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  1. Article: Effects of Dancer-Specific Biomechanics on Adolescent Ballet Dancers' Posture En Pointe and Factors Related to Pointe Readiness: A Cross-Sectional Study.

    Veirs, Kimberly P / Rippetoe, Josiah / Baldwin, Jonathan D / Fagg, Andrew / Haleem, Amgad / Jeffries, Lynn / Randall, Ken / Sisson, Susan / Dionne, Carol P

    Medical problems of performing artists

    2023  Volume 38, Issue 3, Page(s) 155–163

    Abstract: Objective: There are no universally accepted requirements or uniform protocols to determine when dancers can safely commence dancing en pointe (shod relevé). The purpose of this study was to examine dancer-specific biomechanics of adolescent pointe ... ...

    Abstract Objective: There are no universally accepted requirements or uniform protocols to determine when dancers can safely commence dancing en pointe (shod relevé). The purpose of this study was to examine dancer-specific biomechanics of adolescent pointe dancers and explore factors that may help determine pointe readiness.
    Methods: Dancers (n=26; median age 14 yrs [IQR=13-16]) were stratified into two groups based on the ability to stand on the pointe shoe box as per a plumb line (Group 1: on the box; Group 2: not on the box) during parallel, shod relevé. Measurements included unshod weight-bearing range of motion (ROM) of ankle plantarflexion (PF) and first metatarsophalangeal (MTP) extension and shod posture assessment during first position elevé (rising into relevé with turned out, straight legs). Qualisys 3D motion capture and AMTITM force plates recorded dancers performing 10-15 repetitions of first position elevé. Comparison of three kinematic and three kinetic variables aimed to describe group differences during unshod and shod conditions. Wilcoxon signed-rank test assumed no difference between groups with a Bonferroni correction (p<0.0083).
    Results: During unshod parallel relevé, ROM was different between groups for first MTP extension (deg; MedGroup1: 90°, IQR 80°-90°; MedGroup 2: 70°, IQR: 70°-80°, p<0.0001) but no statistical difference in ankle PF (deg; p=0.0098). There were no differences in C7 displacement (m; p=0.5055), ankle PF moment (p=0.1484), or hip mediolateral and anteroposterior moments (p=0.8785 and 0.8785, respectively) during shod first position relevé, indicating that both groups tend to engage the same dominant muscle groups (trunk extensors, ankle dorsiflexors, hip flexors, and hip abductors) during elevé.
    Conclusion: Dancers in Group 1 demonstrated greater first MTP extension during unshod relevé compared to dancers in Group 2. Weight-bearing ROM could be a valuable tool in predicting pointe readiness of adolescent ballet dancers.
    MeSH term(s) Adolescent ; Humans ; Biomechanical Phenomena ; Cross-Sectional Studies ; Dancing ; Posture ; Ankle Joint
    Language English
    Publishing date 2023-09-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 639194-1
    ISSN 0885-1158
    ISSN 0885-1158
    DOI 10.21091/mppa.2023.3019
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Comparing Temporospatial Performance During Brisk and Self-Paced Walking by Men With Osteomyoplastic Transfemoral Amputation and Controls Using Pressure and Muscle Activation Peak Times.

    Shotande, Monique O / Veirs, Kimberly P / Day, Jonathan D / Ertl, William J J / Fagg, Andrew H / Dionne, Carol P

    Frontiers in rehabilitation sciences

    2022  Volume 3, Page(s) 848657

    Abstract: Background: The aim of osteomyoplastic transfemoral amputation (OTFA) is to produce sustained, robust prosthetic gait performance by residuum reconstructing. A better understanding of residuum-socket interface pressures (RSI) and residuum muscle ... ...

