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101.
A comparison of the mechanical effect of arm swing and countermovement on the lower extremities in vertical jumping 总被引:1,自引:0,他引:1
The purposes of this study were to quantify and compare how arm swing and countermovement affect lower extremity torque and work during vertical jumping and to gain insight into the mechanisms that enable the arm swing and countermovement to increase jump height. Five participants maximally performed two types of vertical squat jumps with (SJA) and without (SJ) an arm swing and two types of countermovement vertical jumps with (CJA) and without (CJ) an arm swing. The participants jumped from a force platform and all performances were videotaped with a high-speed video camera (200Hz). Jump heights, joint torques and work were calculated by combining kinematic and kinetic data. It was found that of the four jumping conditions, the participants jumped highest when they used an arm swing with countermovement (i.e., CJA). The increase of the countermovement jump height with an arm swing is the result of the increase of the lower extremity work. In the hip joint, the increase in torque caused by the countermovement predominantly occurred at the beginning of the propulsion phase, while the increase in torque caused by the arm swing occurred in the rest of the propulsion phase. A key finding of our study is that arm swing and countermovement have independent effects on lower extremity work, and their effects are additive in CJA to produce greater jump height. 相似文献
102.
Experiment 1 was conducted to determine if proportional transfer from "small to large" scale movements is as effective as transferring from "large to small." We hypothesize that the learning of larger scale movement will require the participant to learn to manage the generation, storage, and dissipation of forces better than when practicing smaller scale movements. Thus, we predict an advantage for transfer of larger scale movements to smaller scale movements relative to transfer from smaller to larger scale movements. Experiment 2 was conducted to determine if adding a load to a smaller scale movement would enhance later transfer to a larger scale movement sequence. It was hypothesized that the added load would require the participants to consider the dynamics of the movement to a greater extent than without the load. The results replicated earlier findings of effective transfer from large to small movements, but consistent with our hypothesis, transfer was less effective from small to large (Experiment 1). However, when a load was added during acquisition transfer from small to large was enhanced even though the load was removed during the transfer test. These results are consistent with the notion that the transfer asymmetry noted in Experiment 1 was due to factors related to movement dynamics that were enhanced during practice of the larger scale movement sequence, but not during the practice of the smaller scale movement sequence. The findings that the movement structure is unaffected by transfer direction but the movement dynamics are influenced by transfer direction is consistent with hierarchal models of sequence production. 相似文献
103.
Ethnic and gender subgroup differences in assessment center ratings: a meta-analysis 总被引:2,自引:0,他引:2
Assessment centers are widely believed to have relatively small standardized subgroup differences (d). However, no meta-analytic review to date has examined ds for assessment centers. The authors conducted a meta-analysis of available data and found an overall Black-White d of 0.52, an overall Hispanic-White d of 0.28, and an overall male-female d of -0.19. Consistent with our expectations, results suggest that Black-White ds in assessment center data may be larger than was previously thought. Hispanic-White comparisons were smaller than were Black-White comparisons. Females, on average, scored higher than did males in assessment centers. As such, assessment centers may be associated with more adverse impact against Blacks than is portrayed in the literature, but the predictor may have less adverse impact and be more "diversity friendly" for Hispanics and females. 相似文献
104.
Tanya Maines Brown M Douglas Ris Dean Beebe Robert T Ammerman Sonya G Oppenheimer Keith Owen Yeates Benedicta G Enrile 《Child neuropsychology》2008,14(2):118-134
This study examined differences between healthy children (n = 35) and those with spina bifida myelomeningocele (SBM; n = 42) on the Behavior Rating Inventory of Executive Function (BRIEF), a measure of executive function behaviors. It also examined whether aspects of biological risk associated with SBM and reserve factors within the family could account for variability in BRIEF scores for children and adolescents with SBM. Patients in the SBM group exhibited more problems than both published norms and a local comparison group of healthy children in metacognition but not behavior regulation. Behavior regulation problems in children with SBM were predicted by parent psychological distress. More shunt-related surgeries and history of seizures predicted poorer metacognitive abilities. 相似文献
105.
106.
