GREATER BONE MASS IN MALE ADOLESCENTS BEFORE ENTERING INTENSIVE SOCCER TRAINING THAN CONTROLS

OLIVERI B; PARISI MS; ORTEGA PABLO; FABIANA SOLIS; MAUTALEN C

rio de Janeiro - Brasil

Congreso; VI ANUAL MEETING DE LA INTERNATIONAL SOCIETY OF CLINICAL DENSITOMETRY; 2000

ICSD

Intensive high impact exercise promotes bone mass gain during growth. Increments of bone mineral density (BMD), bone mineral content (BMC) and also bone projected area (BA) were described. The controversy is whether the observed effect of vigorous exercise on bone mas might be due to a preselection of candidates with high genetic handicap for competitive sports or to the practice itself The total skeleton (TS) and subregions bone mineral content ±(BMC), bone mineral density (BMD) bone projected area (BA) and body composition were measured by dual energy x ray absorptiometry (DXA) in a group of male adolescents before entering intensive amateur soccer training (n=23) and age and BMI-matched (n=23 ) controls. The average age was 13.9 years. TS BMC was 11% (p<0.014) higher in future players, with greater BMC values in legs( +15%,p< 0.0001) and in pelvis (+23%, p< 0.0001). BMD was also higher (+10%,p<0.0001)) over the TS and all the subregions except head. There was no difference in TS BA and pelvis was the only site with greater BA in the future players (+8%,p<0.0001). Lean mass was slightly higher in the future players (47.9 ±4.0 vs 45.7±±(BMC), bone mineral density (BMD) bone projected area (BA) and body composition were measured by dual energy x ray absorptiometry (DXA) in a group of male adolescents before entering intensive amateur soccer training (n=23) and age and BMI-matched (n=23 ) controls. The average age was 13.9 years. TS BMC was 11% (p<0.014) higher in future players, with greater BMC values in legs( +15%,p< 0.0001) and in pelvis (+23%, p< 0.0001). BMD was also higher (+10%,p<0.0001)) over the TS and all the subregions except head. There was no difference in TS BA and pelvis was the only site with greater BA in the future players (+8%,p<0.0001). Lean mass was slightly higher in the future players (47.9 ±4.0 vs 45.7±±4.0 vs 45.7± 4.2 kg,, NS) and fat mass was greater in the control group (9.4±4.0 vs 5.8±1.3 kg, p<0.01). The TS BMC was significantly correlated with weight, height and lean mass in both groups while BMD was only corrlated with those parameters in future players. The physical activity in the previous 7 years was negatively corrrelated to fat mass (r =-.48,p<0.01) and was higher in FP than in controls( 5.9±2.0 vs 4.2±3.9 p?). The calcium intake was similar in both groups (FP:917±377 vs C: 1076±483 mg/day) and was not correlated with bone mass( r =0.03). In conclusion male adolescents before begining amateur intensive soccer training have higher total BMD and BMC ( with greater values in legs and pelvis) and only higher BA in the pelvis subregion . The lower fat mass in the future players suggest more intensive physical activity before this study. Longitudinal yearly measurements will be performed in both groups to assess the influence of intensive high impact training on th preeixisting bone mass and body composition differences between groups±4.0 vs 5.8±1.3 kg, p<0.01). The TS BMC was significantly correlated with weight, height and lean mass in both groups while BMD was only corrlated with those parameters in future players. The physical activity in the previous 7 years was negatively corrrelated to fat mass (r =-.48,p<0.01) and was higher in FP than in controls( 5.9±2.0 vs 4.2±3.9 p?). The calcium intake was similar in both groups (FP:917±377 vs C: 1076±483 mg/day) and was not correlated with bone mass( r =0.03). In conclusion male adolescents before begining amateur intensive soccer training have higher total BMD and BMC ( with greater values in legs and pelvis) and only higher BA in the pelvis subregion . The lower fat mass in the future players suggest more intensive physical activity before this study. Longitudinal yearly measurements will be performed in both groups to assess the influence of intensive high impact training on th preeixisting bone mass and body composition differences between groups±2.0 vs 4.2±3.9 p?). The calcium intake was similar in both groups (FP:917±377 vs C: 1076±483 mg/day) and was not correlated with bone mass( r =0.03). In conclusion male adolescents before begining amateur intensive soccer training have higher total BMD and BMC ( with greater values in legs and pelvis) and only higher BA in the pelvis subregion . The lower fat mass in the future players suggest more intensive physical activity before this study. Longitudinal yearly measurements will be performed in both groups to assess the influence of intensive high impact training on th preeixisting bone mass and body composition differences between groups±377 vs C: 1076±483 mg/day) and was not correlated with bone mass( r =0.03). In conclusion male adolescents before begining amateur intensive soccer training have higher total BMD and BMC ( with greater values in legs and pelvis) and only higher BA in the pelvis subregion . The lower fat mass in the future players suggest more intensive physical activity before this study. Longitudinal yearly measurements will be performed in both groups to assess the influence of intensive high impact training on th preeixisting bone mass and body composition differences between groups