Physical activity in Swedish and Chinese young children and their parents

摘要: Physical activity is believed to affect health, already in childhood. Studies of physical children under the age three are, however, sparse. The overall aim this thesis was explore and its possible correlates Swedish Chinese children, aged one two, at high low risk for obesity. levels patterns among parents Sweden China were also examined. Study I a calibration study where 15 36 months old, recruited from four preschools Stockholm, Sweden. data, measured with accelerometry, compared against data Children s Activity Rating Scale (CARS). Accelerometer count thresholds sedentary, lowand high-intensity derived (n=26) cross-validated (n=12). II-IV explorative cross-sectional studies levels, examined one(Study III) two-year-old (Studies II IV), participating Early STOPP (Stockholm Obesity Prevention Project) IV) III IV). their wore an accelerometer seven days assess average (counts per minute) time spent different intensities. Differences between weekdays weekend as correlations sex, body mass index (BMI), motor skills familyrelated factors. intensity developed found valid children. had intermittent pattern short bursts (Study II). At age, accumulated 2989 (SD 702) counts minute 57%, 34% 9% day respectively high-intensity. 1997 899) minutes 70% being 25% 5% varied more over day, counterparts In both countries, similar on days. No association BMI, or any family-related factor except positive fathers’ boys’ two (p<0.05, r=0.49 r=0.37 weekends) active than (p<0.05), mothers fathers countries (p<0.05) conclusion, young differ substantially countries. This indicates that can be markedly modified by environmental socio-cultural factors years age. SAMMANFATTNING Fysisk aktivitet tros paverka halsan redan i barndomen. Kunskapen om fysisk hos barn tre ar dock begransad. Det overgripande syftet med denna avhandling var att undersoka svenska och kinesiska ettoch tvaars aldern, hog, respektive lag fetma. Syftet ocksa faktorer mojlig koppling till alder. aktivitetsniva aktivitetsmonster bland foraldrar undersoktes ocksa. Studie en kalibreringsstudie dar mellan manader gamla rekryterades fran fyra forskolor Sverige. aktivitet, matt accelerometri, jamfordes Troskelvarden stillasittande, hog intensitet togs fram korsvaliderades For anvanded Sverige (Studie Kina Dessa utforskande tvarsnittsstudier aktivitetsniva, betydelse ett(Studie tvaarsaldern Barnen deras bar sju dygn mata genomsnittlig minut) tid spenderad olika intensitetsnivaer. Skillnader veckodagar helgdagar undersoktes, liksom samband kon, motorisk utveckling familjerelaterade faktorer. Troskelvardena framtagna visade sig vara valida tvaarsaldern. Svenska tvaaringar hade ett oregelbundet korta sekvenser av Vid alder ackumulerade minut spenderade 57% dagen lagintensiv hogintensiv aktivitet. Kinesiska varierade sina aktivitetsnivaer mer dagen, jamfort bada landerna aktivitetsnivaerna likartade helgdagar. Inget eller nagon familjerelaterad faktor fanns vid tva ars alder, forutom positivt faders soners pa helgdagar) aktiva modrar fader Sammanfattningsvis skiljer smabarn signifikant lander. Detta tyder kan paverkas avsevart omgivningsmassiga socio-kulturella faktorer, LIST OF SCIENTIFIC PAPERS I. Calibration cross-validation wrist-worn Actigraph GT3X+ preschoolers. E. Johansson, U. Ekelund, H. Nero, C. Marcus, M. Hagstromer. Pediatric Obesity, 2015, 10, 1-6 II. Objectively correlates. Hagstromer, V. Svensson, A. Ek, Forssen, Marcus. IJBNPA, 12, 3 III. one-year-old parents, study. Mei*, Johansson*, Y. Xiong, L. Zhang, J. Zhang**, Marcus**. Manuscript IV. – An comparison Xiu, Marcus**, Hagstromer**. Submitted *Shared first-authorship **Shared last-authorship CONTENTS