The validity of the commercially-available,low-cost,wrist-worn Movband accelerometer during treadmill exercise and free-living physical activity     

Jacob E. Barkley  Ellen Glickman  Curtis Fennell  Mallory Kobak  Megan Frank  Gregory Farnell 《Journal of sports sciences》2019,37(7):735-740

Low-cost physical activity monitors may provide a more accurate measure of physical activity than subjective methods (e.g., self-report) while being less costly than research-grade accelerometers. The present study assessed the validity of a low-cost monitor (Movband 2) to estimate physical activity behavior/intensity. Participants (N = 23, n = 16 female, BMI = 22.9 ± 4.0 kg/m², age = 21.9 ± 1.6 years) completed four, five-minute treadmill stages (2.0, 3.0, 4.0, 5.0 MPH) while wearing both the Movband and the previously-validated Actigraph monitor. Oxygen consumption (VO₂) was recorded during each stage (Laboratory assessment). A subset (n = 15, n = 10 female, BMI = 22.2 ± 3.2 kg/m², age = 21.5 ± 0.8 years) of these participants then wore the two accelerometers for three days (Free-living assessment). During the Laboratory assessment there were strong, significant (r = 0.94, p ≤ 0.001) relationships between Movband and Actigraph counts and VO₂. During Free-living assessment there was also a strong, significant (r = 0.97, p < 0.001) correlation between Movband and Actigraph counts. The low-cost, Movband accelerometer appears to provide a valid assessment of physical activity behavior/intensity.  相似文献   

All in the family?     

Megan M. Wood 《Journal of Cultural Economy》2018,11(1):83-88

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Collaborative learning: A memorable model     

Megan Tschannen‐Moran  Anita Woolfolk Hoy 《The Teacher Educator》2013,48(2):148-165

Abstract

Reform movements envision schools that will involve greater levels of cooperation and collaboration. Collaborative learning strategies provide a powerful mechanism not only to address affective goals in education but also to enhance students’ cognitive development; to deepen their understanding of concepts; and to press them to examine, articulate, and elaborate their ideas with greater clarity and rigor. Unless teachers have effective means to manage the complex problem solving involved in implementing collaborative learning strategies, the rich possibilities offered will not be realized. This paper proposes a five‐part conceptual framework to guide teachers decision making in order to capitalize on these powerful strategies. The framework incorporates a “G” mnemonic to make the elements memorable.  相似文献   

Photographic reportage and the colonial imaginary     

Megan Ponsford 《Sport in Society》2019,22(1):160-184

Abstract

This article critiques the first Australian cricket tour of India in 1935/36 through a synthesis of history, theory and imagery, and argues that the photographic content provides invaluable and historically overlooked insight into the cricketers’ perspective. Employing this methodology is unorthodox in sports writing and is innovative in application. The photographs provide a rare and previously unobtainable glimpse into the everyday cultural life and practice of the tour, and deliver a subjective representation of the cricketers’ experience. The significance of the images is twofold: they function as proof to verify the Australians presence in India and they assist a cultural critique of the tour. The images reveal that the cricketers’ response to the colonial paradigm was multifaceted and hallmarked by ambiguity. Despite at times adhering to their anticipated civiliving and educating role as white touring cricketers, the Australian team also challenged colonial protocols and simultaneously demonstrated support for the nationalistic sentiments brewing in 1930s India.  相似文献   

The impact of chronic carbohydrate manipulation on mucosal immunity in elite endurance athletes     

Alannah K. A. McKay  David B. Pyne  Peter Peeling  Avish P. Sharma  Megan L.R. Ross  Louise M. Burke 《Journal of sports sciences》2019,37(5):553-559

Carbohydrate (CHO) availability could alter mucosal immune responses to exercise. This study compared the effect of three dietary approaches to CHO availability on resting and post-exercise s-IgA levels. Elite race walkers (n = 26) adhered to a high CHO diet (HCHO), periodised CHO availability (PCHO) or a low CHO/high fat diet (LCHF) for 3 weeks while completing an intensified training program. HCHO and PCHO groups consumed 8.0–8.5 g.kg^?1 CHO daily, with timing of ingestion manipulated to alter CHO availability around key training sessions. The LCHF diet comprised 80% fat and restricted CHO to < 50 g.day^?1. A race walk test protocol (19 km females, 25 km males) was completed at baseline, after adaptation, and following CHO restoration. On each occasion, saliva samples were obtained pre- and post-exercise to quantify s-IgA levels. Resting s-IgA secretion rate substantially increased ~ two-fold post-intervention in all groups (HCHO: 2.2 ± 2.2, PCHO: 2.8 ± 3.2, LCHF: 1.6 ± 1.6; fold-change± 95% confidence limits), however, no substantial differences between dietary treatments were evident. Post-exercise, substantial 20–130% increases in s-IgA concentration and 43–64% reductions in flow rate occurred in all dietary treatments, with trivial differences evident between groups. It appears that high volume training overrides any effect of manipulating CHO availability on mucosal immunity in elite athletes.  相似文献   

