The purpose of this study was to examine the effect of a 12-week resistance training programme on fat-free mass (FFM), muscle cross-sectional area, muscular strength and muscle quality in women who underwent Roux-en-Y gastric bypass surgery. Participants were 16 women (mean age = 44.9 ± 10.2 years) from bariatric surgical groups who were randomly assigned into either a control or an intervention group. Air displacement plethysmography measured FFM and magnetic resonance imaging measured quadriceps muscle cross-sectional area and whole thigh muscle cross-sectional area. Muscular strength and quality was assessed using an estimated 1-Repetition Maximum assessment. All measurements were collected twice, at baseline and at a 12-week follow-up. There were significantly greater improvements in leg press strength (mean differences = 55.4%, P < 0.001, Cohen’s d = 2.4), leg extension strength (mean differences = 18.0%, P = 0.014, Cohen’s d = 0.86) and leg press muscle quality (mean differences = 54.5%, P < 0.001, Cohen’s d = 1.9) in the intervention group compared to the control group following the resistance training programme. The resistance training intervention significantly improved muscular strength and quality; however, it did not illicit changes in FFM or muscle cross-sectional area in women who underwent Roux-en-Y gastric bypass surgery. 相似文献
Abstract The purpose of this study was to determine test–retest reliability for the 1-mile, 3/4-mile, and 1/2-mile distance run/walk tests for children in Grades K—4. Fifty-one intact physical education classes were randomly assigned to one of the three distance run conditions. A total of 1,229 (621 boys, 608 girls) complied the test–retests in the fall (October), with 1,050 of these students (543 boys, 507 girls) repeating the tests in the spring (May). Results indicated that the 1-mile run/walk distance, as recommended for young children in most national test batteries, has acceptable intraclass reliability (.83 < R < .90) for both boys and girls in Grades 3 and 4, has minimal (fall) to acceptable (spring) reliability for Grade 2 students (.70 < R < .83), but is not reliable for children in Grades K and 1 (.34 < R < .56). The 1/2 mile was the only distance meeting minimal reliability standards for boys and girls in Grades K and 1 (.73 < R < .82). Results also indicated that reliability estimates remained fairly stable across gender and age groups from the fall to spring testing periods, with the exception of the noticeably improved values for Grade 2 students on the 1-mile run/walk test. Criterion-referenced reliability (P, percent agreement) was also estimated relative to Physical Best and Fitnessgram run/walk standards. Reliability coefficients for all age group standards were acceptable to high (.70 < P < .95), except for Fitnessgram standards for 5-year-old girls on the 1-mile test for both fall and spring and for 6-year-old boys and girls on the 1-mile test administered in the spring. 相似文献
This study examined the strength of tracking sport participation from childhood to early adulthood among the Dunedin Multidisciplinary Health and Development Study cohort. Participation in sport, dance, or gymnastics as part of a club or group (outside of school) was assessed at ages 7, 9, 15, 18, and 21 years. In addition to the traditionally used correlation coefficients, summary statistics (intraclass correlations; ICC) from random effect models and stability coefficients from generalized estimating equations (GEE) were calculated using all the longitudinal data and controlling for the influence of covariates on tracking strength. Correlation coefficients revealed statistically significant tracking of club sport participation (7–21 years) at low levels (r = .07–0.28). The ICC summary statistic (0.23) was consistent with this, while the GEE suggested moderate tracking (0.59). The results of this study suggest that encouraging sport participation during childhood and adolescence may result in a modest increase in the likelihood of participation later in life. However, the substantial movement into and out of sport participation observed here and in other studies cautions against relying solely on sport promotion among youth as a strategy to promote lifelong participation. 相似文献
First, where we have been regarding measurement research will be discussed since the type, quality, and quantity of measurement research conducted in the past influences the type of measurement research which is presently conducted. Second, where we are now regarding measurement research will be discussed since the type of measurement research presently being conducted will influence the type of research which will be conducted in the future. Certainly the present status of, trends in, and needed measurement research should be identified to guide measurement researchers in deciding what measurement research to conduct. Third, where we are going regarding to measurement research will be discussed. 相似文献
