The strike force in combat sports strongly depends on the protective material's mechanical properties and energy absorption capacity. Therefore, this study aimed to estimate the effect of the protective layer thickness and repeated loading on the net force in a falling weight impact test. A falling 8-kg weight dropped from 15 cm, 25 cm, and 50 cm was used to simulate impact peak forces in an upper limb strike. Transfer linear regression functions were identified for three layers of different thickness (1.8 cm, 3.6 cm, and 5.4 cm) between the measured force and undamped force that would be measured if no protective layer was used. A decrease in damping performance under repetitive loading was assessed for the same amount of energy (30 J) absorbed by the specimens. There were 36 specimens examined in 126 tests. When the measuring apparatus was covered with one, two or three layers of Trocellen foam, the undamped force was approximately 2.8, 6.1, and 11.1 times higher, respectively (p < 0.05, R2 ≥ 0.95), than the force measured in the kinetic design. This allows researchers to select the number of layers according to the individual needs in terms of safety and injury prevention. A single layer of Trocellen foam used in this study may be insufficient to ensure the safety of athletes in upper limb strike experiments due to possible compaction of the foam structure for deformations exceeding 80% compression and forces exceeding 5 kN, although no injury was previously observed.

Biomechanical Human Body Models New Technologies Research Centre University of West Bohemia Pilsen Czech Republic

Department of Human Motor Behavior Institute of Sport Sciences Jerzy Kukuczka Academy of Physical Education in Katowice Katowice Poland

Department of Mechanics Faculty of Applied Sciences University of West Bohemia Pilsen Czech Republic

Department of Rehabilitation Fields Faculty of Health Care Studies University of West Bohemia Pilsen Czech Republic

Department of Sports Games Faculty of Physical Education and Sport Charles University Prague Czech Republic

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Abrahams, S., Fie, S. M., Patricios, J., Posthumus, M., & September, A. V. (2014). Risk factors for sports concussion: An evidence-based systematic review. British Journal of Sports Medicine, 48(2), 91–97. 10.1136/bjsports-2013-092734 PubMed DOI

Adamec, J., Hofer, P., Pittner, S., Monticelli, F., Graw, M., & Schöpfer, J. (2021). Biomechanical assessment of various punching techniques. International Journal of Legal Medicine, 135(3), 853–859. 10.1007/s00414-020-02440-8 PubMed DOI PMC

Ambroży, T., Rydzik, Ł., Spieszny, M., Chwała, W., Jaszczur-Nowicki, J., Jekiełek, M., Görner, K., Ostrowski, A., & Cynarski, W. J. (2021). Evaluation of the level of technical and tactical skills and its relationships with aerobic capacity and special fitness in elite ju jitsu athletes. International Journal of Environmental Research and Public Health, 18(23), 12286. 10.3390/ijerph182312286 PubMed DOI PMC

ASTM Committee D11 on Rubber and Rubber-like Materials . Subcommittee D11. 10 on Physical Testing. Standard test methods for rubber properties in compression. ASTM International, 2018. https://www.astm.org/; accessed on 06 March 2023

Atha, J., Yeadon, M. R., Sandover, J., & Parsons, K. C. (1985). The damaging punch. British Medical Journal (Clinical Research Ed.), 291(6511), 1756–1757. 10.1136/bmj.291.6511.1756 PubMed DOI PMC

Beranek, V., Votápek, P., & Stastny, P. (2020a). Force and velocity of impact during upper limb strikes in combat sports: A systematic review and meta-analysis. Sports Biomechanics, 22(8), 921–939. 10.1080/14763141.2020.1778075 PubMed DOI

Beranek, V., Stastny, P., Novacek, V., Votapek, P., & Formanek, J. (2020b). Upper Limb Strikes Reactive Forces in Mix Martial Art Athletes during Ground and Pound Tactics. International Journal of Environmental Research and Public Health, 17(21), 7782. 10.3390/ijerph17217782 PubMed DOI PMC

Beranek, V., Stastny, P., Turquier, F., Novacek, V., & Votapek, P. (2022). Analysis of the Contact Area for Three Types of Upper Limb Strikes. Journal of Functional Morphology and Kinesiology, 7(2), 50. 10.3390/jfmk7020050 PubMed DOI PMC

Bergün, M., Bulgan, C., Aydin, M., & Bal, E. (2017). The effects of impact forces and kinematics of two different stances at straight punch techniques in boxing. Archives of Budo Science of Martial Arts and Extreme Sports, 13, 35–39.

