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웜업 강도가 쇼트트랙 단거리 선수의 무산소성 운동수행능력과 경기력에 미치는 영향
김태훈,김도현,김은숙,윤성진 한국체육학회 2023 한국체육학회지 Vol.62 No.4
The purpose of this study is to provide data for efficient warm-ups by comparing blood lactate concentration and impacts of anaerobic exercises from high-intensity warm-up and moderate-intensity warm-up for short track speed skaters. of twelve short track speed skaters participated in the study. All were subjected to HIW(HRmax 80-90%) or MIW(HRmax 50-60%). After each warm-up, 30 seconds ergometer cycle test or short track 500m time trial were conducted twice. The time required for HIW and MIW was confirmed. After two 30 second ergometer cycle tests, peak power output and blood lactate concentration were measured. In addition the peak power output was meaningfully higher after HIW than MIW. blood lactate concentration was significantly higher in HIW than in MIW immediately after warm-up, after the first test, three minutes after the first test, after the second test and thirty minutes after second test. In the short track 500m time trial, in the first and twice record, HIW decreased with a meaningful difference compared to MIW. conclusion, when performed specified to characteristics of short track 500m, HIW increases anaerobic performance ability in both competition and improves the competition performance compared to MIW.
김태훈,장진화,윤석주,윤정희,장동우 한국임상수의학회 2010 한국임상수의학회지 Vol.27 No.3
The objective of this study was to measure densities in various areas of the normal canine lung with computed tomography (CT) depending on influences of gravity and the degree of lung inflation and to determine optimal positions and positive end expiratory pressure of canine lung for CT scanning. In each eight normal Beagle and Shihtzu dogs,a respiratory breathhold maneuver without spontaenous breathing at different positive end expiratory pressure (PEEP)of 0 mmHg, 10 mmHg and 20 mmHg was applied with the position of right and left lateral recumbency, sternal recumbency, and dorsal recumbency and spiral-CT scans of the total lung were acquired. Slices were selected at three levels through the apex, middle and basal lung at the aortic arch, carina and just above the diaphragm and lung density was measured in the dorsal, ventral, and lateral portions of the peripheral lung field. Lung density in dependent areas was higher than in nondependent areas (p < 0.05) regardless of species, positions, anatomic locations at the PEEP of 0 mmHg and 10 mmHg. However, no significant difference of lung density was found at PEEP of 20 mmHg in both species except the dorsal recumbency in Shihtzu dogs. This density gradient in the dependent areas is strongly influenced by PEEP (p < 0.05). In the four positions on the CT gantry, the lung density at the dependent and nondependent location of the lung was greater at the aortic arch than at the base (p < 0.05). Lung density decreased on identical location according to increase of PEEP (p < 0.05). There was no significant difference between right and left lung density at sternal and dorsal recumbency and no significant difference of the dorsal, ventral, and lateral portions of lung density at the right and left recumbency under identical pressure. It is implied that during chest CT scan with 20 mmHg of positive end expiratory pressure with right or left lateral recumbency, canine lung density do not influenced by gravity or anatomic location.