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Article in English | WPRIM | ID: wpr-379110


The purpose of this study was to investigate the fluctuation of the recovery period of autonomic nervous activity (ANA) after isokinetic exercise. Sixteen male subjects participated in this study after they turned in their consent forms.The subjects performed isokinetic knee extension-flexion exercise using BIODEX. We obtained the electro-cardiogram during the entire experiment. We calculated their heart rate (HR) and power spectral of R-R interval (LF is low frequency component, and HF is high frequency component. Both indexes were converted to a logarithm transformation as to lnHF and lnLF.) from pre-exercise period (PRE) and post-exercise period (POST).Some researchers reported that ΔlnHF of POST was lower and ΔLF/HF of POST was higher than those of PRE immediately after aerobic exercise; however, this study's results were in complete contrast.In conclusion, we found that the recovery periods after aerobic and isokinetic exercises of ANA are entirely different.

Article in Japanese | WPRIM | ID: wpr-372120


The present study was aimed to investigate the physical ability of javelin throwers among uni-versity students using the magnetic resonance imaging (MRI), and Capacity Test, compared with other throwers.<BR>The anatomical cross-sectional areas (ACCAs) of trunk muscles were determined using MRI. Capacity Test is composed of 30 m sprint, standing triple jump from a double-legged, backward over the head shot, forward over the head shot, sargent jump, snatch, and shoulder flexibility test with a javelin.<BR>Results are as follows:<BR>1. The male javelin throwers (MJT) group showed significant correlation between javelin throw records and ASCAs per body mass of body trunk extensor muscles (r=0.722, p<0.05) .<BR>2. There was significant correlation between the forward over the head shot, and javelin throw in MJT group (r=0.800, p<0.01) . And the same tendency was also seen in female javelin throwers (FJT) group (r=0.735, p=0.055) .<BR>3. The MJT group showed some correlation between javelin throw records and ASCAs per body mass of psoas major muscle (r=0.657, p=0.060) .<BR>By the above-mentioned results, it was considered that the trunk extensors are important for male javelin throwers.

Article in Japanese | WPRIM | ID: wpr-371533


Changes in the amount of urinary protein and β<SUB>2</SUB>-microglobulin (β<SUB>2</SUB>-MG) were observed after middle-distance running in 46 primary school boys, 46 junior high school boys, 74 high school boys and 51 male college students, aged between 6 and 21 years.<BR>The running distance was varied according to age : 800 m for 6- to 7-year-olds, 1, 200 m for 8- to 9-year-olds, 1, 700 m for 10- to 11-year-olds and 1, 500 m for 12- to 21-year-olds.<BR>Urine was collected from each subject before and 30 min after running, and total urinary protein was analyzed by the Lowry method and β<SUB>2</SUB>-MG by the reverse passive hemagglutination method.<BR>For all subjects at rest, total urinary protein was 14.2-19.1 mg/d<I>l</I> on average and increased to 24.6-96.2 mg/d<I>l</I> at 30 min after running, while β<SUB>2</SUB>-MG at rest was 3.10-7.12 μg/d<I>l</I> and increased to 30.53-1202.87 μg/d<I>l</I> at 30 min after running.<BR>Urinary protein originating in blood plasma and that in non-blood plasma was calculated on the basis of the study of Poortmans (1968) . Urinary protein originating in blood plasma after running was 2.54-6.58 times higher than that before running, whereas non-blood plasma after running was 1.04-1.92 times higher than that before running. This suggests that the increased urinary protein after running mainly originates from blood plasma. In terms of age, urinary protein from non-blood plasma in boys aged 6 to 11 years showed a greater increase than that in boys over 12 years old.<BR>The ratio of β<SUB>2</SUB>-MG to urinary protein after running was 7.0-80.6 times higher than that before running. The correlation coefficient between urinary protein and β<SUB>2</SUB>-MG became higher after running than that before running. These findings indicate that low-molecular-weight urinary protein is predominantly reabsorbed in the proximal renal tubule. In terms of age, the increase in the above ratio in 12-14-year-olds was lower than that in 1521-year-olds, suggesting that the reabsorption ability of the proximal renal tubule matures with age.

Article in Japanese | WPRIM | ID: wpr-371455


Body condition and nutritional intake of female competitive gymnasts (four athletes who participated in Universiade championships and seven athletes who passed preliminary trials for World championships) were investigated during intensive training camp, where they improved their technical skill of gymnastics and regulated their body weight through body training and dietary intake.<BR>The results are summarized as follows;<BR>1) Daily energy intake, protein intake (per 1 kg of body weight) and iron intake during training camp of Universiade and World athletes were 1, 566±292 kcal (mean±standard deviation), 1.29±0.08 g/kg, 6.6±1.6 mg, 1, 367±267 kcal, 1.24±0.19 g/kg, 6.6±1.4 mg respectively on the average. Each intake of them was low during training camp.<BR>2) The lower their daily energy intake, the more their body weight decreased. High correlation between energy insufficient (needed energy minus intaked energy) per 1 kg of body weight and body weight losses was observed. And also, high correlation between decrease of body weight and proportion of energy intake per basal metabolism was observed.<BR>3) Changes in body composition during the first training camp were detected; decrease of their body weight, body fats and lean body masses. Compared with the second training camp, the amount of body fats decreased, while the amount of lean body masses increased.

Article in Japanese | WPRIM | ID: wpr-377415


Environmental contamination caused by the organochlorine pesticides (OCPs), such as BHC and DDT, as well as polychlorinated biphenyls (PCBs), is an important problem because of their accumulation in human bodies due to their high lipophilic properties and high chemical stability. In this study, we have investigated the actual condition of the BHC, DDT and PCB levels in the plasma of farmers in the three districts of Japan and in China. At the time of the blood sampling, about 10years had passed since the use of OCPs was forbidden in Japan, whereas OCPs were being used in China.<BR>The blood samples were collected from following 4 districts:(a) Northern Kyushu (N =67), (b) Tomishiro in Okinawa prefecture (N=24), (c) Yokote in Akita prefecture (N = 36) and (d) Harbin in China (N =21).<BR>The results are as follows:<BR>1) β-BHC was detected in all of the 148 plasma samples with the range of 0.9-48.4 ppb. Percentage of the samples with the β-BHC level higher than 20 ppb was 2%(3 samples) for the Japanese and 57%(12 samples) for the Chinese.<BR>2) p, p'-DDT and p, p'-DDE were detected in all samples and total-DDT was ranged from 2.4 to 49.9 ppb. Percentage of the samples with the total-DDT level higher than 20 ppb was 43%(9 samples) for the Chinese and 8%(10 samples) for the Japanese. DDT level of Chinese was significantly higher than those of farmers in Northern Kyushu and Yokote.<BR>3) PCBs were detected in all of the Japanese samples (n=127) with the range of 1.1-22.8 ppb. Whereas the PCB level of 15 samples of Chinese women was less than 1.0 ppb and that of other 4 samples of Chinese men was higher than 10 ppb.<BR>From these results, regional difference in the residue of OCPs and PCBs in Japanese was discussed, besides the difference in that of OCPs beteween Japanese and Chinese was discussed in relation to the history of the use of OCPs.