Physical activity and bone: May the force be with you

Jonathan H. Tobias*, Virginia Gould, Luke Brunton, Kevin Deere, Joern Rittweger, Matthijs Lipperts, Bernd Grimm

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

39 Citations (Scopus)


Physical activity (PA) is thought to play an important role in preventing bone loss and osteoporosis in older people. However, the type of activity that is most effective in this regard remains unclear. Objectively measured PA using accelerometers is an accurate method for studying relationships between PA and bone and other outcomes. We recently used this approach in the Avon Longitudinal Study of Parents and Children (ALSPAC) to examine relationships between levels of vertical impacts associated with PA and hip bone mineral density (BMD). Interestingly, vertical impacts >4g, though rare, largely accounted for the relationship between habitual levels of PA and BMD in adolescents. However, in a subsequent pilot study where we used the same method to record PA levels in older people, no >4g impacts were observed. Therefore, to the extent that vertical impacts need to exceed a certain threshold in order to be bone protective, such a threshold is likely to be considerably lower in older people as compared with adolescents. Further studies aimed at identifying such a threshold in older people are planned, to provide a basis for selecting exercise regimes in older people which are most likely to be bone protective.

Original languageEnglish
Article numberArticle 20
JournalFrontiers in Endocrinology
Issue numberMAR
Publication statusPublished - 2014
Externally publishedYes


  • BMD
  • Bone
  • Exercise
  • Impact loading
  • Physical activity


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