The association between menarche,intensity of training and passive joint ROM in young pre-professional female dancers: A longitudinal follow-up study |
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| Affiliation: | 1. The Wingate College of Physical Education and Sports Sciences at the Wingate Institute, Netanya, Israel;2. Department of Orthopedic Surgery, Chaim Sheba Medical Center Tel-Hashomer, Affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel;3. Department of Radiology, Sheba Medical Center, Tel Hashomer, Israel, Affiliated to Sackler School of Medicine, Tel Aviv University, Israel;4. Orthopedic Rehabilitation Dept., Sheba Medical Center, Tel-Hashomer, Israel;1. Department of Physical Therapy, Tiradentes University Center, Maceió, AL, Brazil;2. Department of Physical Therapy, Nove de Julho University, São Paulo, SP, Brazil;3. Department of Physical Education, Federal University of Maranhão, São Luís, MA, Brazil;1. University of Brasilia, Division of Physical Therapy, Campus UnB Ceilândia, QNN 14, Ceilândia Sul, Brasilia, DF, 72220-140, Brazil;2. Department of Physical Therapy, Secretaria do Estado de Saúde do Distrito Federal, University of Brasilia, Campus Universitário Darcy Ribeiro, Brasilia, DF, 70904-970, Brazil;3. College of Physical Education, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasilia, DF, 70904-970, Brazil;4. Brasilia University Hospital, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasilia, DF, 70904-970, Brazil;5. College of Physical Education and Dance, Universidade Federal de Goiás, Goiânia, Goiás, Brazil;1. Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas LT 44221, Lithuania;2. School of Healthcare Science, Manchester Metropolitan University, Manchester M15 6BH, United Kingdom;3. Department of Laboratory Medicine, Medical Academy, Lithuanian University of Health Sciences, Kaunas LT 44307, Lithuania;4. Institute of Sport Pedagogy and Coaching Sciences, University of Tartu, Tartu 50090, Estonia;1. University of KwaZulu-Natal (UKZN), King Edward Ave, Scottsville, Pietermaritzburg, 3209, Durban, KwaZulu-Natal, South Africa;2. University of the Witwatersrand, Richard Ward, 1 Jan Smuts Ave, Braamfontein, 2000, Johannesburg, Gauteng, South Africa;3. Statistical Consultation Services, Potchefstroom Campus, North-West University, Hoffman St, Potchefstroom, 2520, South Africa;1. 206A Charles Wethington Building, University of Kentucky, 900 South Limestone Street, Lexington, KY 40536, United States;2. Room A10, Indiana State University, 567 N 5th Street, Terre Haute, IN 47809, United States;3. 206B Charles Wethington Building, University of Kentucky, 900 South Limestone Street, Lexington, KY 40536, United States;1. MedStar Georgetown University Hospital, Washington, DC, U.S.A.;2. Georgetown University School of Medicine, Washington, DC, U.S.A. |
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| Abstract: | ObjectivesTo determine the association between the status of menarche (yes/no), the intensity of training and the potential to improve passive joint range of motion (ROM) over a 12-month period of dance training.DesignProspective cohort study.SettingDance studio.ParticipantsFifty-nine female dancers aged 12.8 ± 0.5.Main outcome measuresThe dancers were asked about their dance intensity and screened for anthropometric parameters and passive joint ROM in Grades 7 and 8.ResultsAlong the 12 months of dance training, we found significantly increased ankle-foot en-pointe, hip abduction, and hip external rotation (ER); significantly decreased hip internal rotation (IR); and significant increased hip ER:IR ratio. In Grade 7, 26 dancers (44.1%) reached menarche (Yes menarche); in Grade 8 an additional 23 dancers (39.0%) reached menarche (No/Yes menarche); and 10 dancers (16.9%) had not reached menarche (No menarche). MANOVA (mixed models) with repeated measures to compare joint ROM between the three menarche groups (Yes; No/Yes; No), with h/week dance practice as a co-variant, showed that hip ER, ankle-foot en-pointe, and ER:IR were significantly correlated with h/week in all three menarche groups.ConclusionsMost passive joint ROM can be improved over 12 months of dancing around the age onset of menarche. H/week of dance practice is a main factor contributing to improved hip ER, ankle-foot en-pointe and ER/IR ratio. |
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| Keywords: | Dancer Age onset of menarche Passive joint ROM Dance intensity |
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