Differentiating Successful and Unsuccessful Single-Leg Drop Landing Performance Using Uncontrolled Manifold Analysis

Motor Control ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 75-90
Author(s):  
Christopher A. DiCesare ◽  
Scott Bonnette ◽  
Gregory D. Myer ◽  
Adam W. Kiefer
Keyword(s):  
Task Performance ◽  
Injury Risk ◽  
Motor Coordination ◽  
Center Of Mass ◽  
Frontal Plane ◽  
Female Adolescent ◽  
Biomechanical Analysis ◽  
Uncontrolled Manifold ◽  
Future Research ◽  
Targeted Interventions

Biomechanical analysis can effectively identify factors associated with task performance and injury risk, but often does not account for the interaction among the components that underlie task execution. Uncontrolled manifold (UCM) analyses were applied to data from 38 female, adolescent athletes performing single-leg drop landings and were used to differentiate successful and unsuccessful task performance by examining the frontal plane joint variance within the UCM (VUCM) that stabilized the horizontal center of mass position (VUCM) and within the orthogonal subspace (VORT). The UCM revealed stronger coordination, indicated by the VUCM/VORT ratio, in the successful condition. This may inform future research examining reduced motor coordination in failed movement tasks and its relation to injury risk and allow for targeted interventions that consider coordination processes rather than joint-specific outcomes.

High-Risk Lower-Extremity Biomechanics Evaluated in Simulated Soccer-Specific Virtual Environments

2020 ◽  
Vol 29 (3) ◽  
pp. 294-300 ◽  
Author(s):  
Christopher A. DiCesare ◽  
Adam W. Kiefer ◽  
Scott Bonnette ◽  
Gregory D. Myer
Keyword(s):  
Lower Extremity ◽  
Injury Risk ◽  
Medical Center ◽  
Vertical Jump ◽  
Frontal Plane ◽  
Female Adolescent ◽  
Lower Extremity Injury ◽  
Skill Transfer ◽  
Targeted Interventions ◽  
Drop Vertical Jump

Context: Laboratory-based biomechanical analyses of sport-relevant movements such as landing and cutting have classically been used to quantify kinematic and kinetic factors in the context of injury risk, which are then used to inform targeted interventions designed to improve risky movement patterns during sport. However, the noncontextual nature of standard assessments presents challenges for assessing sport-relevant skill transfer. Objective: To examine injury-risk biomechanical differences exhibited by athletes during a jump-landing task performed as part of both a standard biomechanical assessment and a simulated, sport-specific virtual reality (VR)-based assessment. Design: Observational study. Setting: Medical center laboratory. Participants: Twenty-two female adolescent soccer athletes (age = 16.0 [1.4] y, height = 165.6 [4.9] cm, and weight = 60.2 [11.4] kg). Interventions: The landing performance was analyzed for a drop vertical jump task and a VR-based, soccer-specific corner-kick scenario in which the athletes were required to jump to head a virtual soccer ball and land. Main Outcome Measures: Hip, knee, and ankle joint kinematic differences in the frontal and sagittal planes. Results: Athletes exhibited reduced hip and ankle flexion, hip abduction, and frontal plane ankle excursion during landing in realistic sport scenario compared with the standard drop vertical jump task. Conclusion: VR-based assessments can provide a sport-specific context in which to assess biomechanical deficits that predispose athletes for lower-extremity injury and offer a promising approach to better evaluate skill transfer to sport that can guide future injury prevention efforts.

scholarly journals NEURAL ACTIVITY AND LANDING BIOMECHANICS: EXPLORING THE RELATIONSHIPS BETWEEN THE BRAIN, BODY, AND ACL INJURY-RISK

2021 ◽  
Vol 9 (7_suppl3) ◽  
pp. 2325967121S0015
Author(s):  
Cody R. Criss ◽  
Dustin R. Grooms ◽  
Jed A. Diekfuss ◽  
Manish Anand ◽  
Alexis B. Slutsky-Ganesh ◽  
...  
Keyword(s):  
Neural Activity ◽  
Injury Risk ◽  
Neural Control ◽  
Motor Coordination ◽  
Cruciate Ligament ◽  
Vertical Jump ◽  
Frontal Plane ◽  
Peak Knee ◽  
Knee Abduction ◽  
Drop Vertical Jump

