Browsing by Subject "Heart beat"
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Item Assessing the effects of the holiday season on body weight, body fat percentage, and blood pressure(2012-05) Fortenberry, Meagan; Cooper, Jamie A.; Boylan, Lee M.; Reed, DebraBackground: Longitudinal studies among U.S. adults show that average weight gain is 1kg per year. The purpose of this study was to assess the effects of the Holiday Season (Thanksgiving to New Years Day) on changes in body weight, body fat percentage (BF%), and blood pressure (BP) in adults. Methods: A total of 148 subjects (age 18-65y) were evaluated in November (baseline) and January (follow-up). Data collected at each visit included height, weight, BF%, BP, and resting heart rate (HR). In both visits, subjects were evaluated at the same time of day wearing a hospital gown, were instructed to refrain from vigorous exercise for 12 hours, and fasted for 4 hours prior to testing. BF% was measured using bioelectrical impedance analysis. Statistical significance was set at p < 0.05. Results: From baseline to follow up visits, there were significant increases in body weight (0.78±1.28kg), BF% (0.52±2.27%), systolic and diastolic BP (1.84±10.10mmHg and 2.32±14.20mmHg, respectively), and HR (2.32±11.52bpm). When analyzed by body mass index category, obese subjects showed a significantly greater increase in BF% from November to January compared to normal weight subjects (p < 0.02) and trended for a difference compared to overweight subjects (p= 0.09). Conclusions: Adult subjects showed an average increase in body weight of 0.78kg between baseline and follow-up visits. If these subjects gain the national average of 1kg per year, up to 78% of annual weight gain could be attributed to the holiday season. Additionally, obese subjects may be most at risk as they showed the greatest increases in BF%.Item Effects of hypnotic suggestion and biofeedback training upon the control of heart rate(Texas Tech University, 1979-05) McKay, William CliffordNot availableItem Heartbeat, performance and anxiety(Texas Tech University, 1977-12) Rembisz, Ronald StanleyNot availableItem The effect of neuraminidase on cell surface and beat rate of aggregated myocardial cells(Texas Tech University, 1981-05) Barron, Emily AnnMorphological as well as physiological changes occur in aggregated embryonic chick myocardial cells after treatment with the sialic acid removing enzyme, neuraminidase (NMDase). Aggregates of seven day embryonic chick ventricular cells were prepared according to a procedure developed by DeHaan, including a plating sequence to remove most of the contaminating cell types. While muscle cells made up the majority (90%) of the core of the aggregate, there was an incomplete layer of fibroblasts (10%) covering the periphery. These beating spherical clumps of cells were then treated with two highly purified preparations of Clostridium perfringens neuraminidase. Roth preparations of enzyme were contaminated with variable amounts of a protein which electrophoretically comigrated with a known standard of C^. perfringens phospholipase C. Therefore, phospholipase C was used as a control in both the beat rate and cell surface studies. The morphological effect of NMDase on the available myocardial cells present at the aggregate's periphery was visualized using polycationic ferritin controlled by pH and acid methylation procedures. NMDase treatment (1.2 Units/ml for 2 hrs. at 37° C) on both prefixed and postfixed aggregates showed a reduction in stain at the cell surface. Although lower concentrations or shorter treatment times with NMDase showed little morphological change from controls, physiological differences in aggregate beat rate could be detected with only 0.03 U/ml after ten minutes. NMDase concentrations, 0.03, 0.5, and 1.2 U/ml, showed net decreases in beat rates over a sixty minute incubation. Within this period, the first thirty minutes displayed definitive decreases in aggregate beat rate while the rest of the hour was typified by arrhythmic contractions. This study demonstrates that NMDase reduces the number of anionic sites at the cell surface of embryonic myocardial cells and also reduces the aggregate beat rate.