Sex-specific associations of moderate and vigorous physical activity with physical fitness in adolescents     

T. Kidokoro  H. Tanaka  K. Naoi  K. Ueno  T. Yanaoka  K. Kashiwabara 《European Journal of Sport Science》2016,16(8):1159-1166

The present study examined the sex-specific associations of moderate and vigorous physical activity (VPA) with physical fitness in 300 Japanese adolescents aged 12–14 years. Participants were asked to wear an accelerometer to evaluate physical activity (PA) levels of various intensities (i.e. moderate PA (MPA), 3–5.9 metabolic equivalents (METs); VPA, ≥6 METs; moderate to vigorous PA (MVPA), ≥3 METs). Eight fitness items were assessed (grip strength, bent-leg sit-up, sit-and-reach, side step, 50?m sprint, standing long jump, handball throw, and distance running) as part of the Japanese standardised fitness test. A fitness composite score was calculated using Japanese fitness norms, and participants were categorised according to their score from category A (most fit) to category E (least fit), with participants in categories D and E defined as having low fitness. It was found that for boys, accumulating more than 80.7?min/day of MVPA may reduce the probability of low fitness (odds ratio (ORs) [95% confidence interval (CI)]?=?0.17 [0.06–0.47], p?=?.001). For girls, accumulating only 8.4?min of VPA could reduce the likelihood of exhibiting low fitness (ORs [95% CI]?=?0.23 [0.05–0.89], p?=?.032). These results reveal that there are sex-specific differences in the relationship between PA and physical fitness in adolescents, suggesting that sex-specific PA recommendation may be needed to improve physical fitness in adolescents.  相似文献   

Why does language matter to education?     

Prof. Dr. Yasuo Imai 《Zeitschrift für Erziehungswissenschaft》2011,14(3):489-500

Discussions concerning ??literacy?? make it clear that the domain of language has become a focal point for educational policy. In such discussions, language is primarily treated as a basic communication tool. This paper examines, from a philosophical perspective, how appropriate this approach to language is. The philosophical validity of this dominant tendency is analyzed with reference to the work of Wilhelm von Humboldt, Nietzsche, and Wittgenstein. Once the stable relationship conceived by Humboldt among the individual, language, and the world is lost, education displays its more distinctive features, which we see clearly in Nietzsche and Wittgenstein. Both of these philosophers focused their investigation on the rhetorical or performative aspects of language. In contrast to Nietzsche, however, Wittgenstein did not abandon the hope of finding in language the function of showing reality, even if what is said and what is shown remain incongruent. This perspective in Wittgenstein is salient against the dominant tendency, in which the mediating function of language is sought in the dimension of conformity and usefulness.  相似文献   

TELEVISION IN LABORATORY GUIDANCE: PRACTICAL AND PHILOSOPHICAL BASES     

Kiyoomi Tanaka  Masao Takagi 《Learning, Media and Technology》1977,3(1):13-14

At the University of Electro‐Communications instruction is given on fundamental electricity in accordance with the educational principles derived from the philosophy of ‘Zen’. On the technical side, CCTV interphones and other audio‐visual aids are employed. In particular, we have inaugurated a remote instruction method called ‘TV‐Interphone’, abbreviated to T.I. method, through which we give personal guidance to students in the conduct of their experiments. Data from the experiments are fed into a computer which was installed in the laboratory for control processing

Three courses are provided:

1. 1. Electrical Measurements and Characteristics of Analogue and Digital Circuits.

2. 2. Electrical Measurements and Characteristics of Advanced Analogue Circuits

3. 3. Design and Experiment

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Muscle cross-sectional areas and performance power of limbs and trunk in the rowing motion     

Tachibana K  Yashiro K  Miyazaki J  Ikegami Y  Higuchi M 《Sports biomechanics / International Society of Biomechanics in Sports》2007,6(1):44-58

Although it is clear that rowers have a large muscle mass, their distribution of muscle mass and which of the main motions in rowing mediates muscle hypertrophy in each body part are unclear. We examine the relationships between partial motion power in rowing and muscle cross-sectional area of the thigh, lower back, and upper arms. Sixty young rowers (39 males and 21 females) participated in the study. Joint positions and forces were measured by video cameras and rowing ergometer software, respectively. One-dimensional motion analysis was performed to calculate the power of leg drive, trunk swing, and arm pull motions. Muscle cross-sectional areas were measured using magnetic resonance imaging. Multiple regression analyses were carried out to determine the association of different muscle cross-sectional areas with partial motion power. The anterior thigh best explained the power demonstrated by leg drive (r2 = 0.508), the posterior thigh and lower back combined best explained the power demonstrated by the trunk swing (r2 = 0.493), and the elbow extensors best explained the power demonstrated by the arm pull (r2 = 0.195). Other correlations, such as arm muscles with leg drive power (r2 = 0.424) and anterior thigh with trunk swing power (r2 = 0.33 5), were also significant. All muscle cross-sectional areas were associated with rowing performance either through the production of power or by transmitting work. The results imply that rowing motion requires a well-balanced distribution of muscle mass throughout the body.  相似文献   

