Influence of Core Musculature Engagement on Knee Kinematics of Females During a Single Leg Squat

Shirey, Matthew; Hurlbutt, Matthew; Johansen, Nicole; Wilkinson, Steven G.; King, Gregory W.; Hoover, Don

doi:10.1249/01.mss.0000401382.61642.9c

Cited by 28 publications

(45 citation statements)

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“…In addition, we examined differences in these measures between drop vertical-jump activities from 0.30-and 0.50-m heights. Our results partially supported our hypothesis that VPAC would improve neuromuscular and biomechanical measures related to ACL injury and add to the growing body of evidence 26,27 that increased proximal stability induced by a VPAC strategy potentially improves the neuromuscular control of more distal segments during dynamic activities. In addition, our prediction that lower extremity EMG and kinematic and kinetic variables would differ between landing heights was supported.…”

Section: Discussionsupporting

confidence: 85%

“…For example, investigators 26 have demonstrated that preventive sensorimotor control programs that include lumbar-stabilization exercises reduce ACL injury risk in athletes. In addition, Shirey et al 27 found that a nonquantified VPAC activity decreased bilateral frontal-plane hip displacement and increased stance-limb knee flexion during a 6-in (15.24-cm) step descent. Furthermore, transversus abdominis activation increased gluteus maximus (GM) and medial hamstrings muscle activity and decreased anterior pelvic tilt during prone active hip extension.…”

mentioning

confidence: 99%

“…If VPAC improves landing technique, incorporating this maneuver during athletic and industrial tasks that increase the risk for lower extremity injury may help reduce that risk. 27 An effect size index of f ¼ 0.50 was estimated. With a desired power of 80% (1 À b ¼ 0.80) and an a level of .05, this effect size index required a minimum sample size of 28.…”

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confidence: 99%

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Volitional Spine Stabilization During a Drop Vertical Jump From Different Landing Heights: Implications for Anterior Cruciate Ligament Injury

Haddas

Hooper

James

et al. 2016

Journal of Athletic Training

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Context: Volitional preemptive abdominal contraction (VPAC) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear.Objective: To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights.Design: Controlled laboratory study. Intervention(s): Core-muscle activation using VPAC. Main Outcome Measure(s): We collected 3-dimensional ankle, knee, and hip motions, moments, and powers; ground reaction forces; and trunk and lower extremity muscle activity during 0.30-and 0.50-m drop vertical-jump landings.Results: During landing from a 0.30-m height, VPAC performance increased external oblique and semitendinosis activity, knee flexion, and knee internal rotation and decreased knee-abduction moment and knee-energy absorption. During the 0.50-m landing, the VPAC increased external oblique and semitendinosis activity, knee flexion, and hip flexion and decreased ankle inversion and hip-energy absorption.Conclusions: The VPAC performance during landing may protect the anterior cruciate ligament during different landing phases from different heights, creating a protective advantage just before ground contact and after the impact phase. Incorporating VPAC during high injury-risk activities may enhance pelvic stability, improve lower extremity positioning and sensorimotor control, and reduce anterior cruciate ligament injury risk while protecting the lumbar spine.Key Words: clinical biomechanics, core stabilization, rehabilitation Key PointsUsing a volitional preemptive abdominal contraction strategy during 0.30-and 0.50-m drop vertical-jump landings may decrease exposure to biomechanical factors contributing to anterior cruciate ligament injury. Selected benefits were greater during the 0.30-m than during the 0.50-m drop vertical jump, possibly due to increased external loads associated with the greater height. Individuals can be trained to incorporate volitional preemptive abdominal contraction during functional, closed chain activities in a controlled laboratory setting to enhance pelvic stability, improve lower extremity sensorimotor control and positioning, and reduce biomechanical factors associated with anterior cruciate ligament injury while protecting the lumbar spine.

