Analyses of Isokinetic Thigh Muscle Strength: Camera-Based Assessment Alters the Magnitude, but Not the Message

Alt, Tobias; Nolte, Kevin; Horn, Dennis; Modenbach, Dominik; Knicker, Axel; Jaitner, Thomas

doi:10.1080/02701367.2022.2053648

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…[48] It is to note that the results from our discrete testing might not be transferable to other test settings for example reciprocal tests. [50] The present study identi ed characteristics and measures of quadriceps and hamstring strength that discriminate between athletes post ACL reconstruction and healthy controls with a multifactorial approach. Therefore, our ndings can be further investigated and used as hypotheses in future longitudinal RTS studies and hopefully provide bene t to making more nuanced and robust RTS decisions.…”

Section: Limitations Andmentioning

confidence: 99%

Finding the needle in the haystack of isokinetic knee data: Random Forest modelling improves return-to-sport information

Nolte

Gerharz

Jaitner

et al. 2023

Preprint

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Background: The difficulties of rehabilitation after anterior cruciate ligament (ACL) injuries, subsequent return-to-sport (RTS) let alone achieving pre-injury performance are well known. Isokinetic testing is often used to assess strength capacities during that process. The aim of the present applied machine learning (ML) approach was to examine which isokinetic data differentiates athletes post ACL reconstruction and healthy controls. Data from unilateral concentric and eccentric knee flexor and extensor tests (30°/s, 150°/s) was used to train Random Forest models from 366 male (63 post ACL reconstruction) and 183 female (72 post ACL reconstruction) athletes. Via a cross validation predictive performance was evaluated and accumulated local effects plots analysed the features of the models. Results: Random Forest showed outstanding predictive performance for male (AUC=0.90, sensitivity=0.76, specificity=0.88) and female (AUC=0.92, sensitivity=0.85, specificity=0.89) athletes. For both male and female athletes, the ten most impactful features on the predictive likelihood of the model either referred to the disadvantageous (injured, non-dominant in control group) leg or to lateral differences. The eccentric hamstring work at 150°/s was identified as the most impactful single parameter. Conclusion: A ML model trained with parameters from isokinetic knee data discriminated between athletes 6 to 24 months post ACL reconstruction and healthy athletes with high accuracy. We see potential for improving RTS decision making by incorporating and combining measures, which focus on hamstring strength, leg symmetry and contractional work.

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Section: Limitations Andmentioning

confidence: 99%

Finding the needle in the haystack of isokinetic knee data: Random Forest modelling improves return-to-sport information

Nolte

Gerharz

Jaitner

et al. 2023

Preprint

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“…Football is one of the sports considered suitable for the study of hip, knee and ankle joints, as the parameters of the lower limb region are the structures in which performance should be focussed. Therefore, the effects of football players on isokinetic strength, endurance and body balance are studied acutely after warm-up (Alt et al, 2022;Ithurburn et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Acute Effect of Proprioceptive Neuromuscular Facilitation - Based Warm-Up on Isokinetic Strength, Endurance and Balance

YILDIZ,

ÇEBİ

2024

Preprint

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This study investigated the acute effects of proprioceptive neuromuscular facilitation (PNF)-based warm-up on isokinetic strength, endurance, and body balance in 50 soccer players. Measurements were taken on four separate days, with participants resting completely between sessions. Isokinetic strength tests for hip, knee, and ankle flexion and extension were conducted using an isokinetic dynamometer at angular velocities of 60o/sec, 180o/sec and 240o/sec. Endurance was assessed with 25 repetitions at 240o/sec by analyzing the change in peak torque values. On the first day, players underwent general warm-up, balance tests, and isokinetic strength measurements. Subsequent sessions included these measurements along with additional testing. Results showed that the PNF-based warm-up significantly improved static and dynamic balance compared to other methods (p<,001). Peak torque values at all angular velocities indicated that the PNF-based warm-up was more effective than other warm-ups. Additionally, PNF-based warm-up had a better acute effect on knee joint isokinetic endurance (p<,05). In conclusion, the PNF-based warm-up significantly enhanced static and dynamic balance, isokinetic strength, and endurance in soccer players. It is recommended to include PNF-based warm-ups in soccer training, especially for the lower extremities, and to consider combining it with active warm-up methods for optimal acute performance benefits.

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Effects of Test Modality and Hip Flexion on Resultant Knee Flexor Moments

Alt¹,

Nolte

Horn

et al. 2023

Advances in Intelligent Systems and Computing

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Analyses of Isokinetic Thigh Muscle Strength: Camera-Based Assessment Alters the Magnitude, but Not the Message

Cited by 7 publications

References 24 publications

Finding the needle in the haystack of isokinetic knee data: Random Forest modelling improves return-to-sport information

Finding the needle in the haystack of isokinetic knee data: Random Forest modelling improves return-to-sport information

Acute Effect of Proprioceptive Neuromuscular Facilitation - Based Warm-Up on Isokinetic Strength, Endurance and Balance

Effects of Test Modality and Hip Flexion on Resultant Knee Flexor Moments

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