Biomechanical Comparison of “Dead” and “New” Pointe Shoes in Female Professional Ballet Dancers

Authors: Jessica Aquino, MS and Tal Amasay, PhD

Corresponding Author:
Tal Amasay, PhD, CSCS, EPC
11300 NE 2nd Ave
Miami Shores, FL 33161
tamasay@barry.edu
305-899-4893

Jessica Aquino has a master degree in movement sciences, is a certified athletic trainer, and work with professional Ballet dancers. Tal Amasay is associate professor at Barry University and the head of the Motion Analysis Center. He is a certified exercise physiologist and certified strength and conditioning coach 

Biomechanical Comparison of “Dead” and “New” Pointe Shoe in Female Professional Ballet Dancers

ABSTRACT

Purpose: Available research on pointe shoes often compare pointe shoes to other dance footwear, however there is a lack of studies comparing dancers’ biomechanics when using “new” pointe shoes and pointe shoes that have worn down, “dead”. The aim of this study was to examine the biomechanical differences exhibited by professional ballet dancers while performing relevé, sous-sus, and pirouette in “dead” and “new” pointe shoes. Methods: Thirteen female (20.9 ± 1.9 years old) professional ballet dancers were asked to perform three trials of relevé, sous-sus, and pirouette in “new” pointe shoes and “dead” pointe shoes. Center of pressure sway area and ground reaction forces in the anterior-posterior, medial-lateral, and vertical directions were recorded using one AMTI force plate. Results: The “dead” pointe shoe condition had significantly higher sway area during relevé, sous-sus, and single pirouette (103 ± 95 mm2; 256 ± 133 mm2; 178 ±129 mm2, respectively) than the “new” pointe shoe condition (50 ± 65 mm2; 110 ± 64 mm2; 77 ± 39 mm2, respectively),  p-value < 0.05. In addition, peak ground reaction force in the anterior-posterior direction during relevé movement was higher in “new” pointe shoes (35 ± 6% body weight) than in “dead” pointe shoes (32 ± 6% body weight), p-value = 0.019. No significant differences were observed for the other dependent variables. Conclusions: A larger sway area was observed in “dead” pointe shoes compared to “new” pointe shoes, which indicates that the participant had less balance in the “dead” pointe shoes than in the “new” pointe shoes. The larger sway area in “dead” pointe shoes may indicate that decrease in shoe integrity may contribute to decrease in the support and stability of the pointe shoe while the ballet dancer maintains the ‘en pointe’ position. Moreover, higher forces in the anterior direction state that the dancers can apply more forces in the “new” point shoe. Application in sport: These results can educate ballet teachers and ballet dancers about the mechanical changes in “dead” pointe shoes, which may lead to injury and reduce in performance. Furthermore, these results may lead to enhancements in footwear design.

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2019-02-13T08:47:53+00:00February 14th, 2019|Research, Sports Health & Fitness|Comments Off on Biomechanical Comparison of “Dead” and “New” Pointe Shoes in Female Professional Ballet Dancers

Assessing the Dietary Quality and Health Status among Division 1 College Athletes at Moderate Altitude

Authors: Jay T. Sutliffe, Julia C. Gardner, Jenny M. Gormley, Mary Jo. Carnot, and Alison Adams

Corresponding Author:
Jay Sutliffe, PhD, RD
PO Box 15095
Flagstaff AZ, 86011
Jay.sutliffe@nau.edu
928-523-7596

Jay T. Sutliffe is Associate Professor of Nutrition and Foods and the Director of the PRANDIAL Lab at Northern Arizona University in Flagstaff, AZ; Julia C. Gardner is a research coordinator with the PRANDIAL Lab at Northern Arizona University; Mary Jo Carnot is professor of Counseling, Psychological Sciences, and Social Work at Chadron State College in Chadron, NE.; Jenny M. Gormley is a research assistant and student at Northern Arizona University; Alison Adams, is Professor of Biology at Northern Arizona University.