An articulated boot design is commonly used in skiing and skating sports because it allows sagittal plane ankle mobility while still providing critical frontal plane stability. Although articulated boots have been in use for several decades, current manufacturers of these boots differ in their articulation placement. In this study we determined an optimal position of the ankle articulation axis. We also calculated the amount of anterior skin movement that a boot tongue must account for during a full range of ankle motion. Three‐dimensional kinematic data were collected and analyzed from 40 participants moving their right foot through a full range of sagittal plane motion. The calculated horizontal position of the articulation axis was found to be highly predictable from foot length (r = 0.87, standard error of estimate = 3.44 mm), while its vertical component displayed less predictability (r = 0.49, standard error of estimate = 7.46 mm). The expansion required by the boot tongue had a moderate association with foot length and low variability (r = 0.58, standard error of estimate = 0.07 mm). An accurate axis placement will minimize relative motion between the boot cuff and the ankle, reducing friction and motion resistance. An expandable tongue will accommodate full plantar flexion and reduce pressure on the anterior ankle during dorsiflexion, eliminating common pressure‐related injuries.相似文献
Two preliminary studies explored the use of a self‐management strategy as a component of a training program for residential Child and Family Workers. The self‐management strategy comprised the Correspondence Training procedures of Risley (1977) and the formulation of specific implementation plans (Sanders & Glynn, 1981). Experiment 1 found that prompting staff to formulate plans of how they would implement target behaviour management skills and providing individual feedback on their performance in accordance with their plans resulted in gains in implementation of target skills; no gains in implementation resulted from Instruction and Group Feedback conditions alone. This experiment examined pooled data from 18 staff collected by regular time sampled observations. Experiment 2 introduced similar procedures in a multiple baseline design to four volunteer staff, each of whom selected two target behavioural skills from the training manual. The self‐management strategy resulted in clear gains in implementation of these self‐selected target skills by all four staff. Results are discussed in terms of the potential of the correspondence training paradigm and the formulation of specific implementation plans as an approach to on‐the‐job training of residential staff. 相似文献
Subjects were five Cambodian mother‐child pairs. Three mothers (Group One) had received one year's schooling, and two (Group Two) had had no schooling in Cambodia; all children were participating in regular primary school class reading programs and receiving individual help from an ESL teacher. Group One was introduced to Shared Reading in a multiple baseline across‐subjects design, while an AB design was used for Group Two. Probes were taken of mothers and children reading individually from unseen books at the same level as those used in Shared Reading. During the Shared Reading program the Group One mothers and children markedly increased their rate of progress through book levels as did the Group Two children, but the Group Two mothers did not, although there was some evidence of minor progress in word recognition. Results are discussed in terms of the importance of the interactive social context for acquiring literacy skills. 相似文献
One major world view that dominates the field of developmental psychology is the organismic world view. This world view depicts individuals, including children, as active agents who know the world in terms of their own operations upon it. Individuals are seen as being in control of their own learning. This control is exercised by individuals initiating and maintaining their own learning opportunities within a responsive social context.
The responsive social context is increasingly seen by developmental psychologists (Bronfenbrenner, 1979; Wood, 1982) as of fundamental importance for the acquisition of intellectual skills. It is within responsive social contexts that individuals acquire not only specific skills but also generic knowledge about how to learn. It is this generic knowledge that allows individuals a measure of control over, and hence independence in, these social contexts.
Educational policy statements, school prospectuses and, more recently, the Core Curriculum, abound with aims and objectives to do with achieving individual autonomy and independence as a learner. Yet there is growing evidence that in many contemporary classrooms at primary, secondary and tertiary levels, we may be providing precisely the wrong contexts for students to become autonomous and independent learners. Too many classroom learning environments simply do not qualify as responsive social contexts. Individual learners have minimal control over learning interactions and hence are excessively dependent on external control by teachers.
Theoretical explanations for differences between unskilled and skilled performance are being sought increasingly in terms of characteristics of the specific contexts in which performance occurs and less in terms of qualitative differences in global capacities or in thinking processes between individuals (Wood, 1982). For example, differences in complexity of oral language between three‐year‐old children might be explained by differences in the amount and quality of language exchange with caregivers. They might also be explained by differences in caregiver skills in interpreting and responding to needs signalled by an individual child's use of language in a particular context. If we are genuinely concerned about aims of autonomy and independence in learning, then we need to discover and analyse those characteristics of responsive environments which support and promote independent learning. On the basis of existing research it is possible to specify four such characteristics of responsive learning contexts.