Instruction in reliability and magnitude of evaluation parameters at each phase of a sit-to-stand movement

The sit-to-stand movement strategy of each subject is different depending on whether the subjects perform voluntary movements or have concrete instructions (i.e., stand quickly), which is strongly reflected in the performance of each sit-to-stand movement phase. Thirty young-adult male subjects participated in this study (M age=20.7 yr; SD=2.6). Subjects performed the two movements from a chair height adjusted to the subject's lower thigh length. In the self-administered (SA) condition, subjects voluntarily stood up from the chair without instruction, and in the assigned-ordered (AO) condition subjects stood up from the chair as fast as possible. Vertical floor reaction force and electromyograms of the rectus femoris and tibialis anterior muscles were measured, and 15 parameters were selected. The parameters in the phase between the peak value of the floor reaction force and completion of the movement was highly reliable regardless of instruction. However, other parameters had different reliabilities between the instruction conditions. In particular, the parameters in the phase between starting the movement and the peak value of the floor reaction force under the assigned-order were higher than those of the self-administered condition. Moreover, the sit-to-stand movement was conducted faster in the assigned-order condition during the phase between starting the movement and buttocks-syneresis, and the peak value of the floor reaction force and completion of the movement. From the above, in the assigned-order condition "as fast as possible," the anteflexion bending movement and extension of knee and trunk joints were faster, and anteflexion movement was repeated more similarly under a concrete instruction such as moving as fast as possible.     

Influence of differences of visual acuity in various visual field conditions on spectral characteristics of the center of pressure sway

This study examined the influence of visual acuity and visual field on the spectral characteristics of the center of pressure during standing. 17 men and 20 women participated in High and Low visual acuity groups. Both groups underwent center of pressure measurements under three visual field conditions: No vision: subjects were given no visual information, Central vision: they were given only central visual field information, and Full vision: they were given full visual information. To assess the spectral characteristics of center of pressure, mean power frequency and frequency of maximal power were calculated from medial-lateral and anterior-posterior center of pressure directions. The Friedman test and Scheffé pairwise comparison tests showed that frequency of maximal power was higher in the No vision than in the Central and Full vision conditions in the High visual acuity group. In conclusion, people with high visual acuity are more susceptible to visual field conditions than those with low visual acuity. It is suggested that postural control characteristics differ with visual acuity or resolution in the central visual field.     

Sensory Processing Sensitivity Moderates the Relationships Between Life Skills and Depressive Tendencies in University Students1

University students often experience depressive symptoms, and strengthening of life skills may be beneficial for improving their mental health. Several studies have suggested that life skills effective in reducing depressive tendencies vary by individuals depending on differences in sensory processing sensitivity (SPS). SPS is a genetically determined trait characterized by sensitivity and reactivity to environmental stimuli. This study investigated the relationship between life skills and depressive tendencies based on individual differences in SPS. A total of 868 Japanese university students (mean age = 19.8 years, SD = 1.3 years) completed a questionnaire measuring levels of SPS—decision-making, interpersonal relationships, effective communication, and emotional coping skills—and depressive tendencies. Hierarchical multiple regression and simple slopes analyses indicated that interpersonal relationship skills were negatively correlated with depression regardless of SPS levels. Furthermore, decision-making skills were negatively correlated with depressive tendencies only in low-SPS students. Emotional coping skills were negatively correlated with depressive tendencies in high-SPS students. These results may help universities incorporate SPS levels when creating life-skills-based interventions for students.     

Casual Cynics or Disillusioned Democrats? Political Alienation in Japan

This paper examines the structure of political alienation among Japanese eligible voters, using data from the first, second, fifth, and sixth waves of the seven-wave Japanese Electoral Survey II (JES II). Political alienation can be expressed as comprising two dimensions, political trust and civic-mindedness. Males and people with more years of schooling are more allegiant in general; that is, they are both more trusting and more civic-minded. Evaluations of cabinet performance and support for democratic mechanisms are strongly related to political trust and civic-mindedness. Supporters of the Liberal Democratic Party (LDP) are no more civic-minded than average but are more trusting politically, whereas Japan Communist Party supporters are more civic-minded but a good deal less politically trusting than average. Independents are below the overall average on both the political trust and civic-mindedness dimensions. Even though party support is unstable, Japan's political system will not lose its stability as long as LDP supporters and independents constitute the majority of Japan's electorate. The advent of a new party capable of providing an alternative to the LDP is important to the future of Japanese democracy.     

Height of chair seat and movement characteristics in sit-to-stand by young and elderly adults

The height of a chair seat affects the burden on the lower limbs during the sit-to-stand (STS). To develop an objective test to evaluate muscle function of the lower limbs using floor reaction force during a STS, the relationship between chair-seat height and the burden on the lower legs must be assessed. To examine the influence of the chair-seat height, floor reaction forces during a STS performed with 5 chair heights adjusted to each subject's lower leg length were compared. The force production and quickness of movement tended to decrease in the phases of trunk flexion and knee and hip joint extension when performing a STS from a lower chair, when the chair height differed by 20% (6.2 cm) from the lower leg length, and was marked when the difference between chair height and lower leg length became larger. In 52 elderly and 50 young adults, floor reaction forces during a STS performed from a chair of the same height as subjects' lower leg lengths were compared. Elderly persons were inferior in force production (strength) and quickness of movement, which decreased as elderly stood up from a chair of a lower height.     

Nitroglycerin relieves emotional stress-induced stomach ulcers in rats

It is known that nitroglycerin (GTN) can be converted to form a nitric oxide (NO) molecule which is a highly reactive and unstable free radical species. NO is known to have many beneficial effects such as relaxing blood vessels, promoting digestive activity, and regulating blood pressure. The first experiment established an additional effect of NO, that GTN can help prevent emotionally-induced stomach stress ulcers in rats. In Experiment 2, we sought to estimate the quantity of nitrogen oxides in serum produced by GTN that is administered subcutaneously to rats. The results indicated that rats administered GTN increased significantly the amount of serum NO₂ and NO₃, relative to values for a control group. Since amounts of NO₂ and NO₃ reflect amount of NO, the administration of GTN significantly increased amount of NO. An implication of this research is that chemicals such as GTN may be used in therapy with humans for the prevention of some kinds of ulcers. Furthermore, while NO is commonly recognized as a pollutant, it has a number of beneficial effects on the body, e. g., it may slow the aging process, contribute to therapy for improtency, and facilitate memory processes.