レスリングにおける両足タックルの技術獲得に関する研究

　　Wrestling is one of the popular sports in the world. In Japan, wrestling clubs for children are on the increase. But, technical acquisition isn’t clear in wrestling. The purpose of this study is collecting the basic data for technical acquisition of double-leg dive. As a result, each technique included in double-leg dive was a difference in acquisition rate. The present result suggested that continuation of technical training leads to acquisition of double-leg dive in wrestling

レスリング選手の海外合宿時におけるコンディショニングに関する事例的研究

　　Globalization of sports has rapidly advanced, leading to various challenges for conditioning during competitions and camps in other countries. This study conducted a survey to collect basic data about the conditioning of student wrestlers in Japanese and international camps. The subjects were 18 student wrestlers who were scheduled to compete in the All- Japan Student Championship Tournament and participated in both international and Japanese training camps at the Korea National Sport University (Seoul Special City, Republic of Korea, March 2014) and Agatsuma-gun, Gunma prefecture. We conducted a questionnaire-based survey at Japanese and international (Korea) camps. The results showed that body weight was significantly reduced during the last half of the Japanese camp, compared to that in the Korean camp. The dietary survey also showed that much spicy food was served during the camp in Korea, resulting in abnormal bowel movements. The results of our survey showed that it is important to provide prior education about dietary management and the use of supplements during international training camp

Frequency and Clinical Implication of the R450H Mutation in the Thyrotropin Receptor Gene in the Japanese Population Detected by Smart Amplification Process 2

In Japanese pediatric patients with thyrotropin (TSH) resistance, the R450H mutation in TSH receptor gene (TSHR) is occasionally observed. We studied the frequency and clinical implication of the R450H mutation in TSHR in the general population of Japanese adults using smart amplification process 2 (SmartAmp2). We designed SmartAmp2 primer sets to detect this mutation using a drop of whole blood. We analyzed thyroid function, antithyroid antibodies, and this mutation in 429 Japanese participants who had not been found to have thyroid disease. Two cases without antithyroid antibodies were heterozygous for the R450H mutation in TSHR. Thus, the prevalence of this mutation was 0.47% in the general population and 0.63% among those without antithyroid antibodies. Their serum TSH concentrations were higher than the average TSH concentration not only in subjects without antithyroid antibodies but also in those with antithyroid antibodies. The R450H mutation in TSHR is relatively common in the Japanese population and potentially affects thyroid function. The present study demonstrates that the SmartAmp2 method is useful to detect the R450H mutation in TSHR, which is one of the common causes of TSH resistance in the Japanese population

Age-Related Sex Differences in Glucose Tolerance by 75 g Oral Glucose Tolerance Test in Japanese

To elucidate the age-related sex difference in glucose tolerance, we conducted 75 g oral glucose tolerance tests in 1156 participants. Participants were divided into four groups, namely, young (22–29) males, young females, middle-aged (>50) males, and middle-aged females. According to the Japanese Clinical Practice Guideline for Diabetes 2019, the prevalence of normal glucose tolerance (NGT) was significantly lower in middle-aged than in young participants. The prevalence of high-normal fasting plasma glucose (FPG) was higher, and NGT was lower in young males (high-normal FPG 15.2%, NGT 82.0%) than young females (high-FPG 3.9%, NGT 94.3%). Combined glucose intolerance (CGI) was higher and NGT was lower in middle-aged males (CGI 10.2%, NGT 25.2%) than in middle-aged females (CGI 3.3%, NGT 39.8%). FPG and body mass index (BMI) were the lowest and Homeostatic model assessment beta cell function (HOMA-β) was the highest in young females, followed by young males, middle-aged females, and middle-aged males. Multiple linear regression analysis revealed that BMI weakly correlated with HOMA-β and Matsuda index in all subjects except young females. The superior glucose tolerance in females was apparent in young, but attenuated in middle-aged females. The differences are due to the higher insulin secretion potential and lower BMI in young females