The positive effect of physical activity and exercise on bone mass is well documented in several studies comparing with sedentary subjects. Recent studies have reported that cardiovascular fi tness and weight-bearing exercise affect bone mass benefi cially. Although it is widely accepted that muscle strength is signifi cantly correlated with bone mass, little is known about anaerobic power and its relation to bone mass. Therefore, the purpose of this study was to analyse the relation between bone mass and anaerobic power in professional jumpers. Thirty professional men jumpers (long, high and triple jumping) with no history of bone disease participated in this study (mean±SD, aged 21.27±3.52 years, height 182±6 cm, weight 69.93±6.01 kg). Bone mineral content (BMC) and bone mineral density (BMD) were measured by dual-energy x-ray absorptiometry. Femoral neck and trochanter BMC and BMD for right and left sides and also lumbar spines were assessed. Sargent jump test was performed by athletes and records were converted to anaerobic power using Lewis formulae. Pearson correlation test was used to analyse data. Results of this study showed a positive relationship between femoral neck and trochanter BMC and anaerobic power (r=0.557, p<0.05). Similar result was found for femoral neck and trochanter BMD and anaerobic power (r=0.446, p<0.05). In conclusion, long-term jumping, is associated with markedly increased BMC and BMD at the femoral neck and trochanter and it can be accounted as one of the important environmental factors to determine femoral BMC and BMD in elite jumpers.
The health benefi ts of exercise are well established. Research has shown that exercise has a positive effect on bone health. Sport injuries are associated with several physical and physiological changes that lead to increased disability. Examples of these changes are deteriorations in bone and muscle tissues, referred, respectively, as osteopenia and sarcopenia. High peak bone mass in early adulthood is an important protective factor against osteoporotic fractures in later life, but relation between bone mass and sports injuries has been less documented. The main aim of this study was to determine the association between femoral neck, trochanter and lumbar spines bone mineral density (BMD) and bone mineral content (BMC) and injuries in professional jumpers. Thirty professional men jumpers (10 long, 10 high and 10 triple jumpers) with no history of bone disease participated in this study (mean±SD, aged 21.27±3.52 years, height 182±6 cm, weight 69.93±6.01 kg). BMD and BMC of femoral neck, trochanter for right and left sides and also lumbar spines were measured by dual-energy x-ray absorptiometry. Injury data of these professional jumpers over a 1-year time period (2008-2009) were collected using a standard questionnaire retrospectively. Data were analysed using Pearson correlation test. Results of this study showed an indirect but non-signifi cant correlation between BMD and bone-related injuries (r=0.306, p>0.05). A signifi cant negative association between BMC and bone-related injuries was observed (r=0.359, p<0.05). There were no signifi cant correlations between BMD or BMC and ligamentous, muscular and tendinous injuries (r=0.123, p>0.05; r=0.264, p>0.05), respectively. It can be concluded that long time jumping results in high BMC and decreased risk of bone-related injuries in elite jumpers.on 30 April 2019 by guest. Protected by copyright.
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