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Excerpt
The purpose of this prospective 6-year follow-up study was to investigate the effects of reduced training and cessation of training on female weight- and powerlifters' (n=14) BMD at lumbar spine and femoral neck. The baseline measurements were done in 1991 when the mean age of the subjects was 25.3±6.8 years and they had competed 4.4±2.5 years. The follow-up DXA-measurements were performed in 1994 and 1996. In 1996 there were 6 subjects who had reduced their training 11.3 ±5.4 months before the first follow-up, while 8 subjects had continued training at the same level than 1991. 1996 measurements revealed there were 5 subjects who had continued training, 6 who had reduced training 28 ±14 months before the final measurements, and 3 subjects who had ceased training 7, 9, and 13 months before the last measurement. Even if the BMD values seemed to increase more in athletes who had continued their training at the same level than in those who had reduced the training, the BMD changes from 1991 to 1994 and 1996 were not significantly different between the groups. However, the mean ten months cessation of training seemed to have a negative effect on BMD at the lumbar spine (−2.4%) and femoral neck (−2.7%) comparing to the 3.4% increase (p=0.001) in the continued athletes (n=5) and 1.2% increase (p=0.019) in athletes with reduced training (n=6) (p=0.019). These results suggest that strength training-induced bone adaptations may be retained during reduced training but not after cessation of the training.
