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Feet dancers

Alycia Fong Yan, Richard M Smith, Claire E Hiller, Peter J Sinclair
OBJECTIVES: To quantify the impact attenuation properties of the jazz shoes, and to investigate the in-vivo effect of four jazz shoe designs on lower limb joint stiffness during a dance-specific jump. DESIGN: Repeated measures. METHODS: A custom-built mechanical shoe tester similar to that used by athletic shoe companies was used to vertically impact the forefoot and heel region of four different jazz shoe designs. Additionally, dancers performed eight sautés in second position in bare feet and the shoe conditions...
October 5, 2016: Journal of Science and Medicine in Sport
A B M Boni Rietveld, Willemijn M Diemer
This study is to draw attention to a relatively common anatomical anomaly and its possible operative treatment in dancers. The accessory navicular, or os tibiale externum, is an accessory bone on the medial side of the navicular of the foot at the insertion of the posterior tibial tendon (PTT). It can cause obvious hyperpronation, medial foot pain, and a limited and painful relevé in dancers. To the best of our knowledge, this is the first report on the operative treatment of the accessory navicular exclusively in dancers...
2016: Journal of Dance Medicine & Science
Agnieszka Nawrocka, Arkadiusz Mynarski, Aneta Powerska, Michal Rozpara, WiesLaw Garbaciak
BACKGROUND: Although the growing popularity of pole dance as a leisure-time activity of people of all ages, the problem of physical effects of exercise on the pole is not considered in the scientific literature. The aim of this study was to evaluate and compare the hand grip strength, body composition and postural stability of fitness pole dancers with different training experience. METHODS: Inclusion criteria were met by 52 female pole dancers. The research program included assessment of body composition (using BC-418 Segmental Body Composition Analyzer Tanita), hand grip strength by hydraulic dynamometer JAMAR, and postural stability using ALFA stabilometric platform...
July 6, 2016: Journal of Sports Medicine and Physical Fitness
Jessica Meier, Marlene Sofie Topka, Jürgen Hänggi
It is known that intensive training and expertise are associated with functional and structural neuroadaptations. Most studies, however, compared experts with nonexperts; hence it is, specifically for sports, unclear whether the neuroplastic adaptations reported are sport-specific or sport-general. Here we aimed at investigating sport-specific adaptations in professional handball players and ballet dancers by focusing on the primary motor and somatosensory grey matter (GM) representation of hands and feet using voxel-based morphometry as well as on fractional anisotropy (FA) of the corticospinal tract by means of diffusion tensor imaging-based fibre tractography...
2016: Neural Plasticity
Antonia M Zaferiou, Rand R Wilcox, Jill L McNitt-Gray
This study determined how dancers regulated angular and linear impulse during the initiation of pirouettes of increased rotation. Skilled dancers (n = 11) performed single and double pirouette turns with each foot supported by a force plate. Linear and angular impulses generated by each leg were quantified and compared between turn types using probability-based statistical methods. As rotational demands increased, dancers increased the net angular impulse generated. The contribution of each leg to net angular impulse in both single and double pirouettes was influenced by stance configuration strategies...
October 2016: Journal of Applied Biomechanics
Razia Rehmani, Yoshimi Endo, Phillip Bauman, William Hamilton, Hollis Potter, Ronald Adler
BACKGROUND: Altered biomechanics from repetitive microtrauma, such as long practice hours in en pointe (tip of the toes) or demi pointe (balls of the feet) predispose ballet dancers to a multitude of musculoskeletal pathologies particularly in the lower extremities. Both ultrasound and magnetic resonance imaging (MRI) are radiation-sparing modalities which can be used to confidently evaluate these injuries, with ultrasound (US) offering the added utility of therapeutic intervention at the same time in experienced hands...
October 2015: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
Jeffrey A Russell, Hiroshi Yoshioka
BACKGROUND: The en pointe position of the ankle in ballet is extreme. Previously, magnetic resonance imaging (MRI) of ballet dancers' ankles en pointe was confined to a low field, open MR device. PURPOSE: To develop a reproducible ankle MRI protocol for ballet dancers en pointe and to assess the positions of the key structures in the dancers ankles. MATERIAL AND METHODS: Six female ballet dancers participated; each was randomly assigned to stand en pointe while one of her feet and ankles was splinted with wooden rods affixed with straps or to begin with the ankle in neutral position...
