Herrington, Lee

Relph, Nicola

25th Congress of the International Society of Bio mechanics. The hosts for the conference were the Biomedical Engineering Department of the University of Strathclyde in Glasgow

Edge Hill University Research Information Repository

ISB 2015InjuryISB 2015-155THE EFFECT OF PERIPHERAL FATIGUE ON KNEE JOINT POSITION SENSE.N S Relph* 1, L C  Herrington21University of Cumbria, Carlisle, 2University of Salford, Salford, United KingdomPreferred Presentation: Poster PresentationClinical Biomechanics Award: YesDavid Winter Young Investigator Awards: YesDavid Winter Award - presentation Preference: PosterEmerging Scientific Award sponsored by Professor J De Luca: NoPromising Scientist Award sponsored by Motion Analysis: NoIntroduction and Objectives: Muscular fatigue is the inability to maintain a power output or force during repeatedmuscular contractions due to changes in physiological processes. Joint position sense (JPS) is the awareness of positionin space. Exercising when fatigued increases the risk of injury, which may be due to a reduction in knee position sense.Indeed, evidence suggests more injuries occur in the final third of sports matches than in earlier periods. The aim of thisstudy was to measure the effect of peripheral muscular fatigue on knee JPS.Methods: 20 healthy participants provided informed consent. Knee JPS was recorded before and after a fatiguingprotocol. The JPS measurements were taken using a previously validated method (Relph and Herrington, 2014a, 2014b).This involved open chain, passive-active reproduction of a target angle into both flexion and extension. Absolute errorscores (AES) were taken as the absolute difference between target and reproduction angles. Angles were measuredusing image capture and manual digitising techniques. Fatiguing protocol was conducted on an isokinetic dynamometerand involved concentrically extensions and flexions of the dominant knee maximally at 60°/s until they reached 50% oftheir maximum voluntary contraction on three consecutive trials in both flexor and extensor muscle groups.Results: The mean (±SD) maximum voluntary contraction into knee flexion and extension was 78.7N.m (±22.8) and177.1N.m (±39.0) respectively. Results of the analysis revealed no effect of the fatiguing protocol on either JPS flexion(p=0.729) or JPS extension (p=0.492). Knee JPS flexion error scores reduced by 0.17° and JPS extension error scoresreduced by 0.14°. Discussion - One viable explanation of the results of this study is the fatiguing protocol was not severeenough to induce a fatigued state. For example the anterior shear loads imposed on the knee joint during isokineticcontraction at 180°/s are equivocal to that of walking and compressive loads equivalent to stair climbing. This suggestsstudies using isokinetic fatiguing may not create representative fatiguing of the joint as would occur during exercise. Themethod of measuring fatigue levels using 50% of MVC may also have limitations. It may be more appropriate to useblood analysis techniques to confirm fatigue. However, it would appear peripheral fatigue occurred to some extent asMVC performance did reduce. Another explanation for the lack of JPS decline may be compensatory techniques in thecentral nervous system, central processing may have adjusted efferent information to ensure continued to provideaccurate joint position sense.Conclusion: In conclusion, peripheral fatiguing protocols may not induce fatigue to an appropriate level to illustrate theeffects on knee JPS. Alternatively, knee JPS may not be affected by fatigue and hence a reduction in knee staticproprioception may not be a mechanism of the increased risk of injury during the latter stage of exercise and sport.Future research should consider the effect of central fatiguing on knee proprioception. Disclosure -This data is new andhas not been submitted elsewhere.References: Reference 1Relph et al. (2014a). Inter-Examiner, Intra-Examiner and Test-Retest Reliability of Clinical Knee Joint Position SenseMeasurements Using an Image Capture Technique. J. Sport Rehabil., In Press.Reference 2Relph et al. (2014b). Criterion-Related Validity of Knee Joint Position Sense Measurement Using Image Capture andIsokinetic Dynamometry. J. Sport Rehabil., In Press. Disclosure of Interest: None Declared

The Effect of Peripheral Fatigue on Knee Joint Position Sense.

https://research.edgehill.ac.uk/ws/files/20103386/ISB_2015.pdf

The Effect of Peripheral Fatigue on Knee Joint Position Sense.

Abstract

Similar works

Full text

Available Versions

Edge Hill University Research Information Repository