[ comparison of bone mineral density and muscle strength of athletic and non-athletic girls on two groups [volleyball and taekwondo]]

ABSTRACT

The aim of this research was to investigate bone mineral density [BMD], bone mineral content [BMC], muscular strength and anthropometric characterstic in athletic girls [volleybal player and taekwondo groups] and was compared with non athletic girls. 15 girls athletic volleybal player with mean age [20.66 +/- 3.3], mean height [165 +/- 5.52] and mean weight [58.9 +/- 6.08] and 13 taekwondo player girls with mean age [19.69 +/- 2.78], mean height [161 +/- 5.61] and mean weight [56.2 +/- 5.01] and 12 non-athletic girls with mean age [21.5 +/- 1.9], mean height [160 +/- 4.19] and mean weight [52 +/- 6.54] as control were selected voluntraily. Results showed that 1- There was not significant difference in BMD of three lumbar [L[2], L[3], L[4] ] among athletic and non-athletic groups, although BMD of volleyball players was greater than other groups. 2- mean BMD of femur [wall and neck] was greater in volleybal players but this was not significantly different. 3- Mean muscular strength of hamstring and quadriceps [in concentriic contraction] of both athletic groups was significantly greater than non-athletic group; there was not significant difference between two athletic groups. In general our results showed that athletic groups had greater BMD than non-athletic group, except that taekwondo players had a low BMD at lumbar [L[2], L[3], L[4] ] because ninety percent of bone growth is accomplished during the age of 10 to 20. So teens must be taught to take proper dietary program and have exercise in order to have healthy and strong bones to prevent bone related disease in adolescent