Using a realist research methodology in policy analysis     

Megan Lourie  Elizabeth Rata 《Educational Philosophy and Theory》2017,49(1):17-30

The article describes the usefulness of a realist methodology in linking sociological theory to empirically obtained data through the development of a methodological device. Three layers of analysis were integrated: 1. the findings from a case study about Māori language education in New Zealand; 2. the identification and analysis of contradictions and vagueness in language education policy; and, 3. the explanation of these contradictions in terms deeper ideological forces underpinning bicultural politics in New Zealand. The paper makes two contributions to the literature. It demonstrates how a realist methodology can link theory and data, specifically in the discussion of the methodological device. It also generalises the findings in terms of how ideologies of ‘culture’ (i.e ‘culturalism’) inform the inclusion of culture in education in New Zealand and internationally.  相似文献   

“Leaps of faith”: parents' and professionals' viewpoints on preparing adolescents on the autism spectrum for leaving school          下载免费PDF全文

Megan Hatfield  Marita Falkmer  Torbjorn Falkmer  Marina Ciccarelli 《Journal of Research in Special Educational Needs》2017,17(3):187-197

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Third-party social interaction and word learning from video     

O'Doherty K  Troseth GL  Shimpi PM  Goldenberg E  Akhtar N  Saylor MM 《Child development》2011,82(3):902-915

In previous studies, very young children have learned words while "overhearing" a conversation, yet they have had trouble learning words from a person on video. In Study 1, 64 toddlers (mean age=29.8 months) viewed an object-labeling demonstration in 1 of 4 conditions. In 2, the speaker (present or on video) directly addressed the child, and in 2, the speaker addressed another adult who was present or was with her on video. Study 2 involved 2 follow-up conditions with 32 toddlers (mean age=30.4 months). Across the 2 studies, the results indicated that toddlers learned words best when participating in or observing a reciprocal social interaction with a speaker who was present or on video.  相似文献   

III. ATTACHMENT AND EMOTIONAL DEVELOPMENT IN INSTITUTIONAL CARE: CHARACTERISTICS AND CATCH UP     

Marian J. Bakermans‐Kranenburg  Howard Steele  Charles H. Zeanah  Rifkat J. Muhamedrahimov  Panayiota Vorria  Natasha A. Dobrova‐Krol  Miriam Steele  Marinus H. van IJzendoorn  Femmie Juffer  Megan R. Gunnar 《Monographs of the Society for Research in Child Development》2011,76(4):62-91

Attachment has been assessed in the extreme environment of orphanages, but an important issue to be addressed in this chapter is whether in addition to standard assessment procedures, such as the Strange Situation, the lack of a specific attachment in some institutionalized children should be taken into account given the limits to the development of stable relationships in institutionalized care. In addition, this chapter discusses disinhibited or indiscriminately friendly behavior that is often seen in institutionalized children. Enhanced caregiving quality alone appears to be insufficient to diminish indiscriminate behavior, at least in some children, as evidenced by the persistence of indiscriminate behavior in children adopted out of institutions into adoptive families. We suggest that the etiology and function of indiscriminate, “friendly” behavior may be different for institutionalized versus not‐institutionalized children. In the first case it may reflect a distortion or disruption of early attachment relationships; in the latter case it is likely to result from the lack of expected input in the form of contingent interactions with a stable caregiver in early life. We try to delineate infant and caregiver characteristics that are associated with secure attachment in institutional settings, given the inevitable fact that large numbers of infants worldwide are being raised, and will be raised, in contexts of institutional care. We conclude that much further study is needed of the development of children's attachments following adoption out of an institutional setting.  相似文献   

IV. GROWTH FAILURE IN INSTITUTIONALIZED CHILDREN     

Dana E. Johnson  Megan R. Gunnar 《Monographs of the Society for Research in Child Development》2011,76(4):92-126

Children within institutional care settings experience significant global growth suppression, which is more profound in children with a higher baseline risk of growth impairment (e.g., low birth weight [LBW] infants and children exposed to alcohol in utero). Nutritional insufficiencies as well as suppression of the growth hormone–insulin‐like growth factor axis (GH‐IGF‐1) caused by social deprivation likely both contribute to the etiology of psychosocial growth failure within these settings. Their relative importance and the consequent clinical presentations probably relate to the age of the child. While catch‐up growth in height and weight are rapid when children are placed in a more nurturing environment, many factors, particularly early progression through puberty, compromise final height. Potential for growth recovery is greatest in younger children and within more nurturing environments where catch‐up in height and weight is positively correlated with caregiver sensitivity and positive regard. Growth recovery has wider implications for child well‐being than size alone, because catch‐up in height is a positive predictor of cognitive recovery as well. Even with growth recovery, persistent abnormalities of the hypothalamic‐pituitary‐adrenal system or the exacerbation of micronutrient deficiencies associated with robust catch‐up growth during critical periods of development could potentially influence or be responsible for the cognitive, behavioral, and emotional sequelae of early childhood deprivation. Findings in growth‐restricted infants and those children with psychosocial growth are similar, suggesting that children experiencing growth restriction within institutional settings may also share the risk of developing the metabolic syndrome in adulthood (obesity, Type 2 diabetes mellitus, hypertension, heart disease). Psychosocial deprivation within any caregiving environment during early life must be viewed with as much concern as any severely debilitating childhood disease.  相似文献