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2 Acta of Bioengineering and Biomechanics

2 2021

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How to teach safe landing after the jump? The use of biofeedback to minimize the shock forces generated in elements of modern dance

Gorwa Joanna, Michnik Robert, Nowakowska-Lipiec Katarzyna

Acta of Bioengineering and Biomechanics

2021

Vol. 23, no. 3

47--59

Purpose: The aim of the study was to assess the possible use of biofeedback (information on the course and values of ground reaction forces (GRF) during landing following the performance of a dance evolution) for training minimising impact loads after a jump in modern dance. Methods: The tests involved the analysis of a total of 60 expressive elements of modern dance performed by 5 soloists. The tests involved the recording of the vertical component of GRF (GRFz) vector using Kistler platform in the landing phase following the performance of modern dance jumps. The dancers performed the above-named jumps three times in successive tests: a reference test (without biofeedback) and the next two tests with biofeedback, after the obtainment of information about the vertical value of GRF. After each performance, the dancers watched a course of GRF and films showing the recorded landing phase. Results: Applying of a proposed didactic laboratory session led to: extension of contact time and of time preceding the obtainment of the maximum value of GRFz, reduction of the maximum values of the vertical components of the GRF, reduction of the loading rate of the ground reaction force, increase of an impulse of the vertical component of GRF in the entire stance phase and in the shock absorption phase. Conclusions: Proposed didactic laboratory session with biofeedback may result in the change of the post-jump shock absorption technique.

Assessment of the level of static and dynamic balance in healthy people, practicing selected Latin American dances

Bojanowska Marta, Trybulec Bartosz, Zyznawska Joanna, Barłowska-Trybulec Marta, Mańko Grzegorz

Acta of Bioengineering and Biomechanics

2021

Vol. 23, no. 3

61--68

Purpose: The balance, known as the ability to independently maintain the body in a certain position and return to the starting position, can be divided into static and dynamic balances. Social Latin American dances (salsa, bachata) require dancers to do a characteristic figure, however, they are not trained as intensively as dancing sports. The aim of the study was to assess the static and dynamic balances of dancers, who are regularly dancing those selected Latin American dances, by comparison with those who do not. Methods: The study was conducted among 34 dancers from a Krakow Dancing School and, 37 students of the Jagiellonian University, aged 21–35. A SIGMA balance platform was used to measure static and, the Y-Balance Test platform to assess dynamic balance. The Student’s T-test, MannWhitney U-test and Spearman’s rank correlation coefficient were used in statistical analysis. Results: There were neither significant differences between right and left lower limbs of dancers, nor between values of tilts on the YBT platform in both investigated groups. Non-dancers, however, showed a slightly higher positive correlation between the deviations in the sagittal and frontal planes and the surface area, as well as between the path length and the surface area on the SIGMA platform when compared to dancers. Conclusions: The level of dynamic and static balances of dancing people is similar, when compared to non-dancers. The influence of practicing Latin American dances on the sense of balance require further studies.