Assessing the Dietary Quality and Health Status Among Division 1 College Athletes at Moderate Altitude

ABSTRACT

Student-athletes’ dietary habits are ingrained in a complex interaction as they seek to maintain the balance between student and athlete. Assessing the dietary habits and lifestyle factors associated with this highly demanding population is the focus of this study. Eighty-nine Division I Collegiate Athletes was assessed (age 19.84 ± 1.15 yr). Measurements included diet quality, body composition, blood lipid profiling, and wellness factors. Significant deficiencies in Vitamin D (football 6.68 ± 5.84; basketball 4.33 ± 3.17; swim/dive 4 ± 2.97; volleyball 4.07 ± 2.97) and Omega 3-EPA & DHA (football 125.84 ± 301.03; basketball 53.92 ± 48.05; swim/dive 29.45 ± 35.83; volleyball 42.79 ± 30.77), Calcium (swim/dive 1083.55 ± 437.88), and Potassium (swim/dive 1083.55 ± 437.88) were reported. All teams exhibited an energy deficit, however, the highest energy deficit was for football (-843.57 calories). All teams had higher than recommended levels of perceived stress, averaging 20.63, and swim/dive had higher levels of depressive symptoms (6.17 ± 3.30). All teams reported poor sleep quality, averaging 7.20. This assessment indicates variability in dietary quality and wellness factors among individuals and teams. Individualized guidelines should be recommended for those experiencing food intake challenges such as the unique needs of moderate altitude athletes.

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2019-01-31T14:42:08+00:00February 7th, 2019|Research, Sports Health & Fitness|Comments Off on Assessing the Dietary Quality and Health Status among Division 1 College Athletes at Moderate Altitude

Evaluation of Possible Anthropometric Advantage in Sit-Up Test

Authors: David Peterson, Meighan Middleton, and Sharon Christman

Corresponding Author:
David D. Peterson, EdD, CSCS*D
Cedarville University
251 N. Main St.
Cedarville, OH 45314
ddpeterson@cedarville.edu
(937) 766-7761

Dr. Peterson is an associate professor of kinesiology at Cedarville University (CU) and currently serves as the Director of the Multi-Age Physical Education (MAPE) program at CU.

Evaluation of Possible Anthropometric Advantage in Sit-Up Test

ABSTRACT

The U.S. Navy currently employs sit-ups as part of its semi-annual physical fitness in order to assess the abdominal muscular endurance of service-members.  However, there is speculation that sit-up performance may be associated with anthropometric proportions thereby affording certain service-members with a biomechanical advantage.  To test this theory, anthropometric measurements were taken at various sites (i.e., humerus, torso, femur, and tibia) across a convenience sample of 69 participants (37 male / 32 female), to include student, active duty, and retired military personnel from the United States Naval Academy.  Humerus length (r = .297), tibia length (r = .385) and sex (r = .314) were all found to be moderately correlated with sit-up performance.  These findings, coupled with well-documented concerns of the sit-ups in terms of safety and relevance in the literature, make a compelling argument for the identification and implementation of other potential field tests to assess abdominal muscular endurance.

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2019-02-04T08:46:29+00:00January 31st, 2019|Research, Sports Health & Fitness|Comments Off on Evaluation of Possible Anthropometric Advantage in Sit-Up Test

Movement Competency Screen Predicts Performance in Female Military Academy Recruits

Authors: Alex M. Warshaw1, David D. Peterson2, Sharon M. Henry1
1 Rehabilitation and Movement Science Department, University of Vermont, Burlington, VT, USA
2 Kinesiology and Allied Health Department, Cedarville University, Cedarville, OH, USA

Corresponding Author:
David D. Peterson, EdD, CSCS*D
Cedarville University
251 N. Main Street
Cedarville, OH 45314
ddpeterson@cedarville.edu
(937) 766-7761

Dr. Peterson is an associate professor of kinesiology at Cedarville University (CU) and currently serves as the Director of the Multi-Age Physical Education (MAPE) program at CU.