Bolander, R. P., Neto, O. P., & Bir, C. A. (2009). The effects of height and distance on the force production and acceleration in martial arts strikes. Journal of Sports Science & Medicine, 8(CSSI3), 47–52. PubMed PMC

Bruzas, V., Kamandulis, S., Venckunas, T., Snieckus, A., & Mockus, P. (2018). Effects of plyometric exercise training with external weights on punching ability of experienced amateur boxers. Journal of Sports Medicine and Physical Fitness, 58(3), 221–226. 10.23736/S0022-4707.16.06674-3 PubMed DOI

Buśko, K., Staniak, Z., Szark-Eckardt, M., Nikolaidis, P. T., Mazur-Różycka, J., Łach, P., Michalski, R., Gajewski, J., & Górski, M. (2016). Measuring the force of punches and kicks among combat sport athletes using a modified punching bag with an embedded accelerometer. Acta of Bioengineering and Biomechanics, 18(1), 47–54. PubMed

Bingul, M. B., Bulgan, C., Tore, O., Aydin, M., & Bal, E. (2017). The effects of impact forces and kinematics of two different stance at straight punch techniques in boxing. Archives of Budo Science of Martial Arts and Extreme Sport, 13, 35–39.

Cesari, P. & Bertucco, M. (2008). Coupling between punch efficacy and body stability for elite karate. Journal of Science & Medicine in Sport, 11, 353–356. 10.1016/j.jsams.2007.05.007 PubMed DOI

Cournoyer, J., & Hoshizaki, T. B. (2019). Head dynamic response and brain tissue deformation for boxing punches with and without loss of consciousness. Clinical Biomechanics (Bristol, Avon), 67, 96–101. 10.1016/j.clinbiomech.2019.05.003 PubMed DOI

Culeddu, M. P. (2018). The Evolution of the Ancient Way of the Warrior: From the Ancient Chronicles to the Tokugawa Period. Asian Studies, 6(2), 87–109. 10.4312/as.2018.6.2.87-109 DOI

Čepulenas, A., Bružas, V., Mockus, P., & Subačius, V. (2011). Impact of physical training mesocycle on athletic and specific fitness of elite boxers. Archives of Budo, 7, 33–39.

Cholewa J, Gorzkowska A, Kunicki M, Stanula A, Cholewa J. (2016). Continuation of full time employment as an inhibiting factor in Parkinson's disease symptoms. Work, 54(3), 569-575. doi:10.3233/WOR-162305 PubMed DOI

de Souza, V. A., & Mattos, A. (2017). Relationship between age and expertise with the maximum impact force of a reverse punch by shotokan karate athletes. Archives of Budo, 13, 243–254. doi:10.2466/05.25.PMS.112.2.639-648 DOI

Daniel, T. M., & Răzvan-Liviu, P. (2014). Correlation between plantar pressure and striking speed in karate-do. Procedia-Social and Behavioral Sciences, 117, 357–360.

Droščák, P. (2017). Měření síly úderové techniky v kjókušinkai karate (English: Hitting power measurement in Kyokushinkai Karate). Studia Sportiva, 11(1), 199–208. 10.5817/StS2017-1-37 DOI

Dyson, R., Smith, M., Fenn, L., & Martin, C. (2005). Differences in lead and rear hand punching forces, delivered at maximal speed relative to maximal force, by amateur boxers. ISBS - Conference Proceedings Archive. https://ojs.ub.uni-konstanz.de/cpa/article/view/1166; accessed on: 06 March 2023

N 1621-2:2013, Motorcyclists' Protective Clothing against Mechanical Impact-Part 2: Motorcyclists'’ Back Protectors-Requirements and Test Methods for Impact Protectors, UNI EN 1621-2:2013 EN 12503-1:2013 British Standards Institution. Sports Mats, Part 1: Gymnastic Mats, Safety Requirements; British Standards Institution: London, UK, 2013.

