[A study on the effects of the physical load of instructors during ice skating camp]

The present study was conducted to estimate the effects of the physical load of instructors during ice skating camp. The subjects were 9 instructors aged from 20 to 24. To discover measures to relieve the physical load, we measured 1) urinary excretion of catecholamine (noradrenaline; NA, adrenaline; A), 17-OHCS, creatinine and nitrogen; N each day, 2) subjective symptoms of fatigue three time a day (morning, after skating, and at night), 3) nutrient intakes, 4) performed a time study and 5) measured the heart rate during skating instruction. The main results obtained were as follows: 1) The mean heart rate during skating instruction was 98.4-113.1 beats/min. 2) Urinary excretions of NA, A, and 17-OHCS were observed to have increased gradually during skating camp. The values of NA, A and 17-OHCS in the skating camp period were significantly higher than those of daily life. Subjective symptoms of fatigue were also increased gradually. The construction of symptom clusters was of the I-dominant type (I greater than III greater than II) at each point. 3) Intakes of energy, carbohydrate, protein and fat during the skating camp period were higher in comparison with those of daily life. 4) Urinary-N and creatinine levels during the skating camp period showed no changes. N-intake/urinary-N of the skating camp period tended to be higher than that of daily life. 5) In the time study, mean energy consumption was 3300-3400 kcal/day. The mean time of skating instruction was 218-227 min. The sleeping time was observed to have decreased gradually.(ABSTRACT TRUNCATED AT 250 WORDS)