Changes in transverse relaxation time of quadriceps femoris muscles after active recovery exercises with different intensities

Abstract

The purpose of this study was to examine the changes in the metabolic state of quadriceps femoris muscles using transverse relaxation time (T2), measured by muscle functional magnetic resonance (MR) imaging, after inactive or active recovery exercises with different intensities following high-intensity knee-extension exercise. Eight healthy men performed recovery sessions with four different conditions for 20 min after high-intensity knee-extension exercise on separate days. During the recovery session, the participants conducted a light cycle exercise for 20 min using a cycle (50%, 70% and 100% of the lactate threshold (LT), respectively: active recovery), and inactive recovery. The MR images of quadriceps femoris muscles were taken before the trial and after the recovery session every 30 min for 120 min. The percentage changes in T2 for the rectus femoris and vastus medialis muscles after the recovery session in 50%LT and 70%LT were significantly lower than those in either inactive recovery or 100%LT. There were no significant differences in those for vastus lateralis and vastus intermedius muscles among the four trials. The percentage changes in T2 of rectus femoris and vastus medialis muscles after the recovery session in 50%LT and 70%LT decreased to the values before the trial faster than those in either inactive recovery or 100%LT. Those of vastus lateralis and vastus intermedius muscles after the recovery session in 50%LT and 70%LT decreased to the values before the trial faster than those in 100%LT. Although the changes in T2 after active recovery exercises were not uniform in exercised muscles, the results of this study suggest that active recovery exercise with the intensities below LT are more effective to recover the metabolic state of quadriceps femoris muscles after intense exercise than with either intensity at LT or inactive recovery.     

Enhancing the benefits of professional sport philanthropy: The roles of corporate ability and communication strategies

Building upon scholarly work on corporate associations, social identity, and corporate philanthropy, this study aimed to: (1) identify the effect of perceived corporate ability (CA) associations of professional sport organizations (PSO) on consumer support of their nonprofit partners and (2) understand communication strategies that enable PSOs to gain greater business benefits from their philanthropic activities. The results of an experiment supported the role of perceived CA in influencing consumer intentions to donate to a PSO's nonprofit partner, and further showed that this perception had a greater effect when respondents’ identification with the PSO was low. The finding also indicated that a message describing a PSO's donation of a large amount of money for a cause could create positive attitudes toward the PSO. These findings extend recent work on professional sport philanthropy by demonstrating that—under certain conditions—such an activity can enhance benefits for both PSOs and their nonprofit partners.     

Cognitive predictors of literacy acquisition in syllabic Hiragana and morphographic Kanji

We examined the role of different cognitive skills in word reading (accuracy and fluency) and spelling accuracy in syllabic Hiragana and morphographic Kanji. Japanese Hiragana and Kanji are strikingly contrastive orthographies: Hiragana has consistent character-sound correspondences with a limited symbol set, whereas Kanji has inconsistent character-sound correspondences with a large symbol set. One hundred sixty-nine Japanese children were assessed at the beginning of grade 1 on reading accuracy and fluency, spelling, phonological awareness, phonological memory, rapid automatized naming (RAN), orthographic knowledge, and morphological awareness, and on reading and spelling at the middle of grade 1. The results showed remarkable differences in the cognitive predictors of early reading accuracy and spelling development in Hiragana and Kanji, and somewhat lesser differences in the predictors of fluency development. Phonological awareness was a unique predictor of Hiragana reading accuracy and spelling, but its impact was relatively weak and transient. This finding is in line with those reported in consistent orthographies with contained symbol sets such as Finnish and Greek. In contrast, RAN and morphological awareness were more important predictors of Kanji than of Hiragana, and the patterns of relationships for Kanji were similar to those found in inconsistent orthographies with extensive symbol sets such as Chinese. The findings suggested that Japanese children learning two contrastive orthographic systems develop partially separate cognitive bases rather than a single basis for literacy acquisition.     

Community-based assessment pedagogy

This article attempts to structure student assessment practices in the classroom. Informed by fourth generation evaluation, it discusses a pedagogy based on a recursive framework of writing, assessment, and reflection activities that move students toward productive praxis. Implemented over three semesters at a land grant university in the U.S., this pedagogy moves away from teacher-centered assessment and evaluation of student writing, and pushes students to do these things for themselves. It promotes a classroom in which students take control of all writing assignments, their instructions, assessment criteria, and the practices and reflective activities that go along with their writing. It encourages a community of writers that are implicated in each others’ writing and assessment practices, and gets them to critically engage with these practices. The article offers theoretical justifications and qualitative data from three semesters and suggests conclusions based on them.     