Estevan, I., Alvarez, O., Falco, C., Molina-García, J. & Castillo, I. (2011). Impact force and time analysis influenced by execution distance in a roundhouse kick to the head in taekwondo. Journal of Strength & Conditioning Research, 25(10), 2851–2856. 10.1519/JSC.0b013e318207ef72 PubMed DOI

Falco, C., Alvarez, O., Castillo, I., Estevan, I., Martos, J., Mugarra, F. & Iradi, A. (2009). Influence of the distance in a roundhousekick's execution time and impact force in Taekwondo. Journal of Biomechanics, 42(3), 242–248. 10.1016/j.jbiomech.2008.10.041 PubMed DOI

Folhes, O., Reis, V. M., Marques, D. L., Neiva, H. P., Marques, M. C. (2023). Influence of the Competitive Level and Weight Class on Technical Performance and Physiological and Psychophysiological Responses during Simulated Mixed Martial Arts Fights: A Preliminary Study. Journal of Human Kinetics, 86, 205–215. 10.5114/jhk/159453 PubMed DOI PMC

Follmer, B., Dellagrana, R. A., & Zehr, E. P. (2019). Head Trauma Exposure in Mixed Martial Arts Varies According to Sex and Weight Class. Sports Health, 11(3), 280–285. 10.1177/1941738119827966 PubMed DOI PMC

Gavagan, C. J. & Sayers, M. G. L. (2017). A biomechanical analysis of the roundhouse kicking technique of expert practitionerscomparison between the martial arts disciplines of Muay Thai, Karate, and Taekwondo. PLoS ONE, 12(8), e0182645. 10.1371/journal.pone.0182645 PubMed DOI PMC

Gianino, C. (2010). Physics of Karate: Kinematics analysis of karate techniques by a digital movie camera. Latin-American Journal of Physics Education, 4(1), 5.

Gupta, S. (2011). The attenuation of strike acceleration with the use of safety equipment in tae kwon do. Asian Journal of Sports Medicine, 2(4), 235. PubMed PMC

Halperin, I., Chapman, D. W., Martin, D. T., & Abbiss, C. (2017a). The effects of attentional focus instructions on punching velocity and impact forces among trained combat athletes. Journal of Sports Sciences, 35(5), 500–507. 10.1080/02640414.2016.1175651 PubMed DOI

Halperin, I., Chapman, D. W., Martin, D. T., Lewthwaite, R., & Wulf, G. (2017b). Choices enhance punching performance of competitive kickboxers. Psychological Research, 81(5), 1051–1058. 10.1007/s00426-016-0790-1 PubMed DOI

House, P. D., & Cowan, J. L. (2015). Predicting Straight Punch Force of Impact. Journal of the Oklahoma Association for Health, Physical Education, Recreation, and Dance, 53(1), 1. http://156.110.192.75/ojs-2.4.8/index.php/oahperd/article/view/6296

Hynčík, L., Kochová, P., Špička, J., Bońkowski, T., Cimrman, R., Kaňáková, S., Kottner, R., & Pašek, M. (2021). Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications. Polymers, 13(10), 1535. 10.3390/polym13101537 PubMed DOI PMC

Chadli, S., Ababou, N., & Ababou, A. (2014). A New Instrument for Punch Analysis in Boxing. Procedia Engineering, 72, 411–416. 10.1016/j.proeng.2014.06.073 DOI

Cheraghi, M. H., Agha, A., Reza, A. & Shirzad, E. (2014). Kinematics of straight right punch in boxing. Annals of Applied Sport Science, 2, 39–50. https://doi:10.18869/acadpub.aassjournal.2.%202.%2039 DOI

Chang, W. G., Lin, K. Y., Chu, M. Y. & Chow, T. H. (2021). Differences in Pivot Leg Kinematics and Electromyography Activation in Various Round House Kicking Heights. Journal of Sports Science and Medicine, 20(3), 457–465. 10.52082/jssm.2021.457 PubMed DOI PMC

Chiu, H. T., & Shiang, T. Y. (1999). A new approach to evaluate karate punch techniques. International Society of Biomechanics Conference Proceedings Archive, 17. International Symposium on Biomechanics in Sports June 30–July 06, 1999, Perth, Western Australia, 61–64. https://ojs.ub.uni-konstanz.de/cpa/article/view/4052

Kolupaeva, S., & Semenov, M. (2015). The stored energy of plastic deformation in crystals of face- centered cubic metals. IOP Conference Series: Materials Science and Engineering, 71(1), 012077. 10.1088/1757-899X/71/1/012077 DOI

