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

February 14th, 2019|Research, Sports Health & Fitness|

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

February 7th, 2019|Research, Sports Health & Fitness|

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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Evaluation of Possible Anthropometric Advantage in Sit-Up Test

January 31st, 2019|Research, Sports Health & Fitness|

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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NBA Referee Missed Calls: Reasons and Solutions

January 24th, 2019|Commentary, Sports Management|

Authors: Kevin Sigler

Corresponding Author:
Kevin Sigler, PhD
601 College Road
Department of Economics and Finance
Cameron School of Business
UNC Wilmington
Wilmington, NC 28403
siglerk@uncw.edu
910-200-2076

Kevin Sigler is Professor of Finance in the Cameron School of Business, UNC Wilmington

NBA Referee Missed Calls: Reasons and Solutions

ABSTRACT

This paper examines officiating in the NBA to determine if it has kept pace with the changes to the game.  This research concludes that since the game is so fast now with athletes that are bigger, stronger and faster than any time in NBA history, NBA officiating should consider changing as well.   Some possible modifications are adding more referees, allowing each official to sit out a portion of the game while being replaced by a fresh alternate, and using more cameras with referees viewing them remotely.

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Study on professional football players – factors in recovery and preparation and performance markers during scheduled training session

January 17th, 2019|Research, Sports Studies and Sports Psychology|

Authors:Tatyana Dzimbova, Hristo Nikolov, Radoslav Mavrevski, Stefan Kapralov

Corresponding Author:
Assoc. prof. Tatyana Dzimbova, PhD
66 Ivan Michailov Str.
Blagoevgrad, 2700 Bulgaria
tania_dzimbova@abv.bg
+359898939285

Study on professional football players – factors in recovery and preparation and performance markers during scheduled training session

ABSTRACT

Purpose. The purpose of the present study is to estimate if the athletes can satisfy their energy needs by diet, if they are well hydrated before training, and if the training is effective.

Methods. Ten players of the football team in the B professional league participated in the study (age 23.44 ± 5.98 years, weight 70.64 ± 4.57 kg, height 176.4 ± 7.35 cm; ±SD). Their body composition was analyzed with the Body Composition Analyzer IoI 353 and they completed food questionnaires. Blood lactate concentrations were determined using the biochemical analyzer BIOSEN – C Line, EKF Diagnostic. The heart rates of the subjects are recorded using the activePULS, MEDION AG. Data was processed using SPSS and Graphpad Prism software.

Results. According to the data obtained from the food questionnaires all subjects received the necessary amount of energy to fully meet their energy needs. From the multiple linear regression, it is seen that the highest value has the standardized coefficient in front of the carbohydrate intake which means that it has the greatest influence (about 65%) on total energy intake. The heart rates of participants in the study range from 78 to 90% of the predicted maximum, i.e., high intensity. Differences in blood lactate concentration before and after exercise are significant, evidence of effective performance on training.

Conclusions. We can conclude that according to the nutrition questionnaire the athletes received a sufficient amount of macronutrients and sufficient amount of energy for their training needs. The change in blood lactate concentrations and heart rate during training is indicative of the responsible attitude of the players, and therefore the target endurance is most likely to be achieved.

Applications in Sport. Reported methods could be a useful tool for coaches to track the recovery and preparation of the athletes in season and to evaluate their performance during a scheduled training session.

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