Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science (J Dance Med Sci)

Publisher: International Association for Dance Medicine & Science

Journal description

Each issue focuses on bringing you the current results of clinical and experimental research. The aim of the Journal of Dance Medicine & Science is to provide you with one source for up-to-date information. Featured articles are drawn from the fields of:

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Website Journal of Dance Medicine and Science website
Other titles Journal of dance medicine & science (Online), Dance medicine & science, Journal of dance medicine and science
ISSN 1089-313X
OCLC 61314134
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: 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. The difference between FTO and AHER was designated as compensated turnout (CTO). A questionnaire was conducted to gather information about dancers' injuries within the past 2 years. A total of 17 participants (77%) reported experiencing at least one injury in the 24 month period. All dancers compensated turnout. Results revealed a large variability in CTO among participants, ranging from 3° to 72°. Statistical analysis showed a significant relationship (r = 0.45, N = 22, p = 0.04) between CTO and the number of injuries experienced, especially as related to low back pain (r = 0.50, N = 22, p = 0.02). Students with no injury had a CTO mean of 26°, while those with two or more injuries had a CTO mean of 43°. Results contribute to previous studies that have examined the effects of CTO in ballet dancers and further indicate that compensatory patterns of turnout may increase the risk of experiencing more than one injury in university level modern dancers.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 06/2015; 19(2):57-62. DOI:10.12678/1089-313X.19.2.57
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    ABSTRACT: We present the case of a 14-year-old pre-professional ballerina that demonstrates common features of two conditions affecting the midfoot that are often missed or subject to delay in diagnosis in such young athletes: 1. stress fractures at the base of the second metatarsal, and 2. sprain of the Lisfranc joint complex. While these represent potentially career-altering injuries in the professional dancer, this case demonstrates that a high index of clinical suspicion, careful physical exam, appropriate radiographic assessment, and prompt treatment are essential to achieving the best possible outcome.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 06/2015; 19(2). DOI:10.12678/1089-313X.19.2.80
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    ABSTRACT: 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.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 06/2015; 19(2):77-9. DOI:10.12678/1089-313X.19.2.77
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    ABSTRACT: The objective of this study was to review the evidence for selected risk factors of lower extremity overuse injuries in young elite female ballet dancers. An electronic search of key databases from 1969 to July 2013 was conducted using the keywords dancers, ballet dancers, athletes, adolescent, adolescence, young, injury, injuries, risk, overuse, lower limb, lower extremity, lower extremities, growth, maturation, menarche, alignment, and biomechanics. Thirteen published studies were retained for review. Results indicated that there is a high incidence of lower extremity overuse injuries in the target population. Primary risk factors identified included maturation, growth, and poor lower extremity alignment. Strong evidence from well-designed studies indicates that young elite female ballet dancers suffer from delayed onset of growth, maturation, menarche, and menstrual irregularities. However, there is little evidence that this deficit increases the risk of overuse injury, with the exception of stress fractures. Similarly, there is minimal evidence linking poor lower extremity alignment to increased risk of overuse injury. It is concluded that further prospective, longitudinal studies are required to clarify the relationship between growth, maturation, menarche, and lower extremity alignment, and the risk of lower extremity overuse injury in young elite female ballet dancers.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 06/2015; 19(2). DOI:10.12678/1089-313X.19.2.51
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    ABSTRACT: 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. to explore whether experienced ballet dancers respect those criteria when performing the plié. The technical criteria considered were the following: 1. midfoot stability; 2. pelvic positioning in a neutral alignment; 3. pelvic stability, represented by pelvic angle variation; and 4. vertical alignment of the knee joint with the second toe of the ipsilateral foot. Twenty dancers from Porto Alegre, Brazil, with 18 years of uninterrupted ballet training, were filmed while performing plié using four synchronized cameras. The descriptive statistical analysis involved calculating the median, minimum, and maximum of each of the technical criteria. Results showed that for criterion 1, the 20 dancers showed great stabilization of the midfoot; for criteria 2 and 3, 18 dancers displayed pelvic instability tending toward retroversion throughout execution of the plié; and for criterion 4, 13 dancers presented with medial misalignment of the knees at all phases of the plié. Using these criteria, it was possible to characterize the plié from a kinematic point of view.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 06/2015; 19(2):70-6. DOI:10.12678/1089-313X.19.2.70
  • Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 03/2015; 19(1):44-5. DOI:10.12678/1089-313X.19.1.44
  • [Show abstract] [Hide abstract]
    ABSTRACT: Atrophy of the stabilizing muscles of the hip, such as quadratus femoris (QF), may predispose the hip joint to dysfunction. Ultrasound imaging (USI) has been shown to be a valid and reliable method of measuring the size of several hip muscles, but QF size has not been investigated. The objectives of this study were to establish the criterion validity of USI against the "gold standard" magnetic resonance imaging (MRI) for measuring the QF cross-sectional area (CSA) and to investigate intra-rater reliability of USI. Eleven current or retired professional ballet dancers (six women, five men) volunteered for USI of their QF within 1 week of MRI. The mean CSAs of QF were compared between the two imaging modalities, and the mean USI CSAs from two different trials were compared. Mean CSA with MRI (4.8 cm(2), ± 1.54) was significantly larger than mean CSA with USI (4.29 cm(2) ± 1.56; t = 5.82; p < 0.001), and the mean difference was 0.41 cm² (9%). However, the measures were highly correlated for intra-class reliability (r = 0.96, p < 0.001), and intra-class correlation coefficients (ICC) demonstrated excellent agreement (ICC = 0.90; 95% confidence interval [CI]: 0.20 -0.97) and consistency of measures (ICC = 0.96; 95% CI: 0.90- 0.98). Intra-rater reliability of measuring QF with USI was excellent between two trials (ICC = 0.98; 95% CI: 0.96- 0.99). The minimal detectable change at a 95% CI (MDC95) was 0.38 cm(2) (9.5%). It is concluded that USI is a valid and reliable measure of QF muscle size and can be used to measure QF CSA in a research or clinical setting.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 03/2015; 19(1):3-10. DOI:10.12678/1089-313X.19.1.3
