TY - JOUR
T1 - Paradoxical relationship in sensorimotor system
T2 - Knee joint position sense absolute error and joint stiffness measures
AU - Nagai, Takashi
AU - Bates, Nathaniel A.
AU - Hewett, Timothy E.
AU - Schilaty, Nathan D.
N1 - Funding Information:
The authors would like to thank the subjects for their willingness to participate in the study. We acknowledge funding from the National Institute of Arthritis and Musculoskeletal and Skin Diseases : R01AR056259 and R01AR055563 to TEH and L30AR070273 to NDS, and from the National Institute of Child Health and Human Development : K12HD065987 to NDS. This work was also supported by the Kelly Orthopedic Fellowship, Mayo Clinic .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/7
Y1 - 2019/7
N2 - Background: Relationships between joint position sense and the sensorimotor characteristics such as joint stiffness, time to detect motion, and time to peak torque during a perturbation test have rarely been investigated due to methodological challenges. The purpose of this study was to compare joint position sense and the sensorimotor characteristics in healthy individuals. Methods: A total of 26 subjects were recruited and completed joint position sense and a perturbation test on isokinetic dynamometer. Joint position sense was assessed by comparison of the absolute angle difference between a reference and replicated position. During the perturbation test, the dynamometer moved the knee flexion angle from 70° to 30° (0° represents a full knee extension) at the velocity of 500° per second at random. Subjects were asked to react and pull back the leg as soon as they perceived the movement. Pearson or Spearman's correlation coefficients were used to assess these relationships (P < 0.05). Findings: Larger joint position sense absolute error values were significantly correlated with higher short-range at 50 milliseconds (r = 0.572, P = 0.002), at 100 milliseconds (ρ = 0.416, P = 0.035), and reactive joint stiffness (r = 0.395, P = 0.046). Interpretation: There was a paradoxical relationship between higher joint stiffness and worsened joint position sense. Potential reasons include sensory weighting within the sensorimotor system and thixotropic properties (after-effects of muscle eccentric contractions to increase stiffness and alter joint position sense).
AB - Background: Relationships between joint position sense and the sensorimotor characteristics such as joint stiffness, time to detect motion, and time to peak torque during a perturbation test have rarely been investigated due to methodological challenges. The purpose of this study was to compare joint position sense and the sensorimotor characteristics in healthy individuals. Methods: A total of 26 subjects were recruited and completed joint position sense and a perturbation test on isokinetic dynamometer. Joint position sense was assessed by comparison of the absolute angle difference between a reference and replicated position. During the perturbation test, the dynamometer moved the knee flexion angle from 70° to 30° (0° represents a full knee extension) at the velocity of 500° per second at random. Subjects were asked to react and pull back the leg as soon as they perceived the movement. Pearson or Spearman's correlation coefficients were used to assess these relationships (P < 0.05). Findings: Larger joint position sense absolute error values were significantly correlated with higher short-range at 50 milliseconds (r = 0.572, P = 0.002), at 100 milliseconds (ρ = 0.416, P = 0.035), and reactive joint stiffness (r = 0.395, P = 0.046). Interpretation: There was a paradoxical relationship between higher joint stiffness and worsened joint position sense. Potential reasons include sensory weighting within the sensorimotor system and thixotropic properties (after-effects of muscle eccentric contractions to increase stiffness and alter joint position sense).
KW - Joint position sense
KW - Paradoxical relationship
KW - Sensorimotor system
KW - Stiffness
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U2 - 10.1016/j.clinbiomech.2019.04.021
DO - 10.1016/j.clinbiomech.2019.04.021
M3 - Article
C2 - 31071536
AN - SCOPUS:85065035504
SN - 0268-0033
VL - 67
SP - 34
EP - 37
JO - Clinical Biomechanics
JF - Clinical Biomechanics
ER -