The positioning and practices of the ‘feminized fan’ in Japanese soccer culture through the experience of the FIFA World Cup Korea/Japan 2002     

Toko Tanaka 《Inter-Asia Cultural Studies》2013,14(1):52-62

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The locker room : Eroticism and exoticism in a polyphonic text     

Greg Tanaka Cindy Cruz 《International journal of qualitative studies in education》2013,26(1):137-153

Critical race theory now encompasses a polyphonic telling of story in which multiple, shifting identities are seen in relation to each other and situated within historical contexts. Locating the fictive voice of an administrator forced to deal with change at a small private university, the article begins with a flashback to confrontations demanding that he reexamine his positions in relation to both work and social life. The second part of the article is an analytic discussion of the voices of narrator and other actors and concludes with a critical reconceptualization of polyphony. Much in the same way that critical race theorists have injected story-telling into legal scholarship in order to deconstruct and then reconstruct knowledge, the authors urge education researchers to move away from methodologies and systems of analysis that derive from white liberal discourse and ironically serve to maintain the status quo by leaving in place conservative structures and reward mechanisms.  相似文献   

Relationship between Achilles tendon properties and foot strike patterns in long-distance runners     

Keitaro Kubo  Daisuke Miyazaki  Shigeharu Tanaka  Shozo Shimoju  Naoya Tsunoda 《Journal of sports sciences》2015,33(7):665-669

The purpose of this study was to investigate the relationship between Achilles tendon properties and foot strike patterns in long-distance runners. Forty-one highly trained male long-distance runners participated in this study. Elongation of the Achilles tendon and aponeurosis of the medial gastrocnemius muscle were measured using ultrasonography, while the participants performed ramp isometric plantar flexion up to the voluntary maximum. The relationship between the estimated muscle force and tendon elongation during the ascending phase was fit to a linear regression, the slope of which was defined as stiffness. In addition, the cross-sectional area of the Achilles tendon was measured using ultrasonography. Foot strike patterns (forefoot, midfoot and rearfoot) during running were determined at submaximal velocity (18 km · h^?1) on a treadmill. The number of each foot strike runner was 12 for the forefoot (29.3%), 12 for the midfoot (29.3%) and 17 for the rearfoot (41.5%). No significant differences were observed in the variables measured for the Achilles tendon among the three groups. These results suggested that the foot strike pattern during running did not affect the morphological or mechanical properties of the Achilles tendon in long-distance runners.  相似文献   

教育不能只为争第一     

Yasuo Tanaka  陈涵石 《教师博览》2010,(9):5-5

有一些孩子非常在意“第一”．如果没争到第一就会生气或者哭闹,并产生恐慌和不安。对于教师来说,要分清“第一”是对排名的偏执,还是对场所的偏执。  相似文献   

Behavioral field analysis in two strains of rats in a conditioned defensive burying paradigm     

Akira Tsuda  Yoshishige Ida  Masatoshi Tanaka 《Learning & behavior》1988,16(3):354-358

Two strains of rats (albino Wistar and hooded PVG/c) were exposed to a conditioned defensive burying paradigm that consisted of placing rats in a test chamber with bedding material on the floor, shocking them with a shock prod, and recording the time each rat spent in burying responses toward the prod. Various behaviors other than burying (freezing, grooming/paw licking) were observed by a time-sampling procedure during the control, conditioning, and extinction sessions, each of which was 15 min in duration. Wistar rats generally showed behavioral inhibition, as evidenced by less burying, lower exploratory and ambulatory behavior, and higher freezing behavior. PVG/c rats spent significantly more time engaged in burying and accumulated more bedding material in the conditioning session than did the Wistar rats. No significant differences between the two strains of rats were observed during the extinction session in terms of these measurements. The results indicate that Wistar rats have a greater tendency to freeze when coping with the noxious stimulus in a conditioned defensive burying paradigm, whereas the dominant coping style for PVG/c rats is defensive burying.  相似文献   

日本的学力问题   总被引：3，自引：0，他引：3  

田中耕治  高峡 《教育科学研究》2007,(7):54-57

一、引言从1999年上半年起,随着倡导“综合学习时间”(以下简称“综合学习”)的新学习指导要领的颁布(1998年),诸如“学力低下”、“学力危机”、“学力崩  相似文献