Fischer Felix, Blank Cornelia, Dünnwald Tobias, Gföller Peter, Herbst Elmar, Hoser Christian, Fink Christian
Research Unit of Orthopaedic Sports Medicine and Injury Prevention/Institute for Sports Medicine, Alpine Medicine and Health Tourism/Private University of Health Sciences, Medical Informatics and Technology, Hall in Tirol, Austria.
Institute for Sports Medicine, Alpine Medicine and Health Tourism/Private University of Health Sciences, Medical Informatics and Technology, Hall in Tirol, Austria.
Orthop J Sports Med. 2017 Nov 3;5(11):2325967117736766. doi: 10.1177/2325967117736766. eCollection 2017 Nov.
Isokinetic strength testing is an important tool in the evaluation of the physical capacities of athletes as well as for decision making regarding return to sports after anterior cruciate ligament (ACL) reconstruction in both athletes and the lay population. However, isokinetic testing is time consuming and requires special testing equipment.
A single-jump test, regardless of leg dominance, may provide information regarding knee extension strength through the use of correlation analysis of jump height and peak torque of isokinetic muscle strength.
Cross-sectional study; Level of evidence, 3.
A total of 169 patients who underwent ACL reconstruction were included in this study. Isokinetic testing was performed on the injured and noninjured legs. Additionally, a single-leg countermovement jump was performed to assess jump height using a jump accelerometer sensor. Extension strength values were used to assess the association between isokinetic muscle strength and jump height.
The sample consisted of 60 female (mean age, 20.8 ± 8.3 years; mean weight, 61.7 ± 6.5 kg; mean height, 167.7 ± 5.3 cm) and 109 male (mean age, 23.2 ± 7.7 years; mean weight, 74.6 ± 10.2 kg; mean height, 179.9 ± 6.9 cm) patients. Bivariate correlation analysis showed an association ( = 0.56, < .001) between jump height and isokinetic extension strength on the noninvolved side as well as an association ( = 0.52, < .001) for the involved side. Regression analysis showed that in addition to jump height (beta = 0.49, < .001), sex (beta = -0.17, = .008) and body mass index (beta = 0.37, < .001) affected isokinetic strength. The final model explained 51.1% of the variance in isokinetic muscle strength, with jump height having the strongest impact (beta = 0.49, < .001) and explaining 31.5% of the variance.
Initial analysis showed a strong association between isokinetic strength and jump height. The study population encompassed various backgrounds, skill levels, and activity profiles, which might have affected the outcome. Even after controlling for age and sex, isokinetic strength was still moderately associated with jump height. Therefore, the jump technique and type of sport should be considered in future research.
等速肌力测试是评估运动员身体能力的重要工具，同时对于运动员和普通人群在进行前交叉韧带（ACL）重建术后恢复运动的决策制定也很重要。然而，等速测试耗时且需要特殊的测试设备。
无论优势腿如何，单跳测试通过对跳跃高度与等速肌力峰值扭矩进行相关性分析，可能提供有关膝关节伸展力量的信息。
横断面研究；证据等级，3级。
本研究共纳入169例行ACL重建术的患者。对患侧和健侧腿进行等速测试。此外，使用跳跃加速度传感器进行单腿反向跳跃以评估跳跃高度。伸展力量值用于评估等速肌力与跳跃高度之间的关联。
样本包括60名女性（平均年龄，20.8±8.3岁；平均体重，61.7±6.5kg；平均身高，167.7±5.3cm）和109名男性（平均年龄，23.2±7.7岁；平均体重，74.6±10.2kg；平均身高，179.9±6.9cm）患者。双变量相关性分析显示，非患侧的跳跃高度与等速伸展力量之间存在关联（r = 0.56，P <.001），患侧也存在关联（r = 0.52，P <.001）。回归分析显示，除跳跃高度外（β = 0.49，P <.001），性别（β = -0.17，P =.008）和体重指数（β = 0.37，P <.001）也影响等速肌力。最终模型解释了等速肌力51.1%的方差，其中跳跃高度的影响最强（β = 0.49，P <.001），解释了31.5%的方差。
初步分析显示等速肌力与跳跃高度之间存在密切关联。研究人群涵盖了各种背景、技能水平和活动情况，这可能影响了研究结果。即使在控制年龄和性别后，等速肌力与跳跃高度仍存在中度关联。因此，未来研究应考虑跳跃技术和运动类型。
