Varley Ian, Hughes David C, Greeves Julie P, Fraser William D, Sale Craig
Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement Research Centre, Nottingham Trent University, Nottingham, Nottingham Trent University, United Kingdom of Great Britain and Northern Ireland.
Biomedical Sciences, Nottingham Trent University, Nottingham, United Kingdom of Great Britain and Northern Ireland.
Int J Sports Med. 2017 May;38(5):341-346. doi: 10.1055/s-0042-124510. Epub 2017 Mar 1.
Habitual football participation has been shown to be osteogenic, although the specific volume of football participation required to cause bone adaptations are not well established. The aim of the present study is to investigate tibial bone adaptations in response to 12 weeks of increased training volume in elite adolescents who are already accustomed to irregular impact training. 99 male adolescent elite footballers participated (age 16±0 y; height 1.76±0.66 m; body mass 70.2±8.3 kg). Tibial scans were performed using peripheral quantitative computed tomography immediately before and 12 weeks after an increase in football training volume. Scans were obtained at 4, 14, 38 and 66% of tibial length. Trabecular density (mg/cm), cortical density (mg/cm), cross-sectional area, cortical area (mm), cortical thickness (mm) and strength strain index (mm) were assessed. Trabecular (4%) and cortical density (14, 38%), cortical cross-sectional area (14, 38%), total cross-sectional area (66%), cortical thickness (14, 38%) and strength strain index (14, 38%) increased following 12 weeks of augmented volume training (P<0.05). Increased density of trabecular and cortical compartments and cortical thickening were shown following an increased volume of training. These adaptive responses may have been enhanced by the adolescent status of the cohort, supporting the role of early exercise intervention in improving bone strength.
习惯性参与足球运动已被证明具有成骨作用，尽管引起骨骼适应性变化所需的具体足球参与量尚未明确。本研究的目的是调查在已经习惯不规则冲击训练的精英青少年中，12周增加训练量后胫骨的骨骼适应性变化。99名男性青少年精英足球运动员参与了研究（年龄16±0岁；身高1.76±0.66米；体重70.2±8.3千克）。在足球训练量增加前及增加后12周，使用外周定量计算机断层扫描对胫骨进行扫描。扫描在胫骨长度的4%、14%、38%和66%处进行。评估小梁密度（毫克/立方厘米）、皮质密度（毫克/立方厘米）、横截面积、皮质面积（平方毫米）、皮质厚度（毫米）和强度应变指数（毫米）。经过12周的增加量训练后，小梁（4%处）和皮质密度（14%、38%处）、皮质横截面积（14%、38%处）、总横截面积（66%处）、皮质厚度（14%、38%处）和强度应变指数（14%、38%处）均有所增加（P<0.05）。训练量增加后，小梁和皮质部分的密度增加以及皮质增厚得以显现。这些适应性反应可能因该队列的青少年状态而增强，这支持了早期运动干预在提高骨强度方面的作用。
