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How does a physical activity programme in elementary school affect fracture risk? A prospective controlled intervention study in Malmo, Sweden.

ABSTRACT: Recent evidence from the 7-year follow-up of the Pediatric Osteoporosis Prevention (POP) study indicates an inverse correlation between years of participation in a physical activity (PA) intervention and fracture risk in children. However, we could not see a statistically significant reduction in fracture risk, which urged for an extension of the intervention.The study was conducted in 4 neighbouring elementary schools, where 1 school functioned as intervention school.We included all children who began first grade in these 4 schools between 1998 and 2012. This resulted in 1339 children in the intervention group and 2195 children in the control group, all aged 6-8?years at the state of the study.We launched an 8-year intervention programme with 40?min of moderate PA per school day, while the controls continued with the Swedish national standard of 60?min of PA per week.We used the regional radiographic archive to register objectively verified fractures and we estimated annual fracture incidences and incidence rate ratios (IRRs).During the first year after initiation of the intervention, the fracture IRR was 1.65 (1.05 to 2.08) (mean 95% CI). For each year of the study, the fracture incidence rate in the control group compared with the intervention group increased by 15.7% (5.6% to 26.8%) (mean 95% CI). After 8?years, the IRR of fractures was 52% lower in the intervention group than in the control group (IRR 0.48 (0.25 to 0.91) (mean 95% CI))].Introduction of the school-based intervention programme is associated with a higher fracture risk in the intervention group during the first year followed by a gradual reduction, so that during the eighth year, the fracture risk was lower in the intervention group.NCT00633828.

SUBMITTER: Coster ME

PROVIDER: S-EPMC5337742 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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How does a physical activity programme in elementary school affect fracture risk? A prospective controlled intervention study in Malmo, Sweden.

Cöster Marcus E ME Fritz Jesper J Nilsson Jan-Åke JÅ Karlsson Caroline C Rosengren Björn E BE Dencker Magnus M Karlsson Magnus K MK

BMJ open 20170223 2

<h4>Objectives</h4>Recent evidence from the 7-year follow-up of the Pediatric Osteoporosis Prevention (POP) study indicates an inverse correlation between years of participation in a physical activity (PA) intervention and fracture risk in children. However, we could not see a statistically significant reduction in fracture risk, which urged for an extension of the intervention.<h4>Setting</h4>The study was conducted in 4 neighbouring elementary schools, where 1 school functioned as intervention ...[more]

PMID: 28235964

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Project description:BackgroundThe hand is the second most fractured region in children. It is therefore important to update fracture epidemiology to be able to identify time trends for adequate health care planning. This study reports pediatric hand fracture incidence 2014-2016 and, using published data, also long-term time trends in 1950-2016.Patients and methodsThe Swedish city of Malmö, with 328,494 inhabitants in 2016, has only one hospital. We used the hospital radiological archive, medical charts, and diagnosis registry to identify hand fractures in city residents < 16 years in 2014-2016. These data were compared to those from three published studies that evaluated periods in 1950-2006. Differences between two periods were calculated as both unadjusted and age- and sex-adjusted incident rate ratios (IRR) with 95% confidence intervals (95% CI). We used joinpoint regression to estimate time trends during the entire period and present annual percent changes (APC) with 95% CI.ResultsIn 2014-2016 phalangeal fractures accounted for 71% of all hand fractures, metacarpal fractures for 24%, and carpal fractures for 5%. We identified 615 hand fractures (419 in boys and 196 in girls) during 181,617 person-years in 2014-2016, resulting in an unadjusted pediatric hand fracture incidence of 339/100,000 person-years (boys 452/100,000 person-years and girls 220/100,000 person-years). The age-adjusted incidence 2014-2016 was similar to 2005-2006, the most recently evaluated period (IRR in boys 0.9; 95% CI 0.8 to 1.01, and in girls 1.0; 95% CI 0.8 to 1.2). Looking at the entire period 1950-2016, we found that age-adjusted incidence increased in 1950-1979, in boys by APC + 3.8%; 95% CI 3.0 to 4.5 and in girls by + 3.9%; 95% CI 2.8 to 5.0, but decreased in 1979-2016, in boys by - 0.7%; 95% CI - 1.4 to - 0.003, and girls by - 1.3%; 95% CI - 2.4 to - 0.1.ConclusionsPhalangeal fractures accounted for about three quarters of all hand fractures. The age-adjusted hand fracture incidence increased in both sexes in 1950-1979 and decreased in 1979-2016.Level of evidenceIII.

Project description:BackgroundThe aim of this study was to describe hand fracture epidemiology/etiology in city children and describe time trend during six decades.Patients and methodsA single hospital serves the entire city population of 271,271 (year 2005). Through the hospital medical and radiological archives, we collected epidemiology and etiology data concerning pediatric (age < 16 years) hand fractures in city residents, treated during 2005-2006. We compared these data to previously collected data in in the same city during 12 evaluated periods from 1950/1955 to 1993-1994. We present period-specific crude and age- and gender-adjusted fracture incidence rates and group differences as incidence rate ratios (RR) with 95% confidence intervals (95% CI).ResultsIn 2005-2006, we identified 414 hand fractures (303 in boys and 111 in girls), 247 phalangeal fractures (60% of all hand fractures), 140 metacarpal/carpal fractures (except the scaphoid bone) (34%), and 27 scaphoid fractures (6%). The crude hand fracture rate in children was 448/100,000 person years (639/100,000 in boys and 247/100,000 in girls), with a 2.5 times higher age-adjusted incidence in boys than in girls. Compared to 1950/1955, the age and gender-adjusted hand fracture incidence was twice as high in 2005-2006 and more than twice as high in 1976-1979. Compared to 1976-1979, we found no significant difference in the age and gender-adjusted hand fracture incidence in 2005-2006. In 2005-2006, sports injuries explained 42%, fights 20%, and traffic accidents 13% of the hand fractures. In 1950/1955, sports injuries explained 27% of fractures, fights 10%, and traffic accidents 21%.ConclusionsThe incidence of hand fractures in children was more than twice as high in the end of the 1970s compared to the 1950s, where after no significant change could be found. Also, fracture etiology has changed. New studies are needed, to adequately allocate health care resources and identify new fracture prone activities suitable for preventive measures.Level of evidenceIII.

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How does a physical activity programme in elementary school affect fracture risk? A prospective controlled intervention study in Malmo, Sweden.

Publications

How does a physical activity programme in elementary school affect fracture risk? A prospective controlled intervention study in Malmo, Sweden.

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