Electromyographic Analysis of Lower Extremity for Volleyball Players with Ankle Instability during Cross Net Blocking

2012 ◽  
Vol 14 (1) ◽  
Keyword(s):  
Lower Extremity ◽  
Ankle Instability ◽  
Volleyball Players ◽  
Electromyographic Analysis

Do Single-Leg Balance Control and Lower Extremity Muscle Strength Correlate with Ankle Instability and Leg Injuries in Young Ballet Dancers?

2021 ◽  
Author(s):  
You-jou Hung ◽  
Jenna Boehm ◽  
Morgan Reynolds ◽  
Kallee Whitehead ◽  
Kaylyn Leland
Keyword(s):  
Muscle Strength ◽  
Lower Extremity ◽  
Ankle Instability ◽  
Balance Control ◽  
Functional Ankle Instability ◽  
Lower Extremity Injuries ◽  
Ballet Dancers ◽  
Leg Injuries ◽  
Lower Extremity Muscle ◽  
Extremity Injuries

Ankle injuries are common among young ballet dancers. These injuries may be attributed to ankle instability, insufficient lower extremity strength, and poor balance control. The purpose of this study was to explore whether these dancers exhibit functional ankle instability and if their single-leg balance control and lower extremity muscle strength correlate with functional ankle instability and leg injuries. Twenty-one ballet dancers (aged 10 to 17 years) participated in the study. The Cumberland Ankle Instability Tool (CAIT) questionnaire was used to examine functional ankle stability. Isometric muscle strength of the major lower extremity muscles was measured with a digital hand-held dynamometer. Single-leg balance was evaluated with the Y-Balance Test (YBT) and three Athletic Single-leg Stability Test (ASLST) protocols. Lower extremity injuries (self-reported) within 6 months after testing were recorded for correlation analyses. Both dominant and non-dominant ankles of the subjects exhibited functional ankle instability (26.71 and 25.71, respectively). Raising the center of mass (passé and first arm position) during the ASLST did not significantly affect balance performance (p = 0.104). However, removing extrinsic visual feedback significantly decreased single-leg balance (p < 0.001). In general, there was low correlation (r ≤ 0.49) between muscle strength, CAIT, YBT, and ASLST scores with lower extremity injuries. It is concluded that for young ballet dancers lower extremity muscle strength and single-leg balance control may not be strong contributing factors to leg injuries. This study also suggests that functional ankle stability may not have a direct impact on single-leg balance, and ballet dancers rely heavily on extrinsic visual feedback for single-leg balance control. Teachers might consider minimizing extrinsic feedback to challenge ballet dancers when implementing training protocols for single-leg balance control.

Altered Lower Extremity Joint Energetic Patterns in Patients with Chronic Ankle Instability during Walking

2017 ◽  
Vol 49 (5S) ◽  
pp. 745
Author(s):  
Trevor Fuhriman ◽  
Hyunsoo Kim ◽  
S. Jun Son ◽  
Jake Roush ◽  
Matthew K. Seeley ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Ankle Instability ◽  
Chronic Ankle Instability

Lower-Extremity Motor Synergies in Individuals With and Without Chronic Ankle Instability

2020 ◽  
Vol 36 (6) ◽  
pp. 416-422
Author(s):  
Adam E. Jagodinsky ◽  
Rebecca Angles ◽  
Christopher Wilburn ◽  
Wendi H. Weimar
Keyword(s):  
Lower Extremity ◽  
Stance Phase ◽  
Ankle Instability ◽  
Theoretical Models ◽  
Chronic Ankle Instability ◽  
Healthy Individuals ◽  
Motor Synergies ◽  
Load Response ◽  
Motor Synergy ◽  
The Moment

Current theoretical models suggest that ankle sprain copers exhibit movement adaptations contributing to the avoidance of chronic ankle instability. However, few studies have examined adaptations at the level of biomechanical motor synergies. The purpose was to examine characteristics of the support moment synergy between individuals with chronic ankle instability, copers, and healthy individuals. A total of 48 individuals participated in the study. Lower-extremity kinetics and variability in the moment of force patterns were assessed during the stance phase of walking trials. The copers exhibited reductions in the support moment during the load response and preswing phase compared with the chronic ankle instability group, as well as during the terminal stance and preswing phase compared the healthy group. The copers also exhibited reductions in the hip extensor moment and ankle plantarflexion moment compared with healthy and chronic ankle instability groups during intervals of stance phase. Variability of the support moment and knee moment was greater in the copers compared with the chronic ankle instability group. Dampening of the support moment and select joint moments exhibited by the copers may indicate an adaptive mechanism to mitigate loading perturbations on the previously injured ankle. Heightened motor variability in copers may be indicative of a more adaptable motor synergy compared with individuals with chronic ankle instability.

Landing Kinematics and Isometric Hip Strength of Individuals With Chronic Ankle Instability

2019 ◽  
Vol 40 (8) ◽  
pp. 969-977 ◽  
Author(s):  
Ryan S. McCann ◽  
Masafumi Terada ◽  
Kyle B. Kosik ◽  
Phillip A. Gribble
Keyword(s):  
Lower Extremity ◽  
Ankle Instability ◽  
External Rotation ◽  
Peak Torque ◽  
Chronic Ankle Instability ◽  
Initial Contact ◽  
Level Of Evidence ◽  
Hip Strength ◽  
Hip Kinematics ◽  
Rotation Strength

Background: Chronic ankle instability (CAI) is associated with hip strength deficits and altered movement in the lower extremity. However, it remains unclear how hip strength deficits contribute to lateral ankle sprain (LAS) mechanisms. We aimed to compare lower extremity landing kinematics and isometric hip strength between individuals with and without CAI and examine associations between hip kinematics and strength. Methods: Seventy-six individuals completed 5 single-leg landings, during which we collected three-dimensional ankle, knee, and hip kinematics from 200 milliseconds pre–initial contact to 50 milliseconds post–initial contact. We calculated average peak torque (Nm/kg) from 3 trials of isometric hip extension, abduction, and external rotation strength testing. One-way analyses of variance assessed group differences (CAI, LAS coper, and control) in hip strength and kinematics. Pearson product moment correlations assessed associations between hip kinematics and strength. We adjusted the kinematic group comparisons and correlation analyses for multiple comparisons using the Benjamini-Hochberg method. Results: The CAI group exhibited less hip abduction during landing than LAS copers and controls. The CAI group had lower hip external rotation strength than LAS copers ( P = .04, d = 0.62 [0.05, 1.17]) and controls ( P < .01, d = 0.87 [0.28, 1.43]). Effect sizes suggest that the CAI group had deficits in EXT compared with controls ( d = 0.63 [0.06, 1.19]). Hip strength was not associated with hip landing kinematics for any group. Conclusion: Altered landing mechanics displayed by the CAI group may promote mechanisms of LAS, but they are not associated with isometric hip strength. However, hip strength deficits may negatively impact other functional tasks, and they should still be considered during rehabilitation. Level of Evidence: Level III, case-control study.

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