August 2016: Acta Radiologica
Darrell Martin, Jamie Dowling, Fiachra Rowan, Mary Casey, Paul O'Grady
Ganglion cysts are common benign masses, usually occurring in the hands and feet. This report describes the case of a young female Irish dancer who presented with paresthesia of her foot due to a ganglion in near proximity to the superficial peroneal nerve. Midfoot ganglia in young girls engaged in Irish dance can limit their ability to participate. This pathology requires further epidemiological studies to investigate its prevalence. In the event of failed conservative management, surgical intervention to excise the cyst and decompress the nerve is an effective treatment to facilitate return to dancing...
June 2015: Journal of Dance Medicine & Science
Kaanda Nabilla Souza Gontijo, Cláudia Tarragô Candotti, Grace Dos Santos Feijó, Lais Paixão Ribeiro, Jefferson Fagundes Loss
Lack of alignment between the lowerlimb structures, such as the hips, knees, and longitudinal arches of the feet, has been described as an important predisposing factor in musculoskeletal injury among classical ballet dancers. However, no studies were found that analyzed basic ballet movements with quantification of objective criteria of the movements. The purposes of this study were: 1. to establish a methodology to quantify, using kinematic evaluation, the technical criteria that guide the correct execution of all phases of the plié (simultaneous flexion of the hips, knees, and ankle joints); and 2...
June 2015: Journal of Dance Medicine & Science
Gry Galta van Merkensteijn, Edel Quin
Dancers may compensate alignment at the spine, hip, knees, ankles, and feet to achieve a greater turnout than is available at the hip alone. Such compensations are believed to lead to many of the musculoskeletal injuries experienced by dancers, especially overuse injuries. The aim of this study was to explore the relationship between compensated turnout and injury of the lower extremities and low back. Twenty-two university level modern dancers age 19 to 23 participated. Measurements were taken of active hip external rotation (AHER) prone and functional turnout (FTO) in first position...
June 2015: Journal of Dance Medicine & Science
Matthew Harold Woolhouse, Rosemary Lai
In previous studies investigating entrainment and person perception, synchronized movements were found to enhance memory for incidental person attributes. Although this effect is robust, including in dance, the process by which it is actuated are less well understood. In this study, two hypotheses are investigated: that enhanced memory for person attributes is the result of (1) increased gaze time between in-tempo dancers; and/or (2) greater attentional focus between in-tempo dancers. To explore these possible mechanisms in the context of observing dance, an eye-tracking study was conducted in which subjects watched videos of pairs of laterally positioned dancers; only one of the dancers was synchronized with the music, the other being asynchronous...
2014: Frontiers in Human Neuroscience
Janet Simon, Emily Hall, Carrie Docherty
Previous investigations have established that dancers suffer a large number of injuries to the lower leg, foot, and ankle, with a portion of these being significant time loss injuries or in some cases career ending. Lateral ankle sprain is a common injury in dancers and can often lead to recurrent instability and repetitive injuries. Research in other active populations has linked ankle sprains to the development of chronic ankle instability (CAI). Therefore, the purpose of this study was to identify the prevalence of CAI and related symptoms of ankle sprain in a student dance population...
2014: Journal of Dance Medicine & Science
José M Castillo-López, Alfonso Vargas-Macías, Gabriel Domínguez-Maldonado, Guillermo Lafuente-Sotillos, Javier Ramos-Ortega, Inmaculada C Palomo-Toucedo, María Reina-Bueno, Pedro V Munuera-Martínez
OBJECTIVES: The objectives of this study were to determine the frequency of metatarsal pain and of hyperkeratosis on the plantar forefoot in female professional flamenco dancers, and to determine whether there is a relationship between the two disorders. METHOD: Forty-four female professional flamenco dancers, with a minimum activity of 25 hrs/wk, participated in this cross-sectional study. The presence or absence of metatarsal pain while dancing was recorded, and plantar pressures were measured on a pressure platform, both barefoot and shod with the usual dance shoe...