Cognitive predictors of word reading in Sinhala

We examined whether akshara knowledge, phonological awareness, phonological memory, and RAN predict variability in word and nonword reading skills in Grade 1–4 children (N?=?200) learning to read Sinhala. Hierarchical regression analyses showed that akshara knowledge had the strongest unique association with both word and nonword reading accuracy across grades. Akshara knowledge and RAN predicted word and nonword reading fluency. The impact of phonological memory and syllable awareness on reading was mostly mediated by akshara knowledge, and phoneme awareness was not uniquely associated with word reading skills in any grade. These results suggest that there are multiple cognitive correlates of accurate and fluent word reading in Sinhala, and akshara knowledge is the most important predictor of learning to read words. The findings have implications for the literacy acquisition, development, and instruction in alphasyllabaries.

     

Long-term impact of the Tokyo 1964 Olympic Games on sport participation: A cohort analysis

The sport participation rate has been shown to decrease with age in many countries. In Japan, however, the elderly sport participation rate has increased over the last decade and is the highest among all Japanese. This study investigated whether the cohort effect generated by the shared experience of hosting the Tokyo 1964 Olympic Games during their youth can explain the increased sport participation of elderly Japanese. Data from the Japanese National Sport-Life Survey over 20 years were analyzed through regression analysis. The results show that, after controlling for demographics and other determinants of sport participation, individuals who experienced the Tokyo 1964 Olympic Games participated in sport more frequently than other generations.     

Instruction Matters to the Development of Phoneme Awareness and Its Relationship to Akshara Knowledge and Word Reading: Evidence from Sinhala

We examined whether global instruction of complex akshara and explicit phoneme-level instruction of akshara impact the development of phoneme awareness and its association with akshara knowledge and word reading accuracy. The participants were 100 Sinhala-speaking children from Grades 4 and 5 in Sri Lanka. Phoneme awareness showed stronger growth and a significant relationship with word reading accuracy and akshara knowledge only after children received explicit phoneme-level instruction in akshara construction. Both word reading accuracy and akshara knowledge predicted phoneme awareness, but the opposite was not true. The results suggest that phoneme awareness in Sinhala is sensitive to the method of reading instruction, and contrary to the studies in alphabetic languages, it does not have a bidirectional relationship with reading.     

CD4+单核细胞中HIV-1 gp120与gp160质粒的构建与表达

采用ＰＳＭＴＥ７作为质粒,进行ＨＩＶ－１ｅｎｖ基因对ＣＤ４阳性单核细胞Ｕ９３７－２的导入与表达,ｅｎｖ基因导入细胞在微量重金属镉的诱导下,激活妄动子表达ｇｐ１２０及ｇｐ１６０经Ｗｅｓｔｅｒｎｂｌｏｔ转移显色后,可得清晰的ｅｎｖ目的的条带,此外,充式细胞仪对表达的ｇｐ１２０与ＣＤ４位点的结合作了分析,验证了该表达蛋白的结构与活性,从实验系可以观察到的表达ｇｐ１６０的ＣＤ４细胞株由于表达ｇｐ１６０而引     

Does installation of the backstroke start device reduce 15-m start time in swimming?

The purpose of this study was to determine the installation of the backstroke start device reduces 15-m time. Thirteen college swimmers participated in this study. The aerial start and underwater motions were recorded with two digital video cameras. The center of mass (CM) of the swimmer, angular displacements and velocities of the shoulder, hip and knee joints were calculated. As an indicator of performance, the 5- and 15-m times were measured. The 5- and 15-m times in the backstroke start device condition were significantly shorter than in the non-backstroke start device condition. The vertical velocities of the CM at hand-off and toe-off in the backstroke start device condition were significantly greater than in the non-backstroke start device condition, while there was no significant difference in the CM horizontal velocity at toe-off. As a result, the height of the great trochanter at entry of the fingertips, with the backstroke start device, was 15 cm higher than in the non-backstroke start device condition. In addition, the CM horizontal velocities at 5 m in the backstroke start device condition were significantly greater than those of the non-backstroke start device. Thus, the use of the backstroke start device may reduce the 15-m time by diminution of the entry area.     

Cocco's musical intervention in the US base problems: traversing a realm of everyday cultural sensibilities in Okinawa

This essay intervenes in the political contradiction between the pro-base and anti-base positions in Okinawa while at the same time seeking to provide an alternative to the binary at the level of everyday cultural sensibilities. I will accomplish this task by exploring the activities of charismatic Okinawan musician-artist-activist Cocco. More specifically, locating Cocco's music within – and also outside – a long, complicated genealogy of Okinawan popular music, I will trace how she has grounded the formal political problems of the US military in Okinawa's everyday dilemmas concerning money, memory, and globalization. In my view, Cocco has done so in a way that prods us to move beyond the pro-base/anti-base binary and to navigate an uncharted realm of culture, power, and history. I will also pay attention to how the audience in Okinawa and beyond, as a co-producer of Cocco's music community, has participated in this process. In so doing, I will show how Cocco's music has brought to light possibilities of transforming the existing political inequalities from below, possibilities that may be destined to disappear as soon as they are materialized as an explicit political program. I will articulate these possibilities with reference to what French writer-critic-philosopher Maurice Blanchot (1908–2003) once called the ‘unavowable community’.