Impact of Prolonged Sitting on Central Hemodynamics: Role of Intermittent Pneumatic Compression Therapy

<p>Prolonged sitting (3-6 hours) negatively impacts peripheral vascular health. Whether sitting similarly impacts central cardiovascular hemodynamics and vascular stiffness is unknown. <strong>Purpose: </strong>Determine if prolonged sitting increases central blood pressure, aortic pulse wave reflection and vascular stiffness. <strong>Methods:</strong> In 10 subjects (Age=22±2 yrs, BMI=28±4kg/m², 3 females), brachial artery pulse wave analysis was performed before (baseline-BL), during, and after 3 hours of sitting. Aortic pulse wave velocity (PWV) was examined before and after sitting using carotid applanation tonometry coupled with oscillometry performed on left upper-thigh. For mechanistic insight, intermittent pneumatic compression (IPC) was applied during sitting (i.e., 3, 120 mmHg compression cycles per minute, 30 mins on/off) in a sub-set (N=9). <strong>Results:</strong> During sitting, there was no change in heart rate (P>0.05); however, it tended (p=0.079) to be lower with IPC. No changes were noted for central blood pressure during sitting, with or without IPC (p>0.05). Augmentation pressure and index (AIx), wave reflection height and magnitude all exhibited significant decreases over course of sitting, most notable at 180 mins (e.g., AIx at BL=7±5, vs. 180 mins sitting=-3±3%, p=0.03). IPC appeared to mitigate these changes (sitting with vs. without IPC; AIx, 120 mins diff in mean=9.7%, p=0.018). No change was observed for aortic PWV in response to sitting, with or without IPC (p>0.05). <strong>Conclusion: </strong>Prolonged sitting decreases aortic pulse wave reflection but does not impact vascular stiffness. IPC tends to reduce heart rate and restrain central hemodynamic changes which may be the result of a reduction in venous pooling in the legs.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Masters Thesis

Discipline thesis:degree_discipline

Kinesiology

Year dc:date.available

2018

Author dc:creator

• Downey, Anna Kayleigh

Contributors dc:contributor

• Daniel Credeur
• Scott Piland
• Trenton Gould

• IPC
• PWA
• PWV
• Prolonged Sitting
• Central Hemodynamics
• Daniel Credeur
• Exercise Science

Repository record dc:identifier

https://aquila.usm.edu/masters_theses/366

OAI identifier oai:identifier

oai:aquila.usm.edu:masters_theses-1394