Movement Competency Screen Predicts Performance in Female Military Academy Recruits

ABSTRACT
Musculoskeletal injuries in military populations are a leading cause for reduced physical readiness (15). Utilizing a screening tool that predicts physical performance and injuries could help identify recruits who need remedial training or conditioning. The Movement Competency Screen (MCS) identifies poor movement patterns and suggests safe load levels for individuals (8). This study sought to establish the predictive ability of the MCS for injuries and performance in United States Naval Academy (USNA) recruits over four years. Fifteen female and 26 male recruits completed the MCS upon entry into the academy. The recruits’ Physical Readiness Test (PRT) scores and injury data were collected for eight semesters. Correlations between MCS scores and recruits’ number of injuries, missed “duty days”, and region of injury were identified using Pearson correlation coefficients. Additionally, correlations between MCS scores and recruits’ overall PRT score, number of push-ups, curl-ups, and their 1.5-mile run time were calculated. Within the first year at USNA recruits’ MCS scores correlated with the number of injuries and missed “duty days”; however, this correlation was not sustained. Recruits also experienced the most injuries in the first year. For female recruits, higher MCS scores correlated with better PRT scores, number of push-ups, and 1.5 mile run times. With its high inter- and intra-rater reliability (12), the MCS could be used to identify poor movement patterns and guide remedial training to help prevent future injury. Further research should focus on a larger military population to determine if the MCS’s predictive abilities go beyond a military academy population.
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2018-10-23T16:39:58+00:00November 1st, 2018|Research, Sports Health & Fitness|Comments Off on Movement Competency Screen Predicts Performance in Female Military Academy Recruits

Fitness and Health Center Evaluation by Resigned Female Members

Authors: Dr. George F. Zarotis

Corresponding Author:
Dr. George F. Zarotis
Von-Andreae-Str. 1
51427 Bergisch Gladbach, Germany
E-Mail: drgzarotis@t-online.de, E-Mail: zarotisg@rhodes.aegean.gr

Dr. George F. Zarotis studied sports science at the German Sport University Cologne, prevention and rehabilitation through sport at the Ruhr-University Bochum (Master Degree) and sports economics and sports management at the Open University Hagen; Doctorate in the subjects of leisure science and rehabilitation at the German Sport University Cologne (PhD), Lecturer at the Institute for European Sports Development and Leisure Research of the German Sport University Cologne and at the University of Applied Sciences for Applied Management in Unna; since 2004 lecturer at the Faculty for Human Sciences of the Aegean University in Rhodes/Greece.

Fitness and Health Center Evaluation by Resigned Female Members

ABSTRACT
In the evaluations and statistical analyses presented here we examine the question to what extent are the evaluations of a fitness studio, by females dropping out from their contract, age-dependent. In other words: do studio evaluations – that probably have played a role in the quitting decision – have a different basis in older women in relation to younger women? According to the life stages, do other needs and therefore other preferences regarding the studio conditions play a role here?

A total of 164 women, who had terminated their contract with a fitness studio, were questioned. The survey was conducted as a telephone inquiry about their actual decision. Overall, it is found that only a few of the reasons offered in the survey are also indicated in significant frequency as important for the quitting decision. On the whole, the various aspects of the studio offer and its surroundings were largely rated as “good”, the mean values range around the value 2. The respondents particularly expressed their appreciation for the trainers (friendliness, helpfulness, competence), followed by opening hours, trial training and first impression. The membership costs and individual aspects such as spaciousness, music and ventilation are evaluated more critically, if not really badly. As regards the respondents’ age, there are only minor evaluation differences among the age categories.

These small differences in age have, depending on the item evaluated, very different directions. The correlations between age and studio evaluation are usually weak up to practically non-existent and in most cases also clearly not significant. Weak but distinguished from chance effects appear in the characteristics endurance training offer and parking facilities.
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2018-07-23T09:29:39+00:00August 23rd, 2018|Commentary, Sports Health & Fitness|Comments Off on Fitness and Health Center Evaluation by Resigned Female Members