, neurological or musculoskeletal problems interfering with exercise.
- Autoimmune or collagen vascular diseases, chronic anemia,
- Malignancies in the past 5 years, with the exception of treated skin or breast cancer
that did not require treatment with chemotherapy.
- Diabetes
- Pregnancy or recent delivery: delivery date less than 3 months prior to enrollment
- Lipid lowering medications (statins, niacin, resins) are allowed, provided dose has
not changed for 3 months prior to enrollment and is not anticipated to change during
the study
- Fish Oil supplements are allowed, provided dose has been unchanged for 3 months prior
to enrollment and no change in dose is planned for the duration of the study.
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