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Section: Discussionsupporting

confidence: 85%

mentioning

confidence: 99%

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Volitional Spine Stabilization During a Drop Vertical Jump From Different Landing Heights: Implications for Anterior Cruciate Ligament Injury

Haddas

Hooper

James

et al. 2016

Journal of Athletic Training

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“…During functional activities especially landing, the range of knee motion most likely offers better functions [45,46]. Previous studies confirm that the core feed forward muscles are employed before distal muscles [47]. As an example Hodges et al made efforts to demonstrate that the trunk muscles activities are prior to limb muscles, while this state cannot be correct for subjects with disabilities [48,49].…”

Section: Discussionmentioning

confidence: 99%

Can eight weeks of stabilization exercise change the amount of knee flexion and anterior shear force?

Fatahi¹,

Ghasemi²,

Karimi³

et al. 2018

Ann Clin Anal Med

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Aim: This study aimed to evaluate the effect of eight-week stabilization training on knee flexion and anterior shear force during a single leg drop landing to prevent ACL injury. Material and Method: Thirty basketball athletes were randomly assigned to a training group (n = 15) and a control group (n = 15). Training group performed the Core stability training for 8 weeks, but control group did not perform these exercises. Lower extremity kinetics and kinematics variables during single-leg drop landing were collected by motion analysis and force plate in pre and post-test. Data were analyzed by using mixed ANOVA repeated measure test with significance level of P≤0.05. Results: The results showed that the amount of knee flexion significantly increased after conducting the 8 weeks of core stability training (P< 0.05), while there was no significant decrease in anterior shear forces (P> 0.05). Discussion: Based on the results, the core stability training by increasing the core stability can improve the core muscles recruitment during landing. Therefore, it can be concluded that core stability training can reduce the ACL injury risks during the dynamic movements.

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“…Clinically, there is a perception that LPS is an essential component of injury prevention, and training LPS is thought to aid recovery from injury and improve performance 2 . Deficits in LPS have been associated with injury or pain in the back, groin and knee 3Á10 and exercise for the lumbopelvic region can reduce the risk of muscle strain injury 11 and improve the gold standard quantitative measure of movement: three dimensional kinematics 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Internet and smartphone delivery of core trunk exercises for a randomised clinical trial: protocol

2014

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Ms. Perrott is the recipient of a research scholarship from La Trobe University for her PhD program Background: Lumbopelvic stability exercises are commonly prescribed for athletes to prevent sports injury; however, there is limited evidence that exercises are effective. Exercise trials are time consuming and costly to implement when teaching exercises or providing feedback directly to participants. Delivery of exercise programs using mobile technology potentially overcomes these difficulties.Aims: To evaluate the qualitative clinical changes and quantitative movement pattern changes on lumbopelvic stability and injury in recreational athletes following exercise. It is hypothesised that athletes who complete the stability training program will improve their clinical rating of lumbopelvic stability, quantitatively improve their movement patterns and have fewer injuries compared to those who complete the stretching program.Methods: One hundred and fifty recreational athletes will be recruited for the trial. Direct contact with researchers will be limited to three movement test sessions at baseline, 12 weeks and 12 months after baseline. Videoed performance of the tests will be accessed from an internet data storage site by researchers for clinical evaluation of lumbopelvic stability. Those without good stability at baseline will be randomly allocated to one of two exercise groups. The exercise programs will be delivered via the internet. Feedback on correct performance of the exercises will be provided using a smartphone software application. Injury will be monitored weekly for 12 months using text messages. Conclusion:The trial protocol will establish if an exercise training program improves lumbopelvic stability and reduces injury. Improvement in lumbopelvic stability following an exercise program delivered with mobile technology will enable the provision of exercise programs to other athletes who may be geographically remote from their exercise provider and establish a method for researchers and health professions to use for exercise programs for individuals with other health conditions.

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Influence of Core Musculature Engagement on Knee Kinematics of Females During a Single Leg Squat

Cited by 28 publications

References 0 publications

Volitional Spine Stabilization During a Drop Vertical Jump From Different Landing Heights: Implications for Anterior Cruciate Ligament Injury

Volitional Spine Stabilization During a Drop Vertical Jump From Different Landing Heights: Implications for Anterior Cruciate Ligament Injury

Can eight weeks of stabilization exercise change the amount of knee flexion and anterior shear force?

Internet and smartphone delivery of core trunk exercises for a randomised clinical trial: protocol

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