Kottner, R., Bońkowski, T., & Kaňáková, S. (2019). Experimental Investigation of Foams Suitable for Motorcycle Protectors. Journal of Mechanics of Continua and Mathematical Sciences, 4, 58–69. 10.26782/jmcms.spl.4/2019.11.00007 DOI

Kottner, R., Kaňáková, S., Bońkowski, T., Yeung, R., & Pukaro, A. (2020). Improvement of impact protection by KORDCARBON-CPREG-200-T-3K-EP1-4-A composite. Materials Today: Proceedings, 32, 68–71. 10.1016/j.matpr.2020.02.084 DOI

Kimm, D., & Thiel, D. V. (2015). Hand speed measurements in boxing. Procedia Engineering, 112, 502–506. 10.1016/j.proeng.2015.07.232 DOI

Lenetsky, S., Harris, N., & Brughelli, M. (2013). Assessment and contributors of punching forces in combat sportsathletes: Implications for strength and conditioning. Strength and Conditioning Journal, 35(2), 1–7.

Lockwood, J., Frape, L., Lin, S., & Ackery, A. (2018). Traumatic brain injuries in mixed martial arts: A systematic review. Trauma, 20(4), 245–254. 10.1177/1460408617740902 DOI

Loturco, I., Nakamura, F. Y., Artioli, G. G., Kobal, R., Kitamura, K., Cal Abad, C. C., Cruz, I. F., Romano, F., Pereira, L. A., & Franchini, E. (2016). Strength and Power Qualities Are Highly Associated With Punching Impact in Elite Amateur Boxers. Journal of Strength & Conditioning Research, 30(1), 109–116. 10.1519/JSC.0000000000001075 PubMed DOI

Lyn, G., & Mills, N. J. (2001). Design of foam crash mats for head impact protection. Sports Engineering, 4(3), 153–163. 10.1046/j.1460-2687.2001.00081.x DOI

Miarka, B., Dal Bello, F., Brito, C. J., Del Vecchio, F. B., Amtmann, J., & Chamari, K. (2019). A 12-Year Cohort Study of Doc-Stoppage in Professional Mixed Martial Arts. International Journal of Sports Physiology and Performance, 14(5), 606–611. 10.1123/ijspp.2017-0131 PubMed DOI

Mills, N. J. (2007). Polymer Foams Handbook: Engineering and Biomechanics Applications and Design Guide, Chapter 11-Micromechanics of closed-cell foams. In N. J. Mills (Ed.), Polymer Foams Handbook, 251–279. Oxford: Butterworth-Heinemann; 10.10.1016/B978-075068069-1/50012-X DOI

Moreira, S. P. V., de Paula, L. V. & Prieto, V. A. (2015). Segmental kick velocity is correlated with kick specific and nonspecific strength performance in a proximodistal sequence. Archives of Budo, 11, 271–283.

Nentwig, C., Steinhoff, S., Adamec, J., & Kunz, S. N. (2021). Head/skull injury potential of empty 0.5-l beer glass bottles vs. 0.33-l Coke bottles. International Journal of Legal Medicine, 135(5), 2091–2100. 10.1007/s00414-021-02562-7 PubMed DOI PMC

Neto, O. P., Bolander, R., Pacheco, M. T. T., & Bir, C. (2009). Force, reaction time, and precision of Kung Fu strikes. Perceptual and Motor Skills, 109(1), 295–303. 10.2466/PMS.109.1.295-303 PubMed DOI

Neto, O. P., Magini, M., Saba, M. M. F., & Pacheco, M. T. T. (2008). Comparison of force, power, and striking efficiency for a Kung Fu strike performed by novice and experienced practitioners: Preliminary analysis. Perceptual and Motor Skills, 106(1), 188–196. 10.2466/pms.106.1.188-196 PubMed DOI

Neto, O. P., Silva, J. H., Marzullo, A. C. de M., Bolander, R. P., & Bir, C. A. (2012). The effect of hand dominance on martial arts strikes. Human Movement Science, 31(4), 824–833. 10.1016/j.humov.2011.07.016 PubMed DOI PMC

O’Connor, K. L., Rowson, S., Duma, S. M., & Broglio, S. P. (2017). Head-Impact-Measurement Devices: A Systematic Review. Journal of Athletic Training, 52(3), 206–227. 10.4085/1062-6050.52.2.05 PubMed DOI PMC

Pędzich, W., Mastalerz, A., & Urbanik, C. (2006). The comparison of the dynamics of selected leg strokes in taekwondo WTF. Acta of Bioengineering and Biomechanics, 8, 83–90.