December 2014: Medical Problems of Performing Artists
Kathleen L Davenport, Liane Simmel, Nancy Kadel
Hallux valgus is a common deformity of the forefoot. There is no doubt that some dancers develop hallux valgus, but the question remains as to whether dancers are at greater risk than the general population for developing this deformity. Review of the literature reveals on-going debate regarding risk factors for hallux valgus, which may include increasing age, female gender, genetic predisposition, constrictive shoe wear, first ray hypermobility, foot architecture, tight Achilles tendon, and first metatarsal length...
2014: Journal of Dance Medicine & Science
Sarah M Yu, Marcella Dardani, Joseph S Yu
OBJECTIVE: Isolated cuboid stress fractures are rare. The purpose of this study was to evaluate the MRI appearance of this condition. MATERIALS AND METHODS: A retrospective search for patients with the diagnosis of a cuboid stress fracture was performed for a 19-year period. All patients underwent an initial three-view radiographic foot series for pain. MRI was performed because symptoms persisted beyond 4 weeks. RESULTS: Ten patients, nine of whom were women, were diagnosed with isolated cuboid stress fractures...
December 2013: AJR. American Journal of Roentgenology
Carlo Biz, Laura Favero, Carla Stecco, Roberto Aldegheri
Hypermobility of the first ray, which is caused by an instability of the first metatarsocuneiform joint, is one of the factors that induces hallux valgus and can be caused by technical mistakes in ballet practice. Correlation between ballet practice and hypermobility of the first ray. Using a modified Klaue device, mobility of the first metatarsocuneiform joint was measured (hypermobility ≥ 10mm) in both dorsal and dorso-medial directions in 264 feet in 2 groups of people: ballet dancers (non professional) and a control group of non-dancers...
October 2012: Muscles, Ligaments and Tendons Journal
Renata Alvares Denardi, Umberto Cesar Corrêa
This study investigated how changes in the focus of instruction might affect the learning by individuals who are not trained dancers of a complex classical ballet movement, the pirouette. Seventy-two volunteer college students were divided into six groups according to the focus of instruction: (1.) head, (2.) arms, (3.) trunk, (4.) knees, (5.) feet, and (6.) controls. In the acquisition phase, all groups performed 160 trials, over 2 consecutive days. At the beginning of each day, they received verbal instruction regarding some of the general principles involved in performance of the pirouette and viewed a video that illustrated those principles...
2013: Journal of Dance Medicine & Science
Donna Krasnow, M Virginia Wilmerding, Shane Stecyk, Matthew Wyon, Yiannis Koutedakis
The purpose of this study was to examine grand battement devant at the barre, in the center, and traveling through space. The primary focus was to consider weight transfer in three conditions: from two feet to one foot for the barre and center conditions, and from one foot to the other foot in traveling. Forty female dancers volunteered (mean age 30.0 ± 13.0 yrs) and were placed in three groups: beginner (n = 12), intermediate (n = 14), and advanced (n = 14). Data were collected with a 7-camera Vicon motion capture system using a Plug-in Gait Full Body Marker set and with two Kistler force plates...
June 2012: Medical Problems of Performing Artists
Stephen J Pearson, Alison F Whitaker
This study explores the relationship between dance shoe type and foot pressure characteristics. During adolescence, while the foot is still developing, limiting focal pressure on the feet may help reduce the risk of injury. In order to "condition" the feet for advanced dance, where pointe shoes are worn, it may be advisable to first utilize demi-pointe shoes. Eight female dancers were each tested in four footwear conditions (barefoot, soft, demi-pointe, and pointe shoes), and patterns of foot pressure were compared...
2012: Journal of Dance Medicine & Science
Chao-Hsuan Liu, Ovid J L Tzeng, Daisy L Hung, Philip Tseng, Chi-Hung Juan
Many studies have used static and non-biologically related stimuli to investigate bistable perception and found that the percept is usually dominated by their intrinsic nature with some influence of voluntary control from the viewer. Here we used a dynamic stimulus of a rotating human body, the silhouette spinner illusion, to investigate how the viewers' intentions may affect their percepts. In two experiments, we manipulated observer intention (active or passive), fixation position (body or feet), and spinning velocity (fast, medium, or slow)...
May 1, 2012: Vision Research
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