高校问答牙齿不好是缺钙吗:翻译下面文章
来源：百度文库 编辑：高校问答 时间：2024/05/07 06:30:38
Changes in cervical spine bone mineral density in response to flight training.
BACKGROUND: High magnitude loads and unusual loading regimes are two important determinants for increasing bone mass. Past research demonstrated that positive Gz-induced loading, providing high loads in an unaccustomed manner, had an osteogenic effect on bone. Another determinant of bone mass is that the bone response to loading is site specific. This study sought to further investigate the site specific bone response to loading, examining the cervical spine response, the site suspected of experiencing the greatest loading, to high performance flight. METHODS: Bone mineral density (BMD) and bone mineral content (BMC) was monitored in 9 RAAF trainee fighter pilots completing an 8-mo flight training course on a PC-9 and 10 age-height-weight-matched controls. RESULTS: At completion of the course, the pilots had a significant increase in cervical spine BMD and total body BMC. No significant changes were found for the control group. CONCLUSIONS: This study demonstrated that the physical environment associated with flight training may have contributed to a significant increase in cervical spine bone mass in the trainee PC-9 pilots. The increase in bone mass was possibly a response to the strain generated by the daily wearing of helmet and mask assembly under the influence of positive sustained accelerative forces.
BACKGROUND: High magnitude loads and unusual loading regimes are two important determinants for increasing bone mass. Past research demonstrated that positive Gz-induced loading, providing high loads in an unaccustomed manner, had an osteogenic effect on bone. Another determinant of bone mass is that the bone response to loading is site specific. This study sought to further investigate the site specific bone response to loading, examining the cervical spine response, the site suspected of experiencing the greatest loading, to high performance flight. METHODS: Bone mineral density (BMD) and bone mineral content (BMC) was monitored in 9 RAAF trainee fighter pilots completing an 8-mo flight training course on a PC-9 and 10 age-height-weight-matched controls. RESULTS: At completion of the course, the pilots had a significant increase in cervical spine BMD and total body BMC. No significant changes were found for the control group. CONCLUSIONS: This study demonstrated that the physical environment associated with flight training may have contributed to a significant increase in cervical spine bone mass in the trainee PC-9 pilots. The increase in bone mass was possibly a response to the strain generated by the daily wearing of helmet and mask assembly under the influence of positive sustained accelerative forces.
在训练班机之后的在颈背骨骨头方面的改变矿物密度。
背景: 高的大小负荷和不寻常的载入政权是为逐渐增加的骨质二个重要的决定因素。过去研究示范了那个积极的感应 Gz 的载入,以不习惯的方式提供高的负荷,在骨头上有 osteogenic 招致。 骨质的另外一个决定因素是载入的骨头回应是位置特性。这一项研究寻找更进一步调查对载入的位置特性骨头回应,检查颈背骨回应，被怀疑经历最好的载入位置,对高的表现飞行。 方法:去骨矿物密度 (BMD) 和内容 (BMC) 被检测在 9位 RAAF 练习生斗士飞行员完成一次 8 mo 的飞行教育在个人计算机 -9 和 10 年龄-高度-重量相配的控制方面的课程骨头矿物。 结果: 在课程的完成，飞行员有了颈背骨 BMD 和总身体 BMC 的重要增加。 没有重要的变化为控制团体被发现。 结论: 这一项研究示范被和飞行教育联合的实际环境可能已经对练习生个人计算机 -9 飞行员的颈背骨骨质的重要增加有助益。 骨质的增加可能地是对被每日的钢盔穿着和假面具在积极的维持 accelerative 力量的影响力下面的集会产生的紧张一个回应。