1. Heaney RP (1981) Paradox of irreversibility of age-related bone loss. In: Menczel J, Robin GC, Makin M, Sternberg R (eds) Osteoporosis. John Wiley & Sons, 1983. New York, pp 15–20
2. Roy Soc Med Int Cong Symp Series;CC Johnston,1983
3. Smith EL, Reddan W, Smith PE (1981) Physical activity and calcium modalities for bone mineral in aged women. Med Sci Sports Exercise 13:60–64
4. Krolner B, Toft B, Nielsen SP, Tondevold E (1983) Physical exercise as prophylaxis against involutional vertebral bone loss: a controlled trial. Clinical Science 64:541–546
5. Rubin CT, Lanyon LE (in press) Regulation of bone mass by peak strain magnitude. Transactions of the Orthopaedic Research Society, p 70, and Orthopaedic Transactions