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스피드/쇼트트랙 빙상선수의 지도자 신뢰와 인지된 경기력의 관계에서 실패내성의 매개효과
김윤만 세계태권도문화학회 2019 세계태권도문화학회지 Vol.10 No.3
This study was processed for verification of the effect of leader trust on perceived performance in speed/short tract skaters and investigation of mediating effect on failure tolerance. The data were collected in the KSU 166 players with purposive sampling of nonprobability sampling. The collected data were analysed with SPSS 23.0 and AMOS 23.0 for confirmatory factor analysis, reliability analysis, descriptive statistical analysis, correlation analysis, and structure equation analysis. The study has gained the following results: First, leader trust of the skaters had positive effect on perceived performance. Second, leader trust of the skaters had positive effect on failure tolerance. Third, failure tolerance of the skaters had positively affect perceived performance. Fourth, failure tolerance of the skaters partial mediated the relationship between leader trust and perceived performance.
빙상선수들이 지각한 통제적 코칭행동, 실패내성 및 중도포기의도의 관계
김윤만 한국발육발달학회 2020 한국발육발달학회지 Vol.28 No.2
This study aims to investigate the relationship between controlling coach behaviors, failure tolerance and intention to give up in the middle of speed and short tract skaters. The data were collected in the KSU 168 players with purposive sampling of nonprobability sampling. The collected data were analysed with SPSS 23.0 and AMOS 23.0 for confirmatory factor analysis, reliability analysis, descriptive statistical analysis, correlation analysis and stepwise regression analysis. As a result, the conclusion is as follows. First, The controlled coaching behavior of skater coach had a significant impact on failure tolerance's failure behavior and task difficulty. Second, Threat factors during the skater coach's controlled coaching behavior had a significant effect the intention to give up in the middle. Third, The failure tolerance of the skaters did not affect the intention to give up in the middle. As such, the coach’s controlled coaching behavior perceived by skaters was found to increase the intention to give up with a positive effect on failure tolerance. In particular, in contrast to previous studies that controlling coaching behavior has a negative effect on athletes as a whole, the fact that reinforcement of coaching behavior was re-examined by the fact that compensation-based control can play a positive role in strengthening the failure tolerance of athletes. It is considered to be a meaningful result.
운동생리학: 500m와 5,000m 스피드 스케이트 경기시 혈중 젖산수준과 면역 글로블린수준의 변화
김윤만(YunManKim),김문희(MoonHeeKim) 한국체육학회 2002 한국체육학회지 Vol.41 No.5
The purpose of this study was to examine the responses to lactate, IgA, IgD, IgG and IgM of the speed skater performing a game under the real competition of 500m and 5,000m in the condition of coldness. Subjects, all male elite speed skaters were separated 500m group(N=4) 5,000m group(N=5). The blood sampling time of two groups were five times(rest, immediately after, recovery 1hour, recovery 2hour, recovery 6 hour). In the level of lactate, there were no significantly different in all events (500m, 5,000m groups), but there was significantly difference (p<.01) among the times (rest and immediately after, Recovery 1 hour, Recovery 2 hour, Recovery 6 hour). The pattern of change over time both groups for IgA, IgD, IgG and IgM were no significantly different. But the level of IgA was showed realistic difference between group in rest. Light physical activity or a moderate level of environmental stress stimulate the immune response, but exhausting physical activity or more severe cold stress have a suppressant effect, manifested by increase in susceptibility to viral infections.
운동생리학 : 한국인에서 ACTN3 단일염기다형성과 순발력관련 경기력의 관계
김철현(ChulHyunKim),김윤만(YoonManKim) 한국체육학회 2005 한국체육학회지 Vol.44 No.6
Alpha-actinin-3 is an actin-binding protein belonging to the spectrin protein superfamily. The gene expression of ACTN3 is limited to skeletal muscle, especially Type II muscle fiber which has highly force-generating capacity. This skeletal muscle-specific gene has homozygosiy for a common nonsense mutation resulting in α-actinin-3 deficiency. This deficiency does not outcome a disease phenotype. The ACTN3, However, is highly evolutionarily conserved, showing the possibility that it is redundant in humans. Researchers have suggested that this trait is related to muscle function at the extremes of mechanical-power performance. Therefore, we examined associations between the ACTN3 single nucleotide polymorphism and mechanical-power performance. For the study, we recruited 217 sprint or power elite athletes and 673 healthy adults. The results are following; Analysis of genotyping data showed highly significant differences in genotype frequencies between the groups. Mechanical-power athletes have 6.4%~14.9% of higher frequencies of RR genotype and 7.9%~12.6% of significantly lower of XX genotype than healthy adults. Also, there is differences in allele frequencies, which result in significantly higher frequencies of 577R allele and lower of 577X allele. These results suggest ACTN3 RR genotype and 577R allele are better for mechanical-power performance rather than endurance performance.
척수 좌상 후 트레드밀 운동에 의해 활성화된 Cdc2와 p-ERK1/2 단백질이 cavity 내에서 별아교세포의 증식과 축삭 재성장에 미치는 효과
서태범,김유미,최연주,김윤만,남궁욱,윤진환 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.4
Physical exercise is recommended as a therapeutic tool for improving functional and histological deficits in spinal cord contusion injury (SCI). Cell division cycle 2 (Cdc2) and Extracellular signal-regulated kinase 1/2 (ERK1/2) have been known to regulate proliferation of non-neuronal cells in both central and peripheral nervous system. Here we investigated the effect of activated Cdc2 and ERK1/2 by treadmill exercise on axonal regeneration of corticospinal tract and proliferation of astrocytes within the cavity after spinal cord contusion injury. The rats were divided into three groups: the control group (n = 20), the spinal cord injury group (n = 20), and spinal cord injury and treadmill exercise group (n = 20). We carried out Basso-Beattie-Bresnahan (BBB) test to determine functional recovery after spinal cord injury and treadmill exercise for 4 weeks significantly improved SCI-induced behavioral deficits (F = 25.457, p < .001). We also found that Cdc2 (F = 34.548, p < .001) and p-ERK1/2 expression (F = 311.507, p < .001) levels in the injured areas were further facilitated by treadmill exercise when compared to non-exercise group. Exercise-induced Cdc2 and p-ERK1/2 levels after SCI were associated with astrocyte proliferation within the cavity of the injury site. Also the results of present study suggested that treadmill exercise increased axonal sprouting of injured corticospinal tract post SCI. Our data provide evidence that treadmill exercise may be an important intervention for mediating axonal regeneration and biochemical alteration after SCI.