Comparison of two Qwan ki do punching techniques

François Le Failler, Olivier Massoutier, Charles Pontonnier, Franck Multon

► To cite this version:

François Le Failler, Olivier Massoutier, Charles Pontonnier, Franck Multon. Comparison of two Qwan ki do punching techniques. 2024 - Sport Physics conference, Dec 2024, Rennes, France. pp.1-1. hal-04826686

HAL Id: hal-04826686

https://inria.hal.science/hal-04826686v1

Submitted on 9 Dec 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Comparison of two Qwan ki do punching techniques

Le Failler F., Massoutier O., Pontonnier C. & Multon F.

Univ Rennes, CNRS, Inria, IRISA-UMR6974, M2S, 35042 Rennes
International QwanKiDo Federation IQKDF

franck.multon@inria.fr

Qwan Ki Do is derived from Chinese and Vietnamese martial arts, mixing many fighting techniques such as fists, feet, elbows, sweeps, scissors, projections, grabs, locks, self-defense. Technique efficiency is a constant debate, for which masters and coaches have insights and beliefs. In Qwan Ki Do, punching may be performed with a classical fist technique or with an anchoring on the ground through the feet. Coaches think that this latter technique, consisting in voluntary "pushing" on the ground, may be more efficient in terms of striking force and propagation.

<figure><img src="image_2.png" /><figcaption>Figure 1: a strike performed with anchoring and right and left ground reaction forces (GRF).</figcaption></figure>

To test this assumption, we defined an experimental protocol, consisting in striking an instrumented boxing pad, measuring striking force and pad acceleration, motion and ground reaction forces of the striker. 5 experienced (> 3 years) Qwan Ki Do practitioners were recruited to perform 4 series of 10 strikes (jab and cross, with and without anchoring). The anchoring technique was found to generate more power, particularly in the cross strike (p < 0.01). Additionally, a consistent finding across both punch types was that the center of mass was lower in the anchoring condition (p < 0.05). Additional results are investigated to understand the biomechanical adaptations related to the anchoring technique, and better describe its interest for the fighters.

## References

[1] Adamec, J., Hofer, P., Pittner, S., Monticelli, F., Graw, M., & Schöpfer, J., Int. J. Leg. Med. **135**(3), 853-859 (2021)

[2] Dunn, E. C., Humberstone, C. E., Iredale, K. F., & Blazevich, Trans. Sport Med. **2**(3), 146-152 (2019)