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Eivind Aadland Ada Kristine Ofrim Nilsen Einar Ylvisåker Kjersti Johannessen Sigmund Alfred Anderssen 《Journal of sports sciences》2020,38(10):1132-1139
ABSTRACT Reliability of accelerometer-determined physical activity (PA), and thus the required length of a monitoring period, appears to depend on the analytic approach used for its calculation. We compared reliability of objectively measured PA using different resolution of data in a sample of 221 Norwegian 2–6-year-old children providing 2–3 valid 14-day periods of accelerometer monitoring (ActiGraph GT3X+) during September–October, January–February, and May–June 2015–2016. Reliability (intra-class correlation [ICC]) was measured for 1–14 days of monitoring across the measurement periods using linear mixed effect modelling. These results were compared to reliability estimated using different resolution of data using the Spearman–Brown formula. The measured reliability improved only marginally with increased monitoring length and levelled off after 5–6 days. Estimated reliability differed substantially when derived from different resolution of data: 3.9–5.4, 6.7–9.2, 13.4–26.7 and 26.3–87.7 days of monitoring was required to achieve an ICC = 0.80 using an hour-by-hour, a day-by-day, a week-by-week and a period-by-period approach, respectively. Reliability could not be correctly estimated from any single resolution of data. We conclude that reconsideration is needed with regard to how reproducibility of objectively measured PA is analysed and interpreted. 相似文献
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Alfred Bork 《The Internet and Higher Education》2000,3(4):358
We are at a critical moment in the history of human learning, and in the history of humans. Learning is very important in our future. With 6 billion people on Earth, going to 9 billion by the middle of the century, current educational systems everywhere at all levels have major problems, probably not solvable with present approaches. In many areas, little education is available. We need new learning modes and structures, and we need them quickly and globally. Creating new learning materials and systems will require great imagination. We need approaches that go beyond current situations. Learning should be greatly improved, less expensive, and available lifelong for all in all subjects. We need a society that focuses on learning, where everyone loves to learn. Solving many of the world's problems, including population, water, violence, health, and environmental destruction, will depend on improving learning. One neglected source of future ideas is fictional accounts of the future of learning. I have long found them helpful in my own thinking and have written about them before. I keep finding new sources of this kind. Some, not mentioned here, are negative views. 相似文献
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Alfred Rigling 《Journal of The Franklin Institute》1920,189(1):111-113
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