Biomedical subjects

D A Kaufmann

Publications and source records attributed to D A Kaufmann.

10 recordsLinked to original sources

PubMed1987

Effects of aerobic and strength conditioning on pregnancy outcomes.

This study evaluated the effects of a physical conditioning program on pregnancy outcomes and the subjective pregnancy experience. Pregnancy outcomes included length of labor, mode of delivery, length of hospitalization, and gestational age, birth weight, and Apgar scores of newborn infants. Subjective data included level of tension, general physical comfort, and self-image. The 845 subjects in the study were divided into a control group (n = 393) and into groups of low, medium, and high levels of exercise (n = 82, 309, and 61, respectively). Exercise sessions consisted of treadmill or bicycle warm-up, individually prescribed exercises on weight-lifting equipment for arms, legs, abdomen, and back, and 1- to 2-mile workout on bicycle ergometer. Pregnancy outcomes were more favorable in the exercise groups, particularly the high-exercise group. Significant data included length of hospitalization, incidence of cesarean section, and Apgar scores. All patients reported positive subjective responses to the conditioning program.

Adult↗

PubMed1983

Cinematographical analysis of javelin throwing techniques of decathletes.

Th purpose of this study was to analyse by correlational methods the biomechanical factors involved in achieving the maximal distance thrown in the javelin event. Twelve Swiss decathletes and two world class javelin specialists were filmed by a high speed (102 fps) 16 mm camera throwing a total of 20 trials. The co-ordinates of the resulting cyclograms were processed by a computer programme and the results submitted to correlational analysis. The highest correlation was 0.76 between velocity at release and distance thrown. Other negative correlations were found between distance thrown and angle of the javelin with the horizontal (0.52) and distance thrown and throwing hand to contralateral foot distance during the last strides (0.67). Javelin specialists, who had longer throws than decathletes (mean = 79.03 m versus 54.29 m), had a smaller difference between the angle of attack and angle of release. The results suggest that in order to attain maximal distance thrown the javelin thrower should achieve positive acceleration during the running approach, effective thrusting with th right leg on the penultimate stride and carry the javelin during the last strides at the optimal angle of release (32 to 36 degrees).

Adult↗

PubMed1981

Biomechanical analysis of sprinting: decathletes versus champions.

The purpose of this study was to compare some biomechanical variables of decathletes and world class sprinters while running the 100 metre race. Sixteen Swiss national decathletes and three world class American sprinters were filmed by a 16 mm Locam (100 fps) camera at the 70 m mark of the race. The co-ordinates for a 26-point stick figure were digitised and then submitted to analysis by a computer programme which produced quantitative data for 12 biomechanical variables. The data indicated that world-class sprinters differed from decathletes in running the 100 m dash by having (1) an optimal combination of a larger stride length and higher stride frequency (2) a smaller thigh angle at contact which shortens the contact time (3) a larger stride landing angle (4) a greater average acceleration of the thigh angle was (5) a larger trunk angle which contributes to a larger trunk/thigh angle. Although other factors such as culture, training, physique and racial differences may influence differences in performance between American world-class sprinters and Swiss decathletes, these data do indicate that biomechanical variables may contribute to differences in 100 m dash performance.

Biomechanical Phenomena↗

PubMed1981

Pulmonary changes during marathon training: a longitudinal study.

The purposes of this study were (1) to confirm whether there were any differences between observed and predicted scores based on age, height, and sex in forced vital capacity (FVC), 1-second forced expiratory volume (FEV1.0), FEV1.0/FVC ratio, functional residual capacity (FRC), total lung capacity (TLC, FRC/TLC ratio, residual volume (RV), RV/TLC ratio, diffusing capacity of lungs for carbon monoxide (DCO), alveolar-capillary permeability (k'CO), and alveolar volume (VA) for 2 middle-aged non-smoking men who trained for and competed in three annual 26.2-mile marathon races and (2) to determine the magnitude and direction of changes in the observed scores for the three annual tests. The subjects trained from 45 to 70 miles/week for 52 weeks during the 3-year period. In the week after their annual marathon run they were measured in the above pulmonary variables. For the 3-year period of training subject A improved five pulmonary variables (TLC, FRC, FRC/TLC ratio, DCO, and k'CO) and had small decreases in function of the other six variables. Likewise, subject B improved three pulmonary variables (FRC, FRC/TLC ratio, and k'CO) and had small decreases in function of the other eight variables. It is not possible to draw statistical inferences to other populations from this data, but it does indicate that these subjects are in a state of good-to-great pulmonary health. Although random variations may account for some of the changes for these 2 subjects, it is possible that marathon training has inhibited some of the deterioration in pulmonary function as predicted from the regression with age by Kory.

Adult↗

PubMed1981