Institute of Sport Sciences and Physiotherapy, Faculty of Medicine, University of Tartu, Tartu, Estonia -
Institute of Sport Sciences and Physiotherapy, Faculty of Medicine, University of Tartu, Tartu, Estonia.
J Sports Med Phys Fitness. 2023 Nov;63(11):1182-1187. doi: 10.23736/S0022-4707.23.15067-5. Epub 2023 Jul 24.
This study aimed to compare the relationships between bone and body composition parameters, and isometric maximal voluntary contraction (MVC) force of knee extensor (KE) muscles in road cyclists and untrained controls.
Twelve male road cyclists and 12 controls aged 20-34 years participated. The isometric MVC force of the KE muscles was assessed by a custom-made dynamometer. Bone mineral content (BMC), bone mineral density (BMD), and body composition were assessed using Dual-Energy X-ray Absorptiometry.
No differences were found in body mass, lean body mass, leg lean mass, MVC, whole body, and leg BMD and BMC between cyclists and controls. Controls had a significantly greater (P<0.001) body mass index (BMI), whole body (P<0.01), and leg fat (P<0.001) mass than athletes. In road cyclists, BMC correlated positively with body mass (r=0.73; P<0.01) and BMI (r=0.65; P<0.05), body (r=0.85; P<0.001) and leg lean mass (r=0.81; P<0.001); BMD correlated positively with lean body mass (r=0.60; P<0.05), leg lean mass (r=0.65 and r=0.60; P<0.05). MVC of KE muscles correlated positively with bone parameters (P<0.01) and lean mass (P<0.05) only in controls.
Regular cycling training was associated with lower BMI, and body and leg fat mass. There were no significant differences in bone parameters, body and leg lean mass, and isometric MVC force of KE muscle variables between road cyclists and controls. In road cyclists, bone parameters are associated with body mass, and body and leg lean mass, but not with the isometric strength of KE muscles.
本研究旨在比较骨和身体成分参数与膝关节伸肌（KE）等速最大自主收缩（MVC）力量之间的关系，研究对象为公路自行车运动员和未经训练的对照组。
12 名年龄在 20-34 岁的男性公路自行车运动员和 12 名对照组参加了此项研究。使用定制的测力计评估 KE 肌肉的等速 MVC 力量。通过双能 X 射线吸收法评估骨矿物质含量（BMC）、骨矿物质密度（BMD）和身体成分。
自行车运动员和对照组之间的体重、瘦体重、腿部瘦体重、MVC、全身和腿部 BMD 和 BMC 无差异。对照组的体重指数（BMI）、全身（P<0.01）和腿部脂肪（P<0.001）质量明显大于运动员。在公路自行车运动员中，BMC 与体重呈正相关（r=0.73；P<0.01）和 BMI（r=0.65；P<0.05）、身体（r=0.85；P<0.001）和腿部瘦体重（r=0.81；P<0.001）；BMD 与瘦体重呈正相关（r=0.60；P<0.05）、腿部瘦体重（r=0.65 和 r=0.60；P<0.05）。仅在对照组中，KE 肌肉的 MVC 与骨参数（P<0.01）和瘦体重（P<0.05）呈正相关。
定期的自行车训练与较低的 BMI 以及身体和腿部脂肪质量相关。公路自行车运动员和对照组之间的骨参数、身体和腿部瘦体重以及 KE 肌肉等速 MVC 力量无显著差异。在公路自行车运动员中，骨参数与体重和身体及腿部瘦体重相关，但与 KE 肌肉的等长强度无关。
