The purpose of this study was to identify the characteristics of lower extremity joint kinetics during quick-catch motion in clean exercise using a weight training method. Eleven male track-and-field athletes performed power clean with loads of 30%, 60% and 90% of 1RM. Kinematics and kinetic data were collected from data recorded using a Vicon motion system (250 Hz) and force platforms (1,000 Hz). The characteristics of lower extremity joint kinetics during quick-catch motion were as follows:
1) The elapsed time during quick-catch motion was shorter than during normal catch motion, and the force developed was larger.
2) Kinetics in the ankle and knee joints during quick-catch motion was larger than during normal catch motion.
3) The knee joint angle was smaller during quick-catch motion than the change in knee joint angle during normal catch motion.
This knowledge is of value when using catch motion in clean exercise as a training method.
This study aimed to elucidate the relationship between continuity of nurses’ job and practice of dementia care at long-term care health facilities (L-HFs). A questionnaire survey was conducted with five nurses each from 255 facilities in four prefectures of the Tokai region. A total of 384 responses (30.1%) were analyzed using a covariance structure analysis, the Nursing version of the Duty Satisfaction Rating Scale for L-HFs, and the Support Standards for the Behavioral and Psychological Symptoms of Dementia (BPSD). The following results were obtained: (1) “wages” were related to overall job satisfaction, intention to change the workplace, and intention to resign; (2) regarding nurses’ fidelity to the assumed model, the goodness of fit index (GFI) was .922, the adjusted goodness of fit index (AGFI) was .887, the comparative fit index (CFI) was .934, and the root mean square error of approximation (RMSEA) was .076; GFI ≥ AGFI. Subsequently, the categories of “care for elderly people with BPSD,” “nurses’ job satisfaction at L-HFs,” and “continuity of nurses’ job” were extracted. These findings suggest that, for nurses to continue their job, it is important to cultivate their ability to cope with the elderly with BPSD.
This study examines the relation between baseball skills of school children who are baseball players and their ability to accomplish Complicated Movement Tasks (CMT). The participants were 297 children baseball players with baseball history over one year (3rd grade in elementary school: 69 students, 4th grade: 90 students, 5th grade: 76 students, and 6th grade: 62 students). Using CMT test comprising 3 items and coach’s subjective evaluation questionnaire, CMT accomplishment ability and baseball skills were evaluated and the relation between them was examined. As a result of examining the relation between the total score of CMT and the total score of baseball skills, the relation of both was recognized in all of 3rd-6th graders. Significant relation was observed between the CMT accomplishment ability and the batting ability in the 3rd and 4th graders. However, the batting abilities of 5th and 6th graders were not related to the CMT accomplishment ability. Significant relation was observed between the CMT accomplishment ability and the defense abilities in all of 3rd-6th graders. The relation between the CMT accomplishment ability and base running abilities was recognized in all graders. In conclusion, although the CMT accomplishment ability and baseball skills are related, the magnitude of the relation differed by the evaluation item.
The purpose of this study was to examine the effects of Kung Fu gymnastics on physical fitness of middle-aged and older people. Twenty-seven persons aged 50 to 70 participating in this study joined a health promotion class. The subjects were divided into Kung Fu gymnastics (Kung Fu group, n=16) or racket sports (racket sports group, n=11) by their choice. The Kung Fu group performed a program of Kung Fu gymnastics, while the racket sports group performed racket sports, twice a week for 6 weeks. Before and after 6-week intervention, grip strength, back muscle strength, standing broad jump, single leg squat, modified sit-and-reach, one-legged stand with eyes closed and body sway were measured. There were significant and favorable changes in back muscle strength, standing broad jump, single leg squat, modified sit-and-reach, lateral sway of central position, and one-legged stand on the left leg with eyes closed during the intervention. However, two-way repeated-measure ANOVA revealed significant interaction in the one-legged stand on the left leg with eyes closed, with no significant interactions in the others. It is suggested that both Kung Fu gymnastics and racket sports for 6 weeks can improve the muscle strength of the trunk and lower extremity and the flexibility of the trunk.
In this study, we examined the relationship between running speed, step frequency and length in the acceleration and maximum speed phases in young children’s 25 m and adults’ 50 m sprint. The subjects were 21 younger boys (4.8 ± 0.2 years), 22 elder boys (5.8 ± 0.3 years) and 20 healthy male adults (21.2 ± 1.2 years). In the young children’s 25 m and adult’s 50 m sprint, the sections 0 to 15 m and 0 to 30 m, respectively, were defined as the acceleration phase of, and 15 to 25 and 30 to 50 m, respectively, as the maximum speed phase to examine the time (seconds), step frequency (step/second) and length (m/step) in the two phases. Result showed that the running speed and step length of elder boys were significantly larger than those of younger boys, without significant differences in step frequency between the two groups (p<0.05). In all groups, the running speed and step length in the maximum speed phase were significantly larger than those in the acceleration phase, and the step frequency was significantly smaller (p <0.05). The young children’s height showed moderate correlation (r = 0.514 〜 0.608) with the running speed and step length in the two phases, but no correlation with the step frequency was found. There was a strong positive correlation (r = 0.606 〜 0.862) between the running speed and step length in all groups, but no correlation was found between the running speed and step frequency. From these results it was concluded that, like for adults, the faster the running speed in acceleration phase in young childhood, the higher the running speed in the maximum speed phase and, furthermore, the running speeds of young children in the acceleration and maximum speed phases are determined by the increase in step length accompanying the increase in height.