Pierce, J. D., Reinbold, K. A., Lyngard, B. C., Goldman, R. J., & Pastore, C. M. (2006). Direct Measurement of Punch Force During Six Professional Boxing Matches. Journal of Quantitative Analysis in Sports, 2(2), 1–19. 10.2202/1559-0410.1004 DOI

Preuschl, E., Hassmann, M., & Baca, A. A. (2016). Kinematic Analysis of the Jumping Front-Leg Axe-Kick in Taekwondo. Journal of Sports Science and Medicine, 15(1), 92–101. PubMed PMC

Rousseau, P., & Hoshizaki, T. B. (2015). Defining the effective impact mass of elbow and shoulder strikes in ice hockey. Sports Biomechanics, 14(1), 57–67. 10.1080/14763141.2015.1025236 PubMed DOI

Rinaldi, M., Nasr, Y., Atef, G., Bini, F., Varrecchia, T., Conte, C., Chini, G., Ranavolo, A., Draicchio, F., & Pierelli, F. (2018).Biomechanical characterization of the Junzuki karate punch: indexes of performance. European Journal of Sport Science, 18(6), 796–805. PubMed

Svoboda, M., Soukup, J., Jelen, K., & Kubový, P. (2016). Measurement of Force Impact Taekwondo Athletes, Assessing the Possibility of Injury of Human Head. Procedia Engineering, 136, 211–215. 10.1016/j.proeng.2016.01.199 DOI

Smith, P. K. (1986). Punching impact efect of the karate, boxing and the thumbless boxing glove. International Society of Biomechanics Conference Proceedings Archive, 4 International Symposium on Biomechanics in Sports July 06–10, 1986, Halifax, Canada, 57–61. https://ojs.ub.uni-konstanz.de/cpa/article/view/1519; accessed on: 08 March 2023

Tomin, M., & Kmetty, Á. (2021). Evaluating the cell structure-impact damping relation of cross-linked polyethylene foams by falling weight impact tests. Journal of Applied Polymer Science, 138(11), 1–12. 49999. 10.1002/app.49999 DOI

Tomin, M., & Kmetty, Á. (2022). Polymer foams as advanced energy absorbing materials for sports applications—A review. Journal of Applied Polymer Science, 139(9), 1–23. 51714. 10.1002/app.51714 DOI

Tong-Iam, R., Rachanavy, P., & Lawsirirat, C. (2017). Kinematic and Kinetic Analysis of Throwing a Straight Punch: The Role of Trunk Rotation in Delivering a Powerful Straight Punch. Journal of Physical Education and Sport, 17(4), 2538–2543. doi:10.7752/jpes.2017.04287 DOI

United World Wrestling, Regulations for the licensing of mats . (b.r.). 14 January 2023, https://uww.org/sites/default/files/media/document/reglt_homolog_tapis_a_new.pdf; accessed on: 08 March 2023

Vagner, M., Cleather, D., Kubovy, P., Hojka, V., & Stastny, P. (2022). Kinematic Determinants of Front Kick Dynamics Across Different Loading Conditions. Military Medicine, 187(1–2), e147–e153. 10.1093/milmed/usaa542 PubMed DOI

Vagner, M., Thiel, D., Jelen, K., Tomsovsky, L., Kubovy, P. & Tufano, J.J. (2018). Wearing ballistic and weighted vests increases front kick forces. Archives of Budo, 14, 231–237.

Wąsik, J. & Shan, G. (2015). Kinematics of the turning kick–measurements obtained in testing well-trained taekwon-do athletes. Archives of Budo, 11, 61–67.

Wąsik, J. (2011). Kinematic analysis of the side kick in Taekwon-do. Acta of Bioengineering and Biomechanics, 13(4), 71–75. PubMed

Walilko, T., Viano, D., & Bir, C. (2005). Biomechanics of the head for Olympic boxer punches to the face. British Journal of Sports Medicine, 39(10), 710–719. 10.1136/bjsm.2004.014126 PubMed DOI PMC