Background: Anterior cruciate ligament (ACL) injuries predominantly occur via non-contact mechanisms, secondary to motor coordination errors resulting in aberrant frontal plane knee loads that exceed the thresholds of ligament integrity. However, central nervous system processing underlying high injury-risk motor coordination errors remain unknown, limiting the optimization of current injury reduction strategies. Purpose: To evaluate the relationships between brain activity during motor tasks with injury-risk loading during a drop vertical jump. Methods: Thirty female high school soccer players (16.10 ± 0.87 years, 165.10 ± 4.64 cm, 63.43 ± 8.80 kg) were evaluated with 3D biomechanics during a standardized drop vertical jump from a 30 cm box and peak knee abduction moment was extracted as the injury-risk variable of interest. A neuroimaging session to capture neural activity (via blood-oxygen-level-dependent signal) was then completed which consisted of 4 blocks of 30 seconds of repeated bilateral leg press action paced to a metronome beat of 1.2 Hz with 30 seconds rest between blocks. Knee abduction moment was evaluated relative to neural activity to identify potential neural contributors to injury-risk. Results: There was a direct relationship between increased landing knee abduction moment and increased neural activation within regions corresponding to the lingual gyrus, intracalcarine cortex, posterior cingulate cortex, and precuneus (r2= 0.68, p corrected < .05, z max > 3.1; Table 1 & Figure 1). Conclusion: Elevated activity in regions that integrate sensory, spatial, and attentional information may contribute to elevated frontal plane knee loads during landing. Interestingly, a similar activation pattern related to high-risk landing mechanics has been found in those following injury, indicating that predisposing factors to injury may be accentuated by injury or that modern rehabilitation does not recover prospective neural control deficits. These data uncover a potentially novel brain marker that could guide the discovery of neural-therapeutic targets that reduce injury risk beyond current prevention methods. [Table: see text][Figure: see text]

scholarly journals The relation between kinematic synergy to stabilize the center of mass during walking and future fall risks: a 1-year longitudinal study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Momoko Yamagata ◽  
Hiroshige Tateuchi ◽  
Itsuroh Shimizu ◽  
Junya Saeki ◽  
Noriaki Ichihashi
Keyword(s):  
Older Adults ◽  
Center Of Mass ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Frontal Plane ◽  
Community Dwelling ◽  
Uncontrolled Manifold ◽  
Whole Body ◽  
Baseline Visit ◽  
Segmental Coordination

Abstract Background Incorrect body weight shifting is a frequent cause of falls, and the control of the whole-body center of mass (CoM) by segmental coordination is essential during walking. Uncontrolled manifold (UCM) analysis is a method of examining the relation between variance in segmental coordination and CoM stability. However, no prospective cohort study has thoroughly investigated how variance in segmental configurations to stabilize the CoM relates to future falls. This study explored whether variance to stabilize the CoM was related to future falls. Methods At the baseline visit, 30 community-dwelling older adults walked 20 times on a 6-m walkway. Using kinematic data collected during walking by a three-dimensional motion capture system, UCM analysis was performed to investigate how segmental configuration contributes to CoM stability in the frontal plane. One year after the baseline visit, we evaluated whether the subjects experienced falls. Twelve subjects had experienced falls, and 16 had not. Comparisons of variance between older adults with and without falls were conducted by covariate analysis. Results No significant differences in variance were found in the mediolateral direction, whereas in the vertical direction, older adults with fall experiences had a greater variance, reflecting an unstable CoM, than those with no fall experiences. Conclusions We verified that the high variance in segmental configurations that destabilize the CoM in the vertical direction was related to future falls. The variables of UCM analysis can be useful for evaluating fall risk.

scholarly journals Perceptual-cognitive Function and Unplanned Athletic Movement Task Performance: A Systematic Review

2020 ◽  
Author(s):  
Jan Wilke ◽  
David Groneberg ◽  
Winfried Banzer ◽  
Florian Giesche
Keyword(s):  
Systematic Review ◽  
Cognitive Function ◽  
Task Performance ◽  
Lower Limb ◽  
Injury Risk ◽  
Literature Search ◽  
Future Research ◽  
Functional Safety ◽  
Study Quality ◽  
Cutting Direction

The performance of choice-reaction tasks during athletic movement has been demonstrated to evoke unfavorable lower limb biomechanics. However, the mechanism of this observation is unknown. We conducted a systematic review examining the association between 1) the biomechanical and functional safety of unplanned sports-related movements (e.g. jumps/runs with spontaneously indicated landing leg/cutting direction) and 2) markers of perceptual-cognitive function (PGF). A literature search in three databases (Pubmed, ScienceDirect, Google Scholar) identified five relevant articles. Study quality, rated by means of a modified Downs &amp; Black checklist, was moderate to high (average: 13.5/16 points). Four of five papers, in at least one parameter, found either an association of lower PGF and reduced task safety or significantly reduced task safety in low vs. high PGF performers. Yet, as a) the outcomes, populations and statistical methods of the included trials were highly heterogeneous and b) only two out of five studies had an adequate control condition (pre-planned movement task), evidence was classified as conflicting. In sum, PGF may represent a factor increasing injury risk during unplanned sports-related movements but future research strengthening the evidence of this association is warranted.

