Orssatto Lucas Bet da Rosa, Bezerra Ewertton de Souza, Moura Bruno Monteiro de, de Castro João Antônio Chula, Silva Diego Augusto Santos, Moro Antônio Renato Pereira, Diefenthaeler Fernando
Universidade Federal de Santa Catarina, Santa Catarina, Brazil.
Universidade Federal de Santa Catarina, Santa Catarina, Brazil; Universidade Federal do Amazonas, Brazil.
J Bodyw Mov Ther. 2018 Jul;22(3):586-591. doi: 10.1016/j.jbmt.2017.09.020. Epub 2017 Sep 28.
The aims of this pilot study were to verify which muscle strength tests better explain bone mineral content (BMC) of the femoral neck and lumbar spine and to develop predictive equations to estimate femoral neck and lumbar spine BMC. Twenty-nine subjects aged 56-76 years old (12 women and 17 men) participated in the study. Femoral neck and lumbar spine BMC was evaluated by Dual X-ray absorptiometry (DXA). Muscle strength measurements included maximal isometric voluntary contractions of knee extensors and flexors, vertical jump, 5-repetition maximum of the leg press (5-RM) and seated leg curl (5-RM), and handgrip strength. Women presented a moderate to strong correlation between femoral neck BMC and 5-RM (r = 0.819), 5-RM (r = 0.879), knee extensors peak torque (r = 0.699), and handgrip strength (r = 0.663), as well as between lumbar spine BMC and the 5-RM test (r = 0.845) and manual grip strength (r = 0.699). For females, the 5-RM and 5-RM tests most fully explained femoral neck BMC (R = 0.859) and the 5-RM test and body mass explained lumbar spine density (R = 0.757) for females. Men did not present correlations between BMC and strength variables. For females, the 5-RM and 5-RM variables explained the variations of femoral neck BMC, while 5-RM and body mass explained lumbar spine BMC. Future studies should evaluate a larger sample size and prioritize the strength tests with a greater predictive capacity.
这项初步研究的目的是验证哪些肌肉力量测试能更好地解释股骨颈和腰椎的骨矿物质含量（BMC），并建立预测方程来估算股骨颈和腰椎的BMC。29名年龄在56 - 76岁之间的受试者（12名女性和17名男性）参与了该研究。通过双能X线吸收法（DXA）评估股骨颈和腰椎的BMC。肌肉力量测量包括膝伸肌和屈肌的最大等长自主收缩、垂直跳、腿举5次最大重复量（5 - RM）和坐姿腿弯举5次最大重复量（5 - RM）以及握力。女性的股骨颈BMC与腿举5 - RM（r = 0.819）、坐姿腿弯举5 - RM（r = 0.879）、膝伸肌峰值扭矩（r = 0.699）和握力（r = 0.663）之间呈现中度至强相关性，腰椎BMC与腿举5 - RM测试（r = 0.845）和手动握力（r = 0.699）之间也呈现中度至强相关性。对于女性，腿举5 - RM和坐姿腿弯举5 - RM测试最能充分解释股骨颈BMC（R = 0.859），腿举5 - RM测试和体重解释了女性腰椎密度（R = 0.757）。男性的BMC与力量变量之间没有相关性。对于女性，腿举5 - RM和坐姿腿弯举5 - RM变量解释了股骨颈BMC的变化，而腿举5 - RM和体重解释了腰椎BMC的变化。未来的研究应评估更大的样本量，并优先选择具有更大预测能力的力量测试。
