[PubMed] • Kallinen M. Markku A Aging, physical =ctivity and sports injuries. Sports =ed. 1995;20:41-52.&nbs=; [PubMed] • Yamazaki S. Ichimura S. Iwamoto J. =akeda T. Toyama Y Effect of walking exercise on bone metabolism in =ostmenopausal women with osteopenia/osteoporosis. J Bone Miner Metab. 2004;22:5