Agreement between bioelectrical impedance and dual energy X-ray absorptiometry in assessing fat,lean and bone mass changes in adults after a lifestyle intervention

We aimed to assess the agreement of a commercially available bioelectrical impedance analysis (BIA) device in measuring changes in fat, lean and bone mass over a 10-week lifestyle intervention, with dual energy X-ray absorptiometry (DXA) as reference. A sample of 136 volunteers (18–66 years) underwent a physical activity intervention to enhance lean mass and reduce fat mass. BIA (Tanita BC545) and DXA (Hologic Explorer) measures of whole-body composition were taken at baseline and at the end of the intervention. After an average of 74 ± 18 days intervention, DXA showed significant changes in 2 of 3 outcome variables: reduced fat mass of 0.802 ± 1.092 kg (P < 0.001), increased lean mass of 0.477 ± 0.966 kg (P < 0.001); minor non-significant increase of 0.007 ± 0.041 kg of bone mass (P = 0.052). The respective changes in BIA measures were a significant reduction of 0.486 ± 1.539 kg fat (P < 0.001), but non-significant increases of 0.084 ± 1.201 kg lean mass (P = 0.425), and 0.014 ± 0.091 kg bone (P = 0.074). Significant, but moderately weak, correlations were seen in absolute mass changes between DXA and BIA: 0.511 (fat), 0.362 (lean) and 0.172 (bone). Compared to DXA, BIA demonstrated mediocre agreement to changes in fat mass, but poor agreement to lean mass changes. BIA significantly underestimated the magnitude of changes in fat and lean mass compared to DXA.     

Modest modifications and structural stability: higher education in Ontario

Policy change in Ontario higher education in the 1960s resulted in a series of structures designed to co-ordinate each of the two sectors in this binary system. Recent government initiatives may be characterized as attempts to initiate or stimulate change within the boundaries and constraints associated with a structure which has been relatively stable for twenty years. There has been some increase in regulation in the university sector through the establishment of targeted funding mechanisms, programme appraisal and approval mechanisms, and the government's legislated monopoly over degree-granting, but these changes have had little impact on the basic operations of the universities. Government initiatives in the community college sector have had some impact in terms of greater institutional differentiation, but little impact on institution stratification. The stability of the Ontario system can be attributed to the relative homogeneity of each of two clearly differentiated sectors, the limited role of the federal government in the policy arena, a structure which has deflected or rejected calls for structural change, and the failure of those who seek change to stimulate a public or political debate on higher education policy.     

Computer Experience,School Support and Computer Anxieties

Past research has shown computer anxiety to be present in a sizeable minority of school teachers, and has identified some of the personal and school‐based correlates of this anxiety. Before effective interventions can be introduced, however, more needs to be known of the various forms and sources of this problem. The current study involved a survey of the experiences, attitudes and anxieties of a random sample of 350 Australian primary and secondary school teachers. Levels of self‐rated computing competence among these teachers were moderately low. Computing competence and anxiety were highly correlated, r= ‐ 0.78. Three distinctive types of computer anxiety were identified, as was a set of factors predictive of each. As hypothesised, computer anxieties were inversely related to the quality of prior computer learning experiences, and to the extent of current school support for computer usage. Implications for the reduction of computer anxiety among teachers are discussed.     

The prevalence of child sexual abuse victimization in an adult sample of Texas residents

Attempts to identify characteristics of children who have been sexually abused have generally been based on cases reported to clinics, hospitals, law enforcement and social service agencies. In this study a questionnaire was mailed to a representative sample of the adult population in Texas. Child sexual abuse was defined as sexual interaction between a child and an adult or between two minors when the perpetrator is significantly older than the victim or is in a position of power over the victim. A return rate of 53% was obtained. The surveys returned varied from previous studies of the same population in that the respondents were slightly older, more often married and from a slightly higher socioeconomic level. They were, however, closely matched on the variables of sex, race and educational level. Childhood sexual victimization was reported by 7.4% of the respondents. Female victims comprised 82% of this group. The racial/ethnic distribution of victims paralleled that of the Texas census with 77% white, 5% black, and 16% Hispanic. Victimization rates were highest for Hispanic females followed by black and white females in that order. Hispanic and black males reported the lowest victimization rates. Based on these findings, it was estimated that 821,359 adult Texas residents were sexually abused as children. These results were compared with those of other studies along with their implications for policy-making.     

Cluster score performance of learning disabled students on the Woodcock-Johnson psycho-educational battery

Research suggests that the Woodcock-Johnson may be ineffective in its ability to identify learning disabled students, to depict their aptitude accurately, and to highlight processing strengths and deficits. Seventy-one previously identified learning disabled students were given the WJPEB, and their cluster score performance was evaluated. Using three different methods of obtaining discrepancies, only slightly more than half of the LD students were identified. Memory deficits were apparent. Support is given for cautious use of the WJPEB in LD diagnosis.     

Biceps femoris long head sarcomere and fascicle length adaptations after 3 weeks of eccentric exercise training

Background:Eccentric exercise increases muscle fascicle lengths;however,the mechanisms behind this adaptation are still unknown.This study aimed to determine whether biceps femoris long head(BFlh)fascicle length increases in response to 3 weeks of eccentric exercise training are the result of an in-series addition of sarcomeres within the muscle fibers.Methods:Ten recreationally active participants(age=27±3 years;mass=70±14 kg;height=174±9 cm;mean±SD)completed 3 weeks of Nordic hamstring exercise(NHE)training on a custom exercise device that was instrumented with load cells.We collected in vivo sarcomere and muscle fascicle images of the BFlh in 2 regions(central and distal)by using microendoscopy and 3 dimension ultrasonography.We then estimated sarcomere length,sarcomere number,and fascicle length before and after the training intervention.Results:Eccentric knee flexion strength increased after the training(15%;p<0.001;η_p²=0.75).Further,we found a significant increase in fascicle length(21%;p<0.001;η_p²=0.81)and sarcomere length(17%;p<0.001;ηp2=0.90)in the distal but not in the central portion of the muscle.The estimated number of sarcomeres in series did not change in either region.Conclusion:Fascicle length adaptations appear to be heterogeneous in the BFlh in response to 3 weeks of NHE training.An increase in sarcomere length,rather than the addition of sarcomeres in series,appears to underlie increases in fascicle length in the distal region of the BFlh.The mechanism driving regional increases in fascicle and sarcomere length remains unknown,but we speculate that it may be driven by regional changes in the pas sive tension of muscle or connective tis sue adaptations.     

Using Multimedia to Introduce Young People to Public Art in Glasgow

This paper is based on a presentation at the NSEAD/AAIAD Millennium Conference in Bristol, April 2000 and takes as its focus a recent multimedia publication, a CD-ROM, commissioned by Glasgow 1999, entitled ‘Scanning the City’. The commission was to find effective ways that students in schools could interrogate the diverse urban fabric of Glasgow. The electronic revolution has shifted the paradigms of teaching and learning by creating the opportunity to engage interactively with visual and textual data in ways that permit investigation of the built environments at a number of levels of intensity. The paper explains the background to the CD-ROM, describes the design, content and theoretical underpinning of ‘Scanning the City’ and discusses ways it might be used in a variety of educational contexts. It concludes by looking forward to the next stages of the research including a study of how young people and teachers are using the CD-ROM and other related multimedia publications.