Effects of a forty-week walking program of twelve miles per week on physical fitness, body composition, and blood lipids and lipoproteins in sedentary women escrito por Santiago, Mayra Carlota, Ph.D., University of Minnesota, 1990, 228 páginas; AAT 9033224

Resumen

Previously sedentary women (x age = 30 years) were randomly assigned to a walking (n = 16; X VO$\sb2$max = 32 ml$\cdot$kg$\sp{-1}\cdot$min$\sp{-1}$) or non-exercise control (n = 11; X VO$\sb2$max = 35 ml$\cdot$kg$\sp{- 1}\cdot$min$\sp{-1}$) group for the 40-week period.

The walking group walked three miles, four times per week on treadmills. Phase-I involved walking 56 minutes at 3.2 MPH and 5% grade. Phase-II entailed walking 53 minutes at a speed of 3.4 MPH and a grade of 6%. Phase-III involved walking 50 minutes at a speed of 3.6 MPH and 7% grade. Estimated training intensities were 62.8%, 71.7%, and 80.0% pre-VO$\sb2$max for Phase-I, -II, and -III. Overall exercise compliance was 89%. ANOVA's were conducted for all dependent variables. Follow-up independent t-tests were employed at each test level to identify the source of the differences. Additional analyses were performed on body composition, blood lipid and lipoprotein variables utilizing the Wilcoxon Matched-Pair Signed-Rank test.

VO$\sb2$max increased 22% (p $\leq$.05) from baseline for walkers and remained unchanged for controls. Walkers' submaximal responses to standardized exercise showed decreases (p $\leq$.05) in heart rate, pulmonary ventilation, respiratory exchange ratio, and ratings of perceived exertion (Borg Scale). Patterns of change (p $\leq$.05) were noted in body constitution for both walking and control groups as indicated by decreases in body weight, body mass index, sums of skinfolds, and fat weight for walkers and increases in body weight, body mass index, and sums of skinfolds for controls. Walkers maintained above average high density lipoprotein cholesterol levels throughout the 40 weeks, while controls exhibited an unfavorable decline (p $\leq$.05) in high density lipoprotein cholesterol over the study period. There were no significant changes in levels of total cholesterol, triglyceride, low density lipoprotein, or high density lipoprotein or its subfractions over the 40-week period. These data suggest that a long term, 12 mile per week walking program, in sedentary women, substantially increases cardiorespiratory fitness and decreases body fat. In contrast, long-term periods of physical inactivity results in an increase in body fat. This study also demonstrates that walking can reverse declines in high density lipoprotein cholesterol associated with progressive increases in fatness related to physical inactivity.

Índice (detalles del documento)

Director de tesis: Serfass, Robert C.

Universidad: University of Minnesota

Lugar de universidad: United States -- Minnesota

Fuente: DAI-A 51/06, p. 1951, Dec 1990

Tipo de fuente: Dissertation

Materias: Physical education, Public health

Número de la publicación: AAT 9033224

URL del documento: http://proquest.umi.com/pqdweb?did=747577541&sid=14&Fmt=2&cl

ientId=45091&RQT=309&VName=PQD

Código de documento de ProQuest: 747577541

Bases de datos seleccionadas: Dissertations & Theses

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