Estimates of voluntary activation in individuals with anterior cruciate ligament reconstruction:Effects of type of stimulator,number of stimuli,and quantification technique  

作　　者：Steven A.Garcia Kazandra M.Rodriguez Scott R.Brown Riann M.Palmieri-Smith Chandramouli Krishnan 

机构地区：[1]School of Kinesiology,University of Michigan,Ann Arbor,MI 48109,USA [2]Neuromuscular and Rehabilitation Robotics Laboratory(NeuRRo Lab),Department of Physical Medicine and Rehabilitation,University of Michigan,Ann Arbor,MI 48108,USA [3]Department of Orthopaedic Surgery,Michigan Medicine,University of Michigan,Ann Arbor,MI 48109,USA [4]Robotics Institute,University of Michigan,Ann Arbor,MI 48109,USA

出　　处：《Journal of Sport and Health Science》2022年第1期85-93,共9页运动与健康科学（英文）

基　　金：partly supported by the National Institute of Child Health and Human Development of the National Institutes of Health(Grant No.R21 HD092614)。

摘　　要：Background:Accurate quantification of voluntary activation is important for understanding the extent of quadriceps dysfunction in individuals with anterior cruciate ligament reconstruction(ACLR).Voluntary activation has been quantified using both percent activation derived from the interpolated twitch technique and central activation ratio(CAR)derived from the burst superimposition technique,as well as by using different types of electrical stimulators and pulse train conditions.However,it is unclear how these parameters affect voluntary activation estimates in individuals with ACLR.This study was performed to fill this important knowledge gap in the anterior cruciate ligament literature.Methods:Quadriceps strength and voluntary activation were examined in 18 ACLR participants(12 quadriceps/patellartendon graft,6 hamstring tendon graft;time since ACLR:1.06±0.82 years,mean±SD)at 90°of knee flexion using 2 stimulators(Digitimer and Grass)and pulse train conditions(3-pulse and 10-pulse).Voluntary activation was quantified by calculating both CAR and percent activation.Results:Results indicated that voluntary activation was significantly overestimated by CAR when compared with percent activation(p<0.001).Voluntary activation estimates were not affected by pulse train conditions when using percent activation;however,3-pulse stimuli resulted in greater overestimation than 10-pulse stimuli when using CAR(p=0.003).Voluntary activation did not differ between stimulators(p>0.05);however,the Digitimer evoked greater torque at rest than the Grass(p<0.001).Conclusion:These results indicate that percent activation derived from the interpolated twitch technique provides superior estimates of voluntary activation than CAR derived from burst superimposition and is less affected by pulse train conditions or stimulators in individuals with ACLR.

关 键 词：Anterior cruciate ligament Central activation Inhibition Knee strength TRIPLET Twitch interpolation 

分 类 号：R687.4[医药卫生—骨科学]