Two Weeks of Remote Ischemic Preconditioning Alters Sympathovagal Balance

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2019-01-01
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Gardner, Richard
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Kinesiology
The Department of Kinesiology seeks to provide an ample knowledge of physical activity and active living to students both within and outside of the program; by providing knowledge of the role of movement and physical activity throughout the lifespan, it seeks to improve the lives of all members of the community. Its options for students enrolled in the department include: Athletic Training; Community and Public Health; Exercise Sciences; Pre-Health Professions; and Physical Education Teacher Licensure. The Department of Physical Education was founded in 1974 from the merger of the Department of Physical Education for Men and the Department of Physical Education for Women. In 1981 its name changed to the Department of Physical Education and Leisure Studies. In 1993 its name changed to the Department of Health and Human Performance. In 2007 its name changed to the Department of Kinesiology. Dates of Existence: 1974-present. Historical Names: Department of Physical Education (1974-1981), Department of Physical Education and Leisure Studies (1981-1993), Department of Health and Human Performance (1993-2007). Related Units: College of Human Sciences (parent college), College of Education (parent college, 1974 - 2005), Department of Physical Education for Women (predecessor) Department of Physical Education for Men
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Kinesiology
Abstract

Remote ischemic preconditioning (RIPC), elicited by brief, intermittent periods of ischemia followed by reperfusion, has cardioprotective effects. Our lab recently found that repeated bouts of RIPC improves microvascular function; however, it is unclear whether autonomic function would also be affected. We hypothesize that heart rate variability (HRV) will be altered following two weeks of repeated RIPC. Eleven healthy adults (age = 22 ± 2 years, 6 males, 5 females, BMI = 23.1 ± 3.4) performed two weeks of RIPC over 3 four-day periods, each separated by a one-day break. Each RIPC session consisted of 4 repetitions of 5 minutes of arm blood flow occlusion interspersed by 5 minutes of reperfusion. Before and one day after two weeks of RIPC, resting heart rate was collected with lead II electrocardiogram (ECG) while the participant was comfortably lying in a semi-recumbent position in a quiet, dimly lit thermoneutral environment. Power spectral density and symbolic dynamics were used to assess HRV from ~350 beat ECG segments. Two weeks of repeated RIPC decreased the percentage of 0V fragments (pre-RIPC = 13.1 ± 6.5%, post-RIPC = 6.9 ± 4.9%, P < 0.05) and increased the percentage of 2V fragments (pre-RIPC = 42.9 ± 12.1%, post-RIPC = 52.5 ± 10.0%, P < 0.01), while decreasing the LF/HF ratio (pre-RIPC = 1.1 ± 0.6, post-RIPC = 0.7 ± 0.3, P < 0.01). Thus, both the spectral and fractal analyses indicate that repeated RIPC shifts sympathovagal balance by increasing parasympathetic and decreasing sympathetic activity.

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