engleski

AVERAGE ENERGY CONSUMPTION DURING ONE DAY OF SKI SCHOOL-A POSSIBLE WEIGHT LOSS OPPORTUNITY?

During the skiing season, many recreational skiers choose to join the ski schools that provide the lessons for 3 to 4 hours per day, after which the skiers continue to ski in the afternoon. Even though the average daily activity time is high, many skiers overestimate the energy consumption and tend to overeat/ overdrink justifying that by the amount of the physical activity they were engaged in. Finally, a week of high calorie intake may lead to body mass increase instead of decrease. For that reason, the aim of this study was to estimate the average daily and hourly calorie consumption in regard to body mass of the skier. The sample comprised of 12 male skiers (average age 21±1, 3 ; average weight 82, 8±7, 2) whose ski day was organized as follows: they started the ski day with their instructor at 9.15 am and skied in a group until 1.15 pm. During that period they had one break of 20 minutes. In the afternoon, they skied ad libitum from 2 to 4 pm. The intensity was monitored by V800 Polar heart rate monitors from 8.30am until 4.30pm. The average estimated energy consumption was 2949, 5±288, 3 kcal per skiing day (min 2530 and maximum 3350). Out of 480 recorded minutes the active recorded time (active time equaled HR>50% of HRmax) was 273, 3±56, 5 min while the rest was either on ski lift or spent sitting during the breaks. Relative energy consumption was estimated to be 4, 51±0, 49 kcal·kg−1·h−1 or 4, 5 METs or 371±31, 4 kcal/h (active and passive time included in average values). Then we subtracted the energy that would be consumed during that time if the subjects were not skiing (for that equation the 1 MET for rest was used, meaning 1 kcal·kg−1·h−1). It lead to conclusion that the added energy consumption, which originated from skiing, was 288, 8±31, 0 kcal/h or 2312 additional kcal per skiing day. From the results we could conclude that during one week of skiing, that recreational skiers usually undertake, and 6 skiing days in that week, we can expect and additional 13872 kcal consumption which might lead to the maximal weight loss of 1, 8 kg in ideal conditions and with no food and drink compensation. The limitations of this study are the possibility of generalization of the obtained results on female, older and more experienced skiers which would probably consume much less energy than our subjects, who were young, male and beginner skiers.

alpine skiing, energy consumption, weight loss

nije evidentirano