Abstract des Autors

Since 1976, a group of 300 boys and girls were measured longitudinally from age 13 till 22 years of age. Five times measurements were taken of anthropometry, (height, weight, width, circumferences and skinfolds) physiological measurements (aerobic power, isokinetic leg force, pulmonary ventilation) physical fitness (force, speed, flexibility, endurance), psychologic characteristics (personality traits, attitudes) and health indicators (blood pressure, serum lipids, A/B-type, life events, smoking). All interviews about habitual physical activity (incl. sports participation) and daily food intake (incl. Ca-intake) were performed. In 1991 100 females and 82 males could be remeasured at the age of 27. The drop-out percentage since the last measurement was 7.5%. Because at this age peak bone density can be expected, also a dual X-ray (DEXA) of the lumbal region (L2-L4) was made to estimate the bone mineral density (BMD). The results indicate that both sexes fall within the +/- 2 standard deviation for their age group. Preliminary analyses of relations between BMD in both sexes is significantly and positively related with muscle force and that this relationship is not apparent with aerobic power. Verf.-Referat