TY - JOUR
T1 - Impact of physical activity, sedentary behaviour and muscle strength on bone stiffness in 2-10-year-old children-cross-sectional results from the IDEFICS study
AU - Herrmann, Diana
AU - Buck, Christoph
AU - Sioen, Isabelle
AU - Kouride, Yiannis
AU - Marild, Staffan
AU - Molnár, Dénes
AU - Mouratidou, Theodora
AU - Pitsiladis, Yannis
AU - Russo, Paola
AU - Veidebaum, Toomas
AU - Ahrens, Wolfgang
AU - IDEFICS Consortium
N1 - This work was performed as part of the IDEFICS study (www.ideficsstudy.eu). We gratefully acknowledge the financial support of the European community within the Sixth RTD Framework Programme (FOOD, Grant n°: 016181). Isabelle Sioen is financially supported by the Research Foundation - Flanders (Grant n°: 1.2.683.14.N.00). We also thank Florence Samkange-Zeeb for proof-reading the manuscript and language editing.
Publisher Copyright:
© 2015 Herrmann et al.
PY - 2015/9/17
Y1 - 2015/9/17
N2 - Background: Physical activity (PA), weight-bearing exercises (WBE) and muscle strength contribute to skeletal development, while sedentary behaviour (SB) adversely affects bone health. Previous studies examined the isolated effect of PA, SB or muscle strength on bone health, which was usually assessed by x-ray methods, in children. Little is known about the combined effects of these factors on bone stiffness (SI) assessed by quantitative ultrasound. We investigated the joint association of PA, SB and muscle strength on SI in children. Methods: In 1512 preschool (2-<6years) and 2953 school children (6-10 years), data on calcaneal SI as well as on accelerometer-based sedentary time (SED), light (LPA), moderate (MPA) and vigorous PA (VPA) were available. Parents reported sports (WBE versus no WBE), leisure time PA and screen time of their children. Jumping distance and handgrip strength served as indicators for muscle strength. The association of PA, SB and muscle strength with SI was estimated by multivariate linear regression, stratified by age group. Models were adjusted for age, sex, country, fat-free mass, daylight duration, consumption of dairy products and PA, or respectively SB. Results: Mean SI was similar in preschool (79.5±15.0) and school children (81.3±12.1). In both age groups, an additional 10min/day in MPA or VPA increased the SI on average by 1 or 2%, respectively (p≤.05). The negative association of SED with SI decreased after controlling for MVPA. LPA was not associated with SI. Furthermore, participation in WBE led to a 3 and 2% higher SI in preschool (p=0.003) and school children (p<.001), respectively. Although muscle strength significantly contributed to SI, it did not affect the associations of PA with SI. In contrast to objectively assessed PA, reported leisure time PA and screen time showed no remarkable association with SI. Conclusion: This study suggests that already an additional 10min/day of MPA or VPA or the participation in WBE may result in a relevant increase in SI in children, taking muscle strength and SB into account. Our results support the importance of assessing accelerometer-based PA in large-scale studies. This may be important when deriving dose-response relationships between PA and bone health in children.
AB - Background: Physical activity (PA), weight-bearing exercises (WBE) and muscle strength contribute to skeletal development, while sedentary behaviour (SB) adversely affects bone health. Previous studies examined the isolated effect of PA, SB or muscle strength on bone health, which was usually assessed by x-ray methods, in children. Little is known about the combined effects of these factors on bone stiffness (SI) assessed by quantitative ultrasound. We investigated the joint association of PA, SB and muscle strength on SI in children. Methods: In 1512 preschool (2-<6years) and 2953 school children (6-10 years), data on calcaneal SI as well as on accelerometer-based sedentary time (SED), light (LPA), moderate (MPA) and vigorous PA (VPA) were available. Parents reported sports (WBE versus no WBE), leisure time PA and screen time of their children. Jumping distance and handgrip strength served as indicators for muscle strength. The association of PA, SB and muscle strength with SI was estimated by multivariate linear regression, stratified by age group. Models were adjusted for age, sex, country, fat-free mass, daylight duration, consumption of dairy products and PA, or respectively SB. Results: Mean SI was similar in preschool (79.5±15.0) and school children (81.3±12.1). In both age groups, an additional 10min/day in MPA or VPA increased the SI on average by 1 or 2%, respectively (p≤.05). The negative association of SED with SI decreased after controlling for MVPA. LPA was not associated with SI. Furthermore, participation in WBE led to a 3 and 2% higher SI in preschool (p=0.003) and school children (p<.001), respectively. Although muscle strength significantly contributed to SI, it did not affect the associations of PA with SI. In contrast to objectively assessed PA, reported leisure time PA and screen time showed no remarkable association with SI. Conclusion: This study suggests that already an additional 10min/day of MPA or VPA or the participation in WBE may result in a relevant increase in SI in children, taking muscle strength and SB into account. Our results support the importance of assessing accelerometer-based PA in large-scale studies. This may be important when deriving dose-response relationships between PA and bone health in children.
KW - Accelerometer
KW - Bone stiffness
KW - Muscle strength
KW - Physical activity
KW - Quantitative evidence
KW - Quantitative ultrasound
KW - Sedentary behaviour
KW - Weight-bearing exercise
UR - http://www.scopus.com/inward/record.url?scp=84941637092&partnerID=8YFLogxK
U2 - 10.1186/s12966-015-0273-6
DO - 10.1186/s12966-015-0273-6
M3 - Journal article
C2 - 26377674
AN - SCOPUS:84941637092
SN - 1479-5868
VL - 12
JO - International Journal of Behavioral Nutrition and Physical Activity
JF - International Journal of Behavioral Nutrition and Physical Activity
IS - 1
M1 - 112
ER -
