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Biomedical subjects

V L Katch

Publications and source records attributed to V L Katch.

At least 55 records · Page 3Linked to original sources
PubMed1979

Effects of exercise intensity on food consumption in the male rat.

The effects of two different levels of exercise of equal caloric cost on food consumption and body weight changes was investigated in 24 male rats (initial body weight = 378.3 g, SD = 22.3 g). Open circuit spirometry was used for the collection of respiratory gas exchange during running on the treadmill and these data were used to equate two intensities of exercise to the same caloric expenditure. Food consumption was measured 1 hr, and every 4 hr thereafter for 24 hr during 2 alternate weeks of exercise and rest. Results showed that high intensity exercise (16 m . min-1, 10% mill grade) resulted in depressed food consumption and depressed body weight gain than low intensity exercise (5 m . min-1, zero percentage mill grade) of equal caloric expenditure. Both exercise groups had depressed food consumption and rate of body weight change compared to nonexercise animals.

Animals↗
PubMed1979

Cardiac output differences in males and females during mild cycle ergometer exercise.

To study sex differences in cardiac output during submaximum exercise, eight male and eight female subjects were matched on max Vo2 (1 min-1 and ml kg-1 min-1). Each subject performed one, eight minute submaximum bicycle ergometer test at 35% of Vo2max (300 kpm min-1). At a steady state mean Vo2 of 0.96 1 min-1, cardiac output was determined. Significant differences between men and women were observed (p less than .05) in cardiac output, stroke volume and (a-v) O2 difference. The males had a lower cardiac output (1.75 1 min-1) and stroke volume (17.2 ml beat-1) and a higher (a-v) O2 difference (2.01 vol %). When these variables were expressed independent of lean body weight the above differences were non-significant. It was suggested that cardiac output differences between the sexes during mild exercise are due, in part, to differences in lean body weight.

Adult↗
PubMed1978

Routine anthropometry and arm radiography in assessment of nutritional status: its potential.

Elementary anthropometric and radiographic techniques, carefully executed and routinely employed in definitive surveys of healthy persons, are of potential value in assessment of patients, and provide the following: 1. Formulas to compute mean "ideal body weights" of young adults from stature (W = kh1.7). 2. A "unit size-weight" index (uS-W) with a mean value of 100 or nearly identical to 100 for all mean "ideal weights" relative to stature. 3. The distribution of values of the uS-W index for 80 and 90% of the population of young adults around the mean. 4. Conversion of body girths and stature to ponderal equivalents such that component A reflects fatness (if present) and component B, leanness and muscularity. 5. Conversion of skeletal diameters and stature to a relative "frame" size weight, designated component C, and employed as a "reference weight" (Ref W) for the calculation of lean body weight (LBW) in the male, and "minimal weight" as well as LBW in the female. 6. Conversion of skinfold thickness to estimates of body fat by means of a surface area formulation where: Weight of fat = SA x skinfold widths x k(fat). 7. The introduction of comprehensive arm radiography to reveal presumptive estimates of body fat from SA and of the amount of bone and muscle in the arm to LBW. 8. The visualization of body shape in the somatogram, and the value of photography under strictly controlled conditions.

Adolescent↗
PubMed1977

Prevalence of coronary heart disease risk factors in active children, 7 to 12 years of age.

Forty-seven active boys and girls, 7 to 12 years of age, underwent a comprehensive medical and physical evaluation in order to assess their prevalence of single and multiple coronary heart disease risk factors. Each subject received a densiometric determination of body composition, blood lipid analysis, pulmonary function and a physical work capacity test to assess their peak oxygen consumption (Vo2max). Obesity (greater than 25% fat), elevated triglycerides (greater than 100 mg %) and the presence of Type IV hyperlipoproteinemia appear to be the more predominant risk factors. Twenty-nine (62%) of the children had at least one risk factor. Of these, seventeen had two or more risk factors with one subject having as many as five factors.

Blood Gas Analysis↗