Key result
Endurance exercise training for 11 weeks in 24 normal individuals increased left ventricular dimension, mass, shortening fraction, and contraction velocity compared to baseline.
Why the study?
Does 11 weeks of endurance exercise training alter cardiac structure and performance in normal individuals?
Observational (n=24)
Does 11 weeks of endurance exercise training alter cardiac structure and performance in normal individuals?
Endurance exercise training in normal individuals induces physiological cardiac remodeling characterized by increased LV dimension, mass, and improved systolic performance as measured by echocardiography.
Supports physiological LV remodeling with endurance training in healthy subjects; extends prior observations but remains hypothesis-generating for clinical populations.
Few data are available regarding the effects of exercise training upon cardiac structure and performance in man. We evaluated the echograms of 24 normals before (PRE) and after (POST) 11 weeks of endurance exercise training. Conditioning consisted of a walk-jog-run protocol at 70% maximal heart rate for one hour four days per week. Training reduced heart rate and increased maximal duration and estimated oxygen consumption of treadmill exercise. Compared to PRE, the echogram in the POST training period revealed an increased left ventricular (LV) end-diastolic dimension (EdD), a decreased end-systolic dimension (EsD) and thus an increased stroke volume (EdD3-EsD3) and shortening fraction (EdD-EsD)/EdD). Cardiac output (CO) and peripheral vascular resistance (BP/CO X 80) were identical PRE and POST conditioning. Importantly, an increase in mean fiber shortening velocity was observed POST training as were increases in LV wall thickness, ECG voltage of S in V1 + R in V5, and LV mass. Thus endurance training was accompanied by increases in both LV dimension and mass as well as LV shortening fraction and contraction velocity as observed by echocardiogram.
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DeMaria et al. (1978) conducted an observational in Healthy individuals (n=24). Endurance exercise training vs. Baseline (pre-training) was evaluated on Cardiac structure and performance (LV dimensions, mass, shortening fraction, contraction velocity). Endurance exercise training for 11 weeks in 24 normal individuals increased left ventricular dimension, mass, shortening fraction, and contraction velocity compared to baseline.
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