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Poster De Conférence Année : 2021

Voluntary control of pelvic frontal rotations in belly dance experts

Résumé

Expert belly dancers performed a higher pelvis amplitude than in gait in the frontal plane [1][2]. Anatomical constraints could explain the posture effect on pelvis amplitude.  Dancers are able to separately control amplitudes of pelvic and upper-trunk oscillations, as the upper-trunk rotations amplitude (< 5 deg) were much smaller than the pelvis (≈ 18 deg).  Unpreventable coupling between trunk segments occured in all frequency conditions: frontal pelvic rotation induced transverse pelvic rotation, and there was a consistent antiphase pattern between transverse rotations of the pelvis and upper-trunk. These consistent patterns may be due to mechanical and/or anatomical factors, and could reflect the counterbalancing mechanism often described in gait analysis [3][4].  Coordination patterns between the pelvis and upper-trunk frontal rotations are frequency dependent: three stable patterns, inphase, out-of-phase, antiphase were equally distributed among participants at 1 Hz, while the antiphase pattern was predominant at 3 Hz.  Less temporal variation of pelvic oscillations was observed at 2 Hz than 1 Hz and 3 Hz; thus, 2 Hz could be close to a stable attractor according to the non-linear dynamical systems view. It could well be that pelvic movements performed at 2 Hz resemble a rhythmic movement, but still slow enough for a cycle-by-cycle control, while those performed at 1 Hz are more a succession of discrete movements.  Inter-individual differences emerged at 3 Hz. This frequency seemed more difficult to maintain for half of our participants, who naturally converged into either a higher or a lower frequency. In the non-linear dynamical systems view, 3 Hz could be located in an instability area between two stable attractors. According to Nugent et al. (2017), 3 Hz is a frequency threshold above which dancers spontaneously shift to another erector spinae muscle pattern [5].
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hal-04318333 , version 1 (01-12-2023)

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  • HAL Id : hal-04318333 , version 1

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Anne Tournillon, Isabelle A Siegler. Voluntary control of pelvic frontal rotations in belly dance experts. Neural control of movement, Apr 2021, Virtual conference, Canada. ⟨hal-04318333⟩
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