    Abstract Background: The aim of osteomyoplastic transfemoral amputation (OTFA) is to produce sustained, robust prosthetic gait performance by residuum reconstructing. A better understanding of residuum-socket interface pressures (RSI) and residuum muscle activation should uniquely reveal gait stability to better inform long-term rehabilitation goals.
    Objectives: The objectives of this study are to characterize RSI pressures and residuum muscle activation in men with OTFA while walking at two speeds and compare temporospatial muscle activation with intact controls.
    Methods: In this study, we observed and compared healthy men with OTFA and controls during 2-min gait trials at brisk and self-paced speeds, two visits, and 1 year apart. RSI pressures and hip adductors, hamstrings, and quadriceps activation were recorded for those with OTFA. OTFA temporospatial muscle activation patterns were compared with the controls. Within the extracted strides, heel-strike and toe-off events and EMG activation peak times were characterized and compared. Peak times for pressure and EMG activity were examined in individual muscles and antagonist muscles of residual and intact limbs.
    Results: Six men with OTFA exhibited adductor, hamstring, and quadriceps co-contraction within intact and residual limbs, regardless of walking speed or trial. Co-contraction within their intact limb occurred throughout the gait cycle. Within the residuum, co-contraction occurred during weight transference. The 75% most likely RSI peaks occurred during stance. EMG peaks were 75% most likely to occur during early stance, terminal stance-initial swing, and terminal swing.
    Conclusion: Participants with OTFA demonstrated adductors-hamstrings-quadriceps co-contraction in the intact thigh and residuum with corresponding RSI pressure increase, primarily during transitions between stance and swing, indicating gait instability, demonstrating the need to explicitly address these deficits continuously in rehabilitation and wellness settings.
    Language English
    Publishing date 2022-05-06
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2673-6861
    ISSN (online) 2673-6861
    DOI 10.3389/fresc.2022.848657
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Applications of Biomechanical Foot Models to Evaluate Dance Movements Using Three-Dimensional Motion Capture: A Review of the Literature.

    Veirs, Kimberly P / Fagg, Andrew H / Haleem, Amgad M / Jeffries, Lynn M / Randall, Ken / Sisson, Susan B / Dionne, Carol P

    Journal of dance medicine & science : official publication of the International Association for Dance Medicine & Science

    2022  Volume 26, Issue 2, Page(s) 69–86

    Abstract: Dance movement requires excessive, repetitive range of motion (ROM) at the foot-ankle complex, possibly contributing to the high rate of injury among dancers. However, we know little about foot biomechanics during dance movements. Researchers are using ... ...

    Abstract Dance movement requires excessive, repetitive range of motion (ROM) at the foot-ankle complex, possibly contributing to the high rate of injury among dancers. However, we know little about foot biomechanics during dance movements. Researchers are using three-dimensional (3D) motion capture systems to study the in vivo kinematics of joint segments more frequently in dance-medicine research, warranting a literature review and quality assessment evaluation. The purpose of this literature review was to identify and evaluate studies that used 3D motion capture to analyze in vivo biomechanics of the foot and ankle for a cohort of dancers during dance-specific movement. Three databases (PubMed, Ovid MEDLINE, CINAHL) were accessed along with hand searches of dance-specific journals to identify relevant articles through March 2020. Using specific selection criteria, 25 studies were identified. Fifteen studies used single-segment biomechanical foot models originally created to study gait, four used a novel two-segment model, and six utilized a multi-seg- ment foot model. Nine of the studies referenced common and frequently published gait marker sets and four used a dance-specific biomechanical model with purposefully designed foot segments to analyze the dancers' foot and ankle. Description of the biomechanical models varied, reducing the reproducibility of the models and protocols. Investigators concluded that there is little evidence that the extreme total, segmental, and inter-segmental foot and ankle ROM exerted by dancers are being evaluated during dance-specific movements using 3D motion capture. Findings suggest that 3D motion capture is a robust measurement tool that has the capability to assist researchers in evaluating the in vivo, inter-segmental motion of the foot and ankle to potentially discover many of the remaining significant factors predisposing dancers to injury. The literature review synthesis is presented with recommendations for consideration when evaluating results from studies that utilized a 3D biomechanical foot model to evaluate dance-specific movement.
    MeSH term(s) Ankle Joint ; Biomechanical Phenomena ; Dancing/injuries ; Humans ; Movement ; Range of Motion, Articular ; Reproducibility of Results
    Language English
    Publishing date 2022-03-15
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 1089-313X
    ISSN 1089-313X
    DOI 10.12678/1089-313X.061522a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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