Adverse effects of energy restriction on myogenic enzymes in judoists     

Takashi Umeda  Shigeyuki Nakaji  Tadashi Shimoyama  Youske Yamamoto  Manabu Totsuka  Kazuo Sugawara 《Journal of sports sciences》2013,31(4):329-338

In this study, we examined the effects of weight reduction by restricting energy intake on muscle function and serum concentrations of myogenic enzymes in judoists. Twenty-seven male judoists aged 19.3±0.6 years (mean±s) were divided into three groups based on the extent of body weight reduction: high weight reduction (height 1.70±0.05?m, body mass 78.5 ±13.6?kg), low weight reduction (height 1.70±0.05?m, body mass 80.7±13.1?kg) and a group that maintained body weight while continuing to perform exercise training (height 1.78± 0.07?m, body mass 78.7±8.8?kg). Body composition, blood biochemistry, energy intake and anaerobic power were assessed on four occasions: 20 days (baseline data), 4 days and 1 day before and 7 days after competition. Compared with baseline, body mass and fat-free mass were significantly lower 1 day before competition in the high and low weight reduction groups (both P?<0.01); these changes persisted for 7 days after competition in the high weight reduction group. Serum creatine kinase was significantly elevated 1 day before competition in all groups (all P?<0.05), and remained higher 7 days after competition in both the high and low weight reduction groups. Compared with baseline, maximal anaerobic power was significantly lower 1 day before competition only in the high weight reduction group (P?<0.01). Our results suggest that energy restriction in addition to intense exercise training before major competition has an adverse effect on anaerobic power and elevates serum creatine kinase concentration, leading to an impairment of muscular function and an increased susceptibility of muscle tissue to injury.  相似文献   

Sense-impression responses to differing pictorial and verbal stimuli   总被引：6，自引：6，他引：0  

Whitfield Bourisseau  O. L. Davis  Kaoru Yamamoto 《Educational technology research and development : ETR & D》1965,13(3):249-258

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Downhill walking training with and without exercise-induced muscle damage similarly increase knee extensor strength     

Sumiaki Maeo  Masayoshi Yamamoto  Hiroaki Kanehisa 《Journal of sports sciences》2016,34(21):2018-2026

This study examined whether avoiding or experiencing exercise-induced muscle damage (EIMD) influences strength gain after downhill walking training. Healthy young males performed treadmill downhill walking (gradient: ?28%, velocity: 5 km · h^?1 and load: 10% of body mass) 1 session per week for four weeks using either a ramp-up protocol (n = 16), where exercise duration was gradually increased from 10 to 30, 50 and 70 min over four sessions, or a constant protocol (n = 14), where exercise duration was 40 min for all four sessions. Indirect markers of EIMD were measured throughout the training period. Maximal knee extension torque in eccentric (?1.05 rad·s^?1), isometric and concentric (1.05 rad·s^?1) conditions were measured at pre- and post-training. The ramp-up group showed no indications of EIMD throughout the training period (e.g., plasma creatine kinase (CK) activity: always <185 U · L^?1) while EIMD was evident after the first session in the constant group (CK: peak 485 U · L^?1). Both groups significantly increased maximal knee extension torque in all conditions with greater gains in eccentric (ramp-up: +19%, constant: +21%) than isometric (+16%, +15%) and concentric (+12%, +10%) strength without any significant group-difference. The current results suggest that EIMD can be avoided by the ramp-up protocol and is not a major determinant of training-induced strength gain.  相似文献   

From Learning Beliefs to Achievement Among Chinese Immigrant and European American Preschool Children     

Jin Li  Yoko Yamamoto  Jamison M. Kinnane  Bree C. Shugarts  Clarence K.K. Ho 《Child development》2019,90(2):e230-e245

Little research exists on how immigrant children develop their beliefs about school learning (BASLs) in their home and host cultures. We examined the BASLs and achievement children of Chinese immigrants’ (CCI) and European American (EA) children. We followed longitudinally 120 middle-class children from age 4 to 5, balanced for gender. Children heard two story beginnings depicting a child eager to attend school and another not. Children completed the stories and were tested for math and literacy achievement. We found seven BASLs. CCIs and EAs showed similar BASLs. Awareness of parental involvement and intellectual benefit consistently explained their achievement, with CCIs showing greater achievement. CCIs’ (but not EAs’) valuation of learning explained their net academic growth. Implications on CCIs’ development are discussed.  相似文献   

Parental Expectations and Children's Academic Performance in Sociocultural Context   总被引：3，自引：0，他引：3  

Yoko Yamamoto  Susan D. Holloway 《Educational Psychology Review》2010,22(3):189-214