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    ABSTRACT: Research undertaken with athletes has shown that lower-evaluated feedback is related to low self-efficacy levels. However, the relationship between teacher feedback and self-efficacy has not been studied in the dance setting. In sports or dance contexts, very few studies have manipulated feedback content to examine its impact on performers' self-efficacy in relation to the execution of a specific movement. Therefore, the aim of this investigation was to explore the effect of manipulated upper, lower, and accurate grade feedback on changes in dancers' self-efficacy levels for the execution of the "Zapateado" (a flamenco foot movement). Sixty-one students (56 female, 5 male, ages 13 to 22 ± 3.25 years) from a Spanish dance conservatory participated in this experimental study. They were randomly divided into four feedback groups: 1. upper-evaluated, 2. objective and informational, 3. lower-evaluated, and 4. no feedback-control. Participants performed three trials during a 1-hour session and completed questionnaires tapping self-efficacy pre-feedback and post-feedback. After each trial, teachers (who were confederates in the study) were first asked to rate their perception of each dancer's competence level at performing the movement according to conventional criteria (scores from 0 to 10). The results were then manipulated, and students accurate, lower-evaluated, or upper-evaluated scores were given. Those in the accurate feedback group reported positive change in self-efficacy, whereas those in the lower-evaluated group showed no significant change in self-efficacy during the course of the trial. Findings call into question the common perception among teachers that it can be motivating to provide students with inaccurate feedback that indicates that the students' performance level is much better or much worse than they actually perceive it to be. Self-efficacy appears most likely to increase in students when feedback is accurate.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 03/2015; 19(1):22-30. DOI:10.12678/1089-313X.19.1.22
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    ABSTRACT: A high degree of turnout is desired by many dancers. Turnout enables the efficient transfer of weight, allows for greater extension and control, and reduces injury risk when used correctly. The purpose of this study was to determine whether participation in a targeted training program beyond technique classes would improve university dancers' ability to use a greater proportion of the turnout their bodies could accommodate without compensation. Six dancers' ability to produce turnout without distorting their alignment was assessed daily, and a multiple baseline experimental design was used to measure the effects of turnout training. Results showed an average increase of 14° in Total Active Turnout (TAT) for all six dancers. In addition, a dance teacher with special experience in the dance sciences rated all of the dancers as showing better control of turnout while performing an adagio phrase following training than before training. These findings suggest that targeted training may offer a useful approach to helping dancers improve skills that enhance performance and promote good health.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 12/2014; 18(4). DOI:10.12678/1089-313X.18.4.169
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    ABSTRACT: Dancers are exposed to many landings from jumps during class and performance, and repetitive loading has been linked with an increased risk of injury. Little is known about the effect of different dance shoe types on jump landings, and with so many dance shoe designs available to choose from, a thorough exploration is warranted. Dance technique dictates that jump landings be "rolled through the foot," with a toe strike followed by controlled lowering of the ball of the foot and heel. For this study, 3D motion analysis was used to capture the movement of 16 female dancers performing sautés in second position. Lower limb joint kinematics were examined during the landings, both barefoot and in different jazz shoe designs. The results showed that all dancers executed the technique of "rolling through the foot." All jazz shoe designs increased knee and ankle sagittal ROM (p < 0.05) but reduced ankle frontal plane ROM and midfoot ROM in all three planes (p < 0.05). Chorus shoes increased maximum knee flexion by more than 5° during the plié. Jazz shoes restricted midfoot sagittal and transverse plane motion and MPJ sagittal motion compared to barefoot throughout stance phase (p < 0.05). These changes may translate to a reduced capacity to absorb impact or decreased propulsion. Dance jump landings in the jazz shoe designs tested may appear to be heavier due to the greater reliance on knee flexion to absorb impact and less push-off for subsequent jumps.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 12/2014; 18(4):149-58. DOI:10.12678/1089-313X.18.4.149
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    ABSTRACT: Staphylococcus aureus (S. aureus) is a bacterium associated with various infectious diseases. Not only has the bacterium been detected in sports environments, the reported incidences of S. aureus infections have steadily increased in athletic teams. However, in spite of similarities between sports and dance facilities, to our knowledge no previous study has examined the presence of this bacterium in the dance environment. We hypothesized that S. aureus would be present in a university's dance studios, and that it would be extant in higher concentrations inside versus outside the studios. Using common microbiological culturing methods, samples were gathered from floors and barres in three studios of a single university, as well as from outside floors and railings near the studios and a conference room used by dancers. Confirming our hypothesis, we detected S. aureus in every dance studio sample (0.03 to 0.38 cfu/cm 2 ). Supporting our second hypothesis, we found that average S. aureus concentrations from the three studios were significantly higher compared to both outside and conference room samples (P ≤ 0.001). The latter two locations did not yield any S. aureus concentrations. Control samples developed as expected. The results of this study suggest that S. aureus bacteria are common on the flooring and barres of university dance studios, with the bacterial concentrations possibly dependent on the hours of usage of these surfaces. Whether the presence of S. aureus in dance studios presents a health risk to dancers should be studied further.
    Journal of dance medicine & science: official publication of the International Association for Dance Medicine & Science 09/2014; 18(3). DOI:10.12678/1089-313X.18.3.115