Dynamic Standing

A study compared the effect of a dynamic versus static prone stander on the bone mineral density and behaviour of four preschool children with severe cerebral palsy. The children participated in an eight week standing programme, standing for 30 mins each day five days per week. The authors of the study were interested in replicating results previously observed in studies where intermittent loads had a greater effect on bone mineral density than static loads (Lanyon and Rubin 1984; Rubin and Lanyon 1984; and Biewener and Bertram 1994).

Three of the children in the study showed an increase in bone mineral density in the lumbar spine, proximal femur and / or distal femur. The most significant increases were seen in the distal femur of three of the subjects.  The authors hypothesise that this larger increase was due these being sites of trabecular bone (having a higher remodelling rate). Generally they did not find significant differences between static and dynamic prone standers but attributed this to the fact that the programme used in this study may not have been sufficient in duration (30 minute sessions only) when compared to the previous study, to produce more significant changes in bone mineral density bone mineral density. Limitations of this study were its particularly small sample size (four subjects) and the authors reported difficulties making measurements.



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