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The mechanical, hormonal and metabolic responses to two resistance loading schemesCrewther, Blair Tehira Unknown Date (has links)
The effective prescription of resistance exercise for strength and power development has been a source of debate amongst practitioners and sport scientist alike. One of the key issues in this area relates to the training load that would best facilitate strength and power adaptation. Heavy loads (>60-70% 1RM) have been traditionally used for maximal strength development by facilitating changes in neural function (strength) and muscle size (hypertrophy). However, many studies have now found lighter load (>45%1RM) training equally effective in improving both strength and hypertrophy. Similarly, many studies have found heavy load training effective in enhancing various measures of power though lighter loads (e.g. 45% 1RM) are thought to maximise the mechanical power output of muscle. Realising that adaptation depends upon some interaction between the mechanical, hormonal and metabolic stimuli, examining these responses would enhance our understanding of the underlying determinants of strength and power, and thereby improve strength and conditioning practice. Therefore, the purpose of this study was to examine the mechanical, hormonal and metabolic responses to equal volume light and heavy loading schemes. Eleven males (mean 26.6 ± 6.7 years; mean 79.0 ± 8.1 kg) with a minimum of 12 months weight training experience each performed two exercises (Smith squat and supine squat) at a light (45% 1RM) and heavy (88% 1RM) intensity. The light scheme consisted of eight sets of six repetitions, with six sets of four repetitions performed in the heavy scheme. Rest periods of three and four minutes respectively were used. Saliva sampling was used to determine the hormonal (cortisol and testosterone) and metabolic (lactate) responses. Samples were collected at rest (pre-), immediately after the first exercise (mid-), at the conclusion of the second exercise (P0) and every 15 minutes thereafter for one hour (P15, P30, P45, P60). Mean values for all variables were analysed with a paired sample T-test. Chances that the true effects were substantial (% and qualitative) were also calculated. No significant (P>0.05) difference in total forces was found between schemes; however, the light scheme produced significantly greater total time under tension (36%), total work (37%) and total power output (115%). Total impulse (38%) was the only variable found to be greater in the heavy scheme. A decrease in testosterone (TST) was observed in the heavy scheme (-4 to -29%) with no significant changes found across the light scheme (1 to 12%). Cortisol decreased in the light (-6 to -30%) and heavy (-14 to -44%) schemes until P45. An increase in the TST/cortisol ratio was observed in both the light (17 to 49%) and heavy (2 to 44%) schemes. Both loading schemes resulted in similar increases in lactate (0.3 to 1.0nmol/l). Equating two schemes by volume resulted in differential responses, many of which favoured the lighter scheme in terms of mechanical, hormonal and metabolic outputs. These findings suggest that load or intensity employed may be not as important as initially proposed and that other factors (e.g. volume, technique) may explain the similar strength and hypertrophy adaptation reported in studies comparing light and heavy schemes.
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The integration of exercise as an adjunct treatment for depression by clinical social workers in Massachusetts a study designed to expand the practice of area social workers : a project based upon an independent investigation /Lusignan, Thomas L. January 2007 (has links)
Thesis (M.S.W.)--Smith College School for Social Work, Northampton, Mass., 2007 / Thesis submitted in partial fulfillment for the degree of Master of Social Work. Includes bibliographical references (leaves 69-71).
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Variations in pulse deficit under conditions of controlled rest and controlled exerciseMavrelis, Penny. Reed, Virginia. January 1964 (has links)
Thesis (M.S.)--University of Michigan, 1964. / Title from half-title page.
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Muscle oxygenation does not affect the prior exercise effectHernández, Andrés, Gladden, L. Bruce. January 2009 (has links)
Dissertation (Ph.D.)--Auburn University, / Abstract. Vita. Includes bibliographic references (p.103-123).
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Lipid and lipoprotein metabolism in response to treadmill walking at two levels of caloric expenditure a comparison of black and white American men /Kushnick, Michael R. Moffatt, Robert J. January 2003 (has links)
Thesis (Ph. D.)--Florida State University, 2003. / Advisor: Dr. Robert J. Moffatt, Florida State University, College of Human Sciences, Dept. of Nutrition, Food and Exercise Sciences. Title and description from dissertation home page (viewed Sept. 15, 2005). Document formatted into pages; contains xi, 147 pages. Includes bibliographical references.
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The effect of leisure-based screen time on physical activity /Sperry, Mary Dawn, January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Exercise Sciences, 2005. / Includes bibliographical references.
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Exploring women's body image and exercise experience a qualitative study /Meyer, Barbara Sue, Steinhardt, Mary A., Bartholomew, John B., January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisors: Mary Steinhardt and John Bartholomew. Vita. Includes bibliographical references.
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The impact of exercise on mood effects of varying intensity and frequency /Murawski, Mary. January 2004 (has links)
Thesis (M.S.)--University of Florida, 2004. / Typescript. Title from title page of source document. Document formatted into pages; contains 41 pages. Includes Vita. Includes bibliographical references.
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A functional overhead pattern of motion in freemotion cable pulley exercise displays higher mean EMG activity than PNF and TherabandHughes, Michael Wayne. January 2005 (has links)
Thesis (M.A.)--University of North Carolina at Chapel Hill, 2005. / Includes bibliographical references (leaves 96-98). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
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A functional overhead pattern of motion in freemotion cable pulley exercise displays higher mean EMG activity than PNF and TherabandHughes, Michael Wayne. January 2005 (has links)
Thesis (M.A.)--University of North Carolina at Chapel Hill, 2005. / Includes bibliographical references (leaves 96-98).
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