The Relation of Kinematic Synergy to Stabilize the Center of Mass During Walking With Future Falls: A 1-Year Longitudinal Study

2020 ◽  
Author(s):  
Momoko Yamagata ◽  
Hiroshige Tateuchi ◽  
Itsuroh Shimizu ◽  
Junya Saeki ◽  
Noriaki Ichihashi
Keyword(s):  
Older Adults ◽  
Center Of Mass ◽  
Vertical Direction ◽  
Frontal Plane ◽  
Community Dwelling ◽  
Uncontrolled Manifold ◽  
Baseline Visit ◽  
Segmental Coordination ◽  
One Year ◽  
Base Of Support

Abstract Background: An incorrect transfer of center of mass (CoM) to outside the base of support is a frequent cause of falls, and segmental coordination to control CoM is crucial during walking. Uncontrolled manifold (UCM) analysis is a method of examining the relation between variances in segmental coordination and the CoM stability. However, no study has investigated through a prospective cohort study how variance in segmental configurations to stabilize CoM relates to future falls. This study explored whether variances to stabilize the CoM were related to future falls.Methods: At the baseline visit, 30 community-dwelling older adults walked 20 times on a 6-m walkway. Using kinematic data during walking, UCM analysis was performed to investigate how segmental configuration contributes to the CoM stability in the frontal plane. One year after the baseline visit, we evaluated whether the subjects experienced falls; 12 had experienced falls and 16 had not. Comparisons of variances between older adults with and without falls were conducted by covariate analysis.Results: No significant differences in variances were found in the mediolateral direction, whereas in the vertical direction, older adults with fall experiences had a greater variance, reflecting unstable CoM, than those with no fall experiences.Conclusions: We verified that the high variance in segmental configurations that destabilize CoM in the vertical direction was related to future falls. The variables of UCM analysis can be useful to evaluate fall risks.

scholarly journals Perceptual–Cognitive Function and Unplanned Athletic Movement Task Performance: A Systematic Review

2020 ◽  
Vol 17 (20) ◽  
pp. 7481
Author(s):  
Jan Wilke ◽  
David Groneberg ◽  
Winfried Banzer ◽  
Florian Giesche
Keyword(s):  
Systematic Review ◽  
Cognitive Function ◽  
Task Performance ◽  
Lower Limb ◽  
Injury Risk ◽  
Future Research ◽  
Functional Safety ◽  
Study Quality ◽  
And Performance ◽  
Cutting Direction

The performance of choice-reaction tasks during athletic movement has been demonstrated to evoke unfavorable biomechanics in the lower limb. However, the mechanism of this observation is unknown. We conducted a systematic review examining the association between (1) the biomechanical and functional safety of unplanned sports-related movements (e.g., jumps/runs with a spontaneously indicated landing leg/cutting direction) and (2) markers of perceptual–cognitive function (PCF). A literature search in three databases (PubMed, ScienceDirect and Google Scholar) identified five relevant articles. The study quality, rated by means of a modified Downs and Black checklist, was moderate to high (average: 13/16 points). Four of five papers, in at least one parameter, found either an association of PCF with task safety or significantly reduced task safety in low vs. high PCF performers. However, as (a) the outcomes, populations and statistical methods of the included trials were highly heterogeneous and (b) only two out of five studies had an adequate control condition (pre-planned movement task), the evidence was classified as conflicting. In summary, PCF may represent a factor affecting injury risk and performance during unplanned sports-related movements, but future research strengthening the evidence for this association is warranted.

