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Full-Text Articles in Life Sciences

The Neuroprotective Effects Of Endurance Training On The Aging Brain, Katelyn Norton Aug 2016

The Neuroprotective Effects Of Endurance Training On The Aging Brain, Katelyn Norton

Electronic Thesis and Dissertation Repository

Dysregulation of autonomic control often develops with advancing age, favoring a chronic state of heightened sympathetic outflow with parasympathetic withdrawal. However, the mechanisms of this age-related autonomic impairment are not known and may relate to alterations in brain structure (e.g. cortical atrophy) and/or altered neural function, particularly in regions related to the cortical autonomic network, namely, the medial prefrontal cortex (MPFC), insula cortex (IC), and hippocampus (HC). Exercise exerts beneficial effects on brain structure and, in the case of cognition, neurologic function; however, how exercise affects regions of the brain related to autonomic function are not known. This ...


Assessing Multi-Unit Muscle Sympathetic Nerve Activity Across Groups: A Multivariate Approach To A Multivariate Concept, Danielle N. Brewer Jun 2013

Assessing Multi-Unit Muscle Sympathetic Nerve Activity Across Groups: A Multivariate Approach To A Multivariate Concept, Danielle N. Brewer

Electronic Thesis and Dissertation Repository

Baseline muscle sympathetic nerve activity (MSNA) comparisons of age (young & old, n=40) and cardiovascular disease (CVD) state (young: Y, old: O, metabolic syndrome: MET, coronary artery disease: CAD, chronic heart failure: CHF, n= 36) groups were made to assess which MSNA variable(s) best describe group differences using a MANOVA-based approach across 10 variables. The hypothesis that action potential (AP) variables would better discriminate between groups than integrated variables was not supported. Burst frequency and incidence together significantly differentiated between groups with variability attributed to spikes/min and spikes/100hb removed. Significant group differences were noted for these variables ...


A Comparison Of Youth Participation Motives In Organized Sports, Kirsty L. Carrihill Jan 2003

A Comparison Of Youth Participation Motives In Organized Sports, Kirsty L. Carrihill

Legacy ETDs

Youth participation in organized physical activity has increased by more than 5 million in the last decade (Smith & Smoll, 2002). Of the 48 million youth 8 to 16 years old in the United States, 20 million participated in organized sport (Gould & Petlichkoff, 1998; Seefeldt & Ewing, 1997; Smith & Smoll, 2002). Currently, the average age for youth to begin participating in organized sports in, or outside of, school is 11 years old (Klint & Weiss, 1986; Smith & Smoll, 2002). Although participation rates have increased, there are significant numbers of youth who drop out of sport. Over one-third of all participants between the ages of 10 and 17 years of age withdraw from sport every year (Linder, Johns, & Butcher, 1991). Past research has shown there were gender differences in reasons for participating in sports and that boys were more likely than girls to participate in sports (Ewing, 1996). The purpose of this study was to investigate participation ...


One-Week Stability Of Forearm Venous Outflow As Assessed By Venous Occlusion Plethysmography, Jennifer Pitre Ortego Jan 2002

One-Week Stability Of Forearm Venous Outflow As Assessed By Venous Occlusion Plethysmography, Jennifer Pitre Ortego

LSU Master's Theses

The aim of this study was to test short-term and long-term reliability of venous outflow (VO) indices using the venous occlusion plethysmography technique. A secondary purpose was to compare venous measures to age, gender and various anthropometrical measures. The study group consisted of apparently healthy males and females, aged 18 to 80 years. Venous indices were under measures on two occasions (1 week apart), under the conditions of rest and following 5 min of upper arm occlusion. Venous outflow measures were calculated from the area under the curve (AUC) as well as the plethysmographic curve technique at the time .5 ...


Quadriceps Strengthening Daily Adjustable Progressive Resistance Exercise (Dapre) Technique Versus Delorme's Progressive Resistive Exercises (Pre) Techniques, Paul R. Cleveland Jan 1994

Quadriceps Strengthening Daily Adjustable Progressive Resistance Exercise (Dapre) Technique Versus Delorme's Progressive Resistive Exercises (Pre) Techniques, Paul R. Cleveland

Legacy ETDs

The purpose of this study was to determine if the DAPRE technique would significantly improve strength in the non dominant quadriceps muscle as opposed to Delorme's PRE technique for strengthening. Using a pretest posttest Cybex II strength test and applying a t-test for independent samples, it was found that after four weeks there was no significant difference between Group A (N=10) who exercised using Delorme's technique and Group B (N=10) who used the DAPRE technique It was concluded that possibly because of the low sample number, the short length of the exercise intervention, and using normal ...