Self-esteem is often lower among persons who have experienced trauma, but religiosity may ameliorate these psychological effects. The purpose of this paper was to examine the relationships among religiosity, self-esteem, and childhood exposure to trauma, utilizing data from the National Comorbidity Survey, a large (N = 8,098) nationally representative population survey in the 48 contiguous states of the USA that assessed religious practices, self-esteem, and exposure to trauma. Exposure to trauma in childhood was assessed through self-report of presence or absence of childhood physical abuse, sexual abuse, or neglect. Religiosity was assessed as the sum of responses to 4 self-report items (religious service attendance, use of religion for comfort and guidance, and importance of religion). Self-esteem was assessed on 9 self-report items adapted from the Rosenberg Self-Esteem Scale. Analysis of variance compared scores for persons who reported exposure to childhood abuse and differed in the value they placed on various religious practices on self-esteem. Persons who reported physical abuse, sexual abuse, or neglect in childhood had significantly lower mean self-esteem than those who did not report these events. There was also a main effect for religiosity in a comparison of persons who reported childhood sexual abuse with those who reported none. The High Religiosity group had higher mean self-esteem than the Medium and Low Religiosity groups. There was a significant interaction as those who reported childhood sexual abuse had lower mean self-esteem than peers who reported none in the Low and Medium Religiosity groups. Mean self-esteem for those who reported childhood sexual abuse was comparable to that of those who reported none in the High Religiosity group. 相似文献
107.
108.
Takashi Kusumi Kazuji Nishikawa Nobutake Nomura Jeffrey Dean Webster 《The Japanese psychological research》2024,66(1):14-27
A balanced time perspective (BTP) is defined as a frequent and equal tendency to think positively about both one's past and future. A BTP is related to greater psychological well-being, such as life satisfaction and wisdom, and these BTP associations may vary cross-culturally, although few studies of BTP in non-Western countries exist. In order to advance cross-cultural comparisons of BTP, an important methodological step is to validate BTP measures in different cultures. This study aimed to develop and validate a Japanese version of the modified Balanced Time Perspective Scale (mBTPS). Japanese participants (N = 1,020, aged 18–79 years) completed the mBTPS-J, along with Japanese versions of the Zimbardo Time Perspective Inventory (ZTPI-J) and measures of well-being (life satisfaction and wisdom scales). Factor analysis of the mBTPS-J resulted in a 27-item mBTPS-J consisting of Past, Present, and Future subscales. Correlations between the relevant mBTPS-J and ZTPI-J subscales, and with the well-being measures, supported both convergent and predictive validity, respectively. The demonstrated psychometric strengths of the mBTPS-J will allow for specific testing of important cross-cultural questions. 相似文献
109.
James Bennett‐Levy Shawn Wilson Jeff Nelson Janelle Stirling Kelleigh Ryan Darlene Rotumah Wayne Budden Dean Beale 《Australian psychologist》2014,49(1):1-7
The objective of the study was to investigate whether high and low intensity versions of cognitive behaviour therapy (CBT) might be an effective therapeutic approach for enhancing the mental health of Aboriginal Australians. Five university‐educated Aboriginal counsellors received in‐depth training in CBT. Over the following year, they used CBT strategies with their clients, and met 10 times as a participatory action research group. The group addressed three key questions: (a) Does CBT appear to be useful for Aboriginal Australians? (b) If so, what elements of CBT are perceived to be effective? (c) What adaptations might be made to CBT to enhance its effectiveness with Aboriginal Australians? The resulting qualitative data were transcribed and analysed. Counsellors perceived CBT to be very useful for their Aboriginal clients and for themselves. They reported that it enhanced their clients' well‐being, their own clinical skills, and their own well‐being, and it reduced burnout. The qualities of CBT that were perceived to be effective were its adaptability, pragmatic here‐and‐now approach, capacity for low‐intensity interventions, safe containing structure, promotion of self‐agency, and valuable techniques. It was suggested that the prime requirement for adaptations to CBT were that they would need to fit different social and cultural contexts. 相似文献
110.
Joel Epstein W. Dean Klinkenberg Donald J. Scandell Kelly Faulkner Ronald E. Claus 《Sex roles》2007,56(1-2):23-31
This study was designed to examine the influence a potential date’s physical attractiveness and sexual history has on an individual’s
intentions to engage in safer sex. Over 1,200 participants completed an Internet survey. The questionnaire presented a randomized
biography and photograph and asked participants to rate their interest in dating and having a sexual relationship with the
target. Participants were randomly assigned to one of six conditions based on the target’s physical attractiveness (low vs.
high) and sexual experience (low, medium, or high). Results indicated that men reported greater intentions to have sex than
women did, and all participants reported greater likelihood of having sex when the potential partner was highly attractive.
Participants rated men and more experienced targets as more risky sexual partners, and the level of a target’s sexual experience
was directly related to participants’ willingness to discuss sexual risks. Results indicate a continuing need to include discussion
of cognitive factors in all HIV prevention efforts. 相似文献