Relative Importance of Leader Influences for Subordinates’ Proactive Behaviors, Prosocial Behaviors, and Task Performance

2014 ◽  
Vol 13 (2) ◽  
pp. 70-86 ◽  
Author(s):  
Dan S. Chiaburu ◽  
Troy A. Smith ◽  
Jiexin Wang ◽  
Ryan D. Zimmerman
Keyword(s):  
Task Performance ◽  
Transformational Change ◽  
Future Research ◽  
Contingent Reward ◽  
Work Effectiveness ◽  
Leader Influence ◽  
Member Exchange ◽  
Proactive Behaviors ◽  
Reported Data ◽  
Transactional Leader

We meta-analytically examine the relationships between three forms of leader influence, contingent reward (transactional), leader-member exchange (LMX; relational), and transformational (change-oriented) on subordinates’ proactive behaviors. Using non-self-reported data from a combined sample of more than 9,000 employees, we confirm positive relationships between leader influences and employee proactive outcomes. We examine the extent to which one leadership influence is stronger than the others in promoting subordinate proactivity. By combining our new meta-analytic data with existing meta-analytic correlations, we further investigate the extent to which various leadership predictors are differentially related to proactive and prosocial contextual performance, and to task performance. For all outcomes, there are only minimal differences between the contingent reward, LMX, and transformational leadership predictors. Using our results, we propose future research directions for the relationship between leader influences and subordinate work effectiveness.

Ergonomic Process Improvement for Mapping Risk and Identifying Key Interventions for Eliminating Injuries from Needles and Sharps in the OR

2020 ◽  
Vol 64 (1) ◽  
pp. 716-720
Author(s):  
Pramila Kalaga ◽  
Barbara Wolford ◽  
Matthew Mormino ◽  
Timothy Kingston ◽  
Julie Fedderson ◽  
...  
Keyword(s):  
Risk Factors ◽  
Process Improvement ◽  
Injury Risk ◽  
Best Practice ◽  
Physical Workload ◽  
Physical Factors ◽  
Improvement Project ◽  
Targeted Interventions ◽  
Effective Interventions ◽  
Sharps Injury

The risk of a needle stick or sharps injury in the operating room (OR) is high due to conditions such as minimal physical protective measures, frequent transfer of sharps, and reliance on human attention and skill for injury avoidance. An ergonomic process improvement project was initiated at a large metro teaching hospital to identify ergonomic risk factors for these OR injuries. To maximize the engagement of the front- end users, an ergonomic process improvement (EPI) team was developed, consisting of representatives from participating OR teams, an employee health nurse and two ergonomists. Surveys, observations, and interviews were conducted to quantify injury risk for the OR teams, evaluate barriers to best practice adherence, and identify opportunities for targeted interventions. Risk mapping was completed for the surgeons, surgical techs and OR nurses identifying double gloving and safe passing zone as areas in need of improvement. Through observation and interviews, researchers identified physical factors relating to musculoskeletal pain and cognitive factors leading to distractions as safety risk concerns. The overall success of the EPI was the engagement of the OR teams and surgeons in the process of identifying risk factors and potential opportunities for ergonomic solutions related to cognitive workload, physical workload, teamwork, and work design for injury prevention. The risk factors identified will provide the basis for developing targeted, effective interventions for eliminating injuries from needles and sharps within the OR.

scholarly journals Review of Trimester-Specific Gestational Weight Gain and Childhood Adiposity

2014 ◽  
Vol 34 (1) ◽  
pp. 48-53
Author(s):  
K Thapa
Keyword(s):  
Weight Gain ◽  
Childhood Obesity ◽  
Gestational Weight Gain ◽  
Future Research ◽  
Institute Of Medicine ◽  
Short Term ◽  
Global Epidemic ◽  
Targeted Interventions ◽  
Gestational Weight ◽  
Childhood Adiposity

Childhood obesity is a global epidemic and a major public health challenge. There has been increasing evidence that intrauterine exposures, such as alcohol, smoking, and maternal nutritional status, may affect both the long and short term health consequences of the mother and offspring. Childhood adiposity may be affected by the mother’s pre-pregnancy weight and her weight gain during pregnancy. Consequently, interventions may need to start before conception of the child to prevent childhood obesity. In 2009, the Institute of Medicine updated its gestational weight gain recommendations by incorporating rates of gestational weight gain in the second and third trimesters based on the mother’s pre-pregnancy Body Mass Index. There is extensive research on the association between total gestational weight gain and short-term offspring adiposity. However, this review focuses on the association between trimester-specific gestational weight gain and childhood adiposity for singleton pregnancies with respect to the Institute of Medicine’s newly defined weight gain recommendations as very few studies have examined the association between the gestational weight gain during each trimester and childhood adiposity. Identifying the trimester that is most associated with childhood adiposity may help in the development of targeted interventions, guide physician’s nutritional and weight-gain recommendations for child-bearing mothers, and direct future research. DOI: http://dx.doi.org/10.3126/jnps.v34i1.8429   J Nepal Paediatr Soc 2014;34(1):48-53

Sign in / Sign up

Export Citation Format

Share Document