Effect of Resistance Training and Creatine Supplementation on Bone Density in Young Men

The Purpose of this study was to determine the effect of ten weeks resistance training combined with creatine supplementation on bone mineral density (BMD) and association between mascle strength and lean body mass with bone mineral density in untrained young men. In order to, 16 young men (average age 23.2 􀁲 2.4 yrs) were randomizedto recive creatine (0.3g/kg for 7d and 0.05g/kg thereafter) or placebo while participating in resistance training. The training protocol consisted of thrice weekly using three sets of eight to ten repetition at 60-70% of 1-RM for whole-body exercise. Bone mineral density were determined by dual energy X-rayabsorptiometry befor and after training. Result showed that resistance training + supplement and resistance training + placebo caused significant increases (p<0.05) in muscular strength and lean body mass, but had no significant effect on bone mineral density, and in both group there was significant correlation between bench press with arm BMD, and leg press with leg BMD, also in both group there was significant correlation between leg lean body mass with leg BMD (p<0.05), however, all of this corrolations with increases of subjects body weight, strength and lean body mass, become no significant at ten week. In conclusion, these results suggested ten weeks resistance training combined with creatine supplement had no effect on BMD in young men and probably for osteogenic effect of increased loading (increase of muscle strength and mass) resulted of resistance training more time is need, and muscular strength as site specific is the most important predictor of BMD in untrained young men.