Positional and postural effects on systolic and diastolic parameters at rest: A Pilot Study.
Cardiff Metropolitan University
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Aim: The initial aim of this study was to investigate exercise effects on diastolic mechanical function to determine to what extent the diastolic phase of the cardiac cycle contributed to efficient exercise performance. However, due to a lack of clear exercise data; the study aims developed and restructured. Therefore, the new study aim was to run a pilot study to investigate the positional and postural effects on systolic and diastolic parameters at rest, with the intention of running a full research study into positional and postural effects on systolic and diastolic parameters during exercise. Methods: Five males (height: 1.80m ± 0.08m; weight: 80.2 ±7.2kg; age: 24 ± 5 years) volunteered to participate in, and completed the study. Physical fitness (measured via VO2 max and double-leg-press strength tests), and cardiac data (measured via echocardiography) was collected and recorded from all five participants. Results: During both systole and diastole, the peak twisting/untwisting velocity was higher in the seated position than the supine position. The time-to-peak twisting/untwisting velocity was also quicker in the seated position. Systolic twist peak was higher in the seated position than the supine position. Stroke volume and flow propagation velocity were both marginally higher in the seated position than the supine position Conclusion: These findings suggest that positional and postural factors affect the mechanical performance of the left ventricle at rest.
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