Correlation Between Eccentric Training and Functional Tests in Subjects With Reconstructed Acl

Abstract

Introduction: Eccentric training and jump tests are widely used to recover and measure deficits in knee strength and functionality after anterior cruciate ligament (ACL) reconstruction. Objective: To correlate knee extension and flexion torque generated by eccentric isokinetic training, with functional jump tests in subjects with reconstructed ACL. Method: Sixteen men with unilateral ACL reconstruction were assessed before and after 12 weeks of eccentric isokinetic training of knee flexors and extensors (3×10 MVC, 2x/week) at 30°/s for extension and flexion torque (isometric; concentric and eccentric at 30 and 120°/s) and functional jump tests (single, triple, cross and figure of 8). Inter- and intra-limb pre- and post-training mean peak torque (MPT), distance and jump test times were compared along with the correlations between these variables, considering P<0.05. Results: The affected limb (AL) showed significant gain of extension and flexion torque (P<0.01) in the different test categories and velocities evaluated. In the non-affected limb (NAL), this only occurred in the eccentric category (30 and 120°/s), in the extension (P<0.01) and flexion (P<0.05 and P<0.01) torques, respectively. In the jumps, there was an increase in distance (single and triple; P<0.05) and a decrease in time (crossed and figure of 8; P<0.01), however, MPT x Jump correlations were weak (r<0.3) in the pre and post-training period in both limbs. Conclusion: Despite the gain in knee extension and flexion torque and jumping performance, the expected correlation was not satisfactory, suggesting that knee functionality involves other variables inherent to motor control. Level of Evidence IV; Type of study: Case series.

Is resistance training intensity adequately prescribed to meet the demands of returning to sport following anterior cruciate ligament repair? A systematic review

“… 28–30 32 36–38 Bieler et al 30 reported 98% (±4) LSI of the injured leg extensor power in the high-intensity RT group in comparison to 84% (±3) LSI in the low-intensity RT group following the intervention period (20 weeks post-ACLR), a statistically significant difference. Santos et al 38 assessed the subjects between 2 and 5 years post-ACLR and reported 111% and 128% quadriceps and hamstring LSIs, respectively, following the intervention, the highest among the included studies.…”

“…Intervention duration ranged from 6 to 41 weeks; participants completed two to three sessions per week. Interventions commenced between 1 and 12 weeks postoperatively, except Santos et al 38 who included participants between 2 and 5 years following ACLR. The majority of intervention periods were 12 weeks or greater in duration (n=8).…”

“…Santos et al 38 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 0 1 0 0 0 0 1 0 1 14 Welling et al 36 1 1 1 1 1 1 1 0 1 1 0 0 1 0 0 1 0 1 0 1 1 0 0 0 0 0 1 15 copyright. Open access hamstring tendon, quadriceps tendon or patella tendon graft ACLR were represented across studies.…”

“…The majority of intervention periods were 12 weeks or greater in duration (n=8). 28-31 33-36 38 Fukuda et al, 28 Risberg et al 32 and Welling et al 36 represent the most complete rehabilitation protocols of included studies. Interventions commenced 1-2 weeks post-ACLR and were 25 weeks, 6 months and 10 months in duration, respectively.…”