In this paper, we review research on parental expectations and their effects on student achievement within and across diverse racial and ethnic groups. Our review suggests that the level of parental expectations varies by racial/ethnic group, and that students' previous academic performance is a less influential determinant of parental expectations among racial/ethnic minority parents than among European American parents. To explain this pattern, we identify three processes associated with race/ethnicity that moderate the relation between students' previous performance and parental expectations. Our review also indicates that the relation of parental expectations to concurrent or future student achievement outcomes is weaker for racial/ethnic minority families than for European American families. We describe four mediating processes by which high parental expectations may influence children's academic trajectories and show how these processes are associated with racial/ethnic status. The article concludes with a discussion of educational implications as well as suggestions for future research.  相似文献   

Values, objectivity and credibility of scientists in a contentious natural resource debate     

Yamamoto YT 《Public understanding of science (Bristol, England)》2012,21(1):101-125

In contentious natural resource debates, the credibility of scientists is at risk. In this case study, citizens in contending communities and scientists in a forest management controversy constructed the scientists' credibility differently. Shared values and views of the nature of science and objectivity were primary factors for constructing scientists' credibility. Citizens who expected value-free, objective scientists to authenticate their knowledge were concerned about how the values of scientists on the opposite side affected research framing. Citizens who emphasized limited objectivity were less skeptical of scientists. Scientists acknowledged their values but defended their credibility in terms of professional standards, balance and resource constraints. In short, scientists' credibility is relative because each individual has unique values and views of the nature of science and objectivity. Through a collaborative policymaking process, citizens and scientists should develop shared values and visions to reconstruct a temporary, intersubjective sense of credibility.  相似文献   

Effects of intense exercise on the physiological and mental condition of female university judoists during a training camp     

Umeda T  Suzukawa K  Takahashi I  Yamamoto Y  Tanabe M  Kojima A  Katagiri T  Matsuzaka M  Totsuka M  Nakaji S  Sugawara N 《Journal of sports sciences》2008,26(9):897-904

To clarify the physical and mental fatigue caused by intense exercise and the relationship between the two types of fatigue, we examined changes in anthropometric and biochemical variables, neutrophil function, and the Profile of Mood States (POMS) questionnaire in 13 female university judoists attending a one-week training camp. Blood glucose, total cholesterol, haemoglobin, leukocyte count, IgG, and phagocytic activity all decreased after the training camp compared with baseline (P < or = 0.046). Aspartate aminotransferase, lactate dehydrogenase, creatine kinase, and neutrophil oxidative burst activity increased after the training camp (P < or = 0.007). Of the POMS scores, that for Fatigue increased after the training camp (P = 0.041) and that for Vigour decreased (P = 0.042). The changes in several POMS scores correlated with the changes in blood biochemical variables. In particular, the change in Total mood disturbance was negatively associated with changes in myogenic enzymes (P < or = 0.032). Our results suggest that intense exercise during training camps for female judoists leads to the appearance and accumulation of mental and physical fatigue, which are related to each other.  相似文献   

通过国际合作网络 建立世界一流大学——21世纪日中友好中的大学的使命与作用     

山本进一  早川操  沈晶晶;  徐晓纯; 《复旦教育论坛》2007,5(1):16-19

在当今高等教育日趋国际化的形势下,日本高校积极推动与世界上各地区的高校间的多元交流,共同探索新世纪中高等教育发展的各种问题。其中,如何推动与以东亚地区为中心的亚洲各国间大学交流的问题已成为人们所瞩目的焦点。今后,中日大学之间如何进一步推动实质性交流,提高研究教育交流成果等问题,是需要中日两国大学所共同关心的迫切课题。  相似文献   

Media Multitasking,Second Screening,and Political Knowledge: Task-Relevant and Task-Irrelevant Second Screening during Election News Consumption     

Weina Ran  Masahiro Yamamoto 《广播与电子媒介杂志》2019,63(1):1-19

This study tests the role of second screening during election news consumption in factual political knowledge. Data from an online survey conducted before the 2016 U.S. presidential election show that task-irrelevant second screening during election news consumption on television is negatively related to factual political knowledge, whereas the influence of task-relevant second screening is positive. Data also show that the relationships between task-relevant and task-irrelevant second screening and factual political knowledge are moderated by how much attention one pays to election news on television.  相似文献   

Stressful Events in the Lives of UK Children: a glimpse     

Kaoru Yamamoto  Jean Whittaker  O. L. Davis Jr 《Educational studies》1998,24(3):305-314

A total of 366 UK children in four different schools, one in Wales, one in Northern Ireland, and two in England, were asked to respond to 20 potentially stressful life experiences. Each event was rated on a scale ranging from 7 (the most upsetting) to 1 (the least), and the scale value and interquartile range were calculated. In addition, whether or not a given event was actually experienced was noted. Across the groups, there was a very high degree of agreement on all three measures, the median correlations being 0.95 for scale values, 0.70 for interquartile ranges, and 0.92 for incidence. Furthermore, the pooled UK results were found to correlate equally closely with the figures previously obtained in the USA and five other countries. The possibility of a prevalent ‘culture of childhood’, cutting across geo‐political boundaries and ethnic groupings, appears to receive further support.  相似文献