Force Sense of the Knee Not Affected by Fatiguing the Knee Extensors and Flexors

Katelyn F. Allison*, Timothy C. Sell, Anne Benjaminse, Scott M. Lephart

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    7 Citations (Scopus)

    Abstract

    Context: Knee injuries commonly occur in later stages of competition, indicating that fatigue may influence dynamic knee stability. Force sense (FS) is a submodality of proprioception influenced by muscle mechanoreceptors, which, if negatively affected by fatigue, may result in less-effective neuromuscular control. Objectives: To determine the effects of peripheral fatigue on FS of the quadriceps and hamstrings. Design: Quasi-experimental study design. Participants: 20 healthy and physically active women and men (age 23.4 +/- 2.7 y, mass 69.5 +/- 10.9 kg, height 169.7 +/- 9.4 cm). Interventions: Fatigue was induced during a protocol with 2 sets of 40 repetitions, and the last set was truncated at 90 repetitions or stopped if torque production dropped below 25% of peak torque. Main Outcome Measures: FS of the hamstrings and quadriceps was tested on separate days before and after 3 sets of isokinetic knee flexion and extension to fatigue by examining the ability to produce a target isometric torque (15% MVIC) with and without visual feedback (FS error). Electromyographic data of the tested musculature were collected to calculate and determine median frequency shift. T tests and Wilcoxon signed-rank tests were conducted to examine prefatigue and postfatigue FS error for flexion and extension. Results: Despite verification of fatigue via torque-production decrement and shift in median frequency, no significant differences were observed in FS error for either knee flexion (pre 0.54 +/- 2.28 N.m, post 0.47 +/- 1.62 N.m) or extension (pre -0.28 +/- 2.69 N.m, post -0.21 +/- 1.78 N.m) prefatigue compared with the postfatigue condition. Conclusions: Although previous research has demonstrated that peripheral fatigue negatively affects threshold to detect passive motion (TTDPM), it did not affect FS as measured in this study. The peripheral-fatigue protocol may have a greater effect on the mechanoreceptors responsible for TTDPM than those responsible for FS. Further investigation into the effects of fatigue across various modes of proprioception is warranted.

    Original languageEnglish
    Pages (from-to)155-163
    Number of pages9
    JournalJournal of sport rehabilitation
    Volume25
    Issue number2
    DOIs
    Publication statusPublished - May-2016

    Keywords

    • proprioception
    • sensorimotor
    • neuromuscular
    • lower extremity
    • LOWER-EXTREMITY KINEMATICS
    • INJURY SURVEILLANCE SYSTEM
    • FUNCTIONAL JOINT STABILITY
    • AMATEUR RUGBY LEAGUE
    • MUSCULAR FATIGUE
    • SENSORIMOTOR SYSTEM
    • GENDER-DIFFERENCES
    • LIGAMENT INJURIES
    • POSITION SENSE
    • DESCRIPTIVE EPIDEMIOLOGY

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