Enhancement of power in the concentric phase of the squat and jump: Between-athlete differences and sport-specific patterns

Erika Zemková, Tomáš Vilman, Alena Cepková, Marián Uvaček, Peter Olej, Jaromír Šimonek


This study compares the differences in peak and mean power in the acceleration, as well as over the entire concentric phase of jumps and squats performed with and without countermovement (i.e. delta power) in athletes of different specializations. The participants performed either barbell squats or barbell jumps with and without countermovement bearing a weight of 70% 1RM. Results identified a significantly higher delta mean power in the entire concentric phase of jumps than in squats for high jumpers (29.8%, p=0.009) and volleyball players (24.3%, p=0.027). More specifically, their values were significantly higher during jumps in indoor volleyball players but not in beach volleyball players. On the other hand, rock & roll performers exhibited a significantly higher delta mean power during squats than jumps (19.5%, p=0.034) but this was only evident in those who specialized in acrobatics as opposed to dance. However, the values did not differ significantly during either jumps or squats for hockey players (9.5%, p=0.424) and karate competitors (11.6%, p=0.331). A similar trend was observed for peak and mean power in the acceleration phase of jumps and squats. It may be concluded then, that enhancement of power in the concentric phase of jumps and squats bearing an external load, differs in athletes with diverse demands on the explosive strength of their lower limbs. For most athletes, jumping may be considered a more specific alternative for the estimation of the ability to utilize elastic energy during countermovement exercise, whereas for others it may be the squat.


Power output; Utilization of elastic energy; Weight-Lifting exercises


Avis, F. J., Toussaint, H. M., Huijing, P. A., & Van Ingen Schenau, G. J. (1986). Positive work as a function of eccentric load in maximal leg extension movements. European Journal of Applied Physiology, 55(5), 562‒568. https://doi.org/10.1007/BF00421653

Bobbert, M., Gerritsen, K., Litjens, M., & Van Soest, A. (1996). Why is countermovement jump height greater than squat jump height? Medicine and Science in Sports and Exercise, 28(11), 1402‒1413. https://doi.org/10.1097/00005768-199611000-00009

Bosco, C., Viitasalo, J. T., Komi, P. V., & Luhtanen, P. (1982). Combined effect of elastic energy and myoelectrical potentiation during stretch-shortening cycle exercise. Acta Physiologica Scandinavica, 114(4), 557‒565. https://doi.org/10.1111/j.1748-1716.1982.tb07024.x

Bosco, C., & Viitasalo, J. T. (1982). Potentiation of myoelectrical activity of human muscle in vertical jumps. Electromyography and Clinical Neurophysiology, 22(7), 549‒562.

Finni, T., Ikegawa, S., Lepola, V., & Komi, P. (2001). In vivo behavior of vastus lateralis muscle during dynamic performances. European Journal of Sport Science, 1(1), 1‒13. https://doi.org/10.1080/17461390100071101

Gažovič, O. (1995). Reliabilita stanovenia maximálnych parametrov sily pri tlaku na lavičke [Reliability of assessing of maximal parameters of strength during bench press]. 2nd Scientific Conference. Bratislava, Slovakia: Comenius University, 104‒108.

Harrison, A. J., Keane, S. P., & Coglan, J. (2004). Force-velocity relationship and stretch-shortening cycle function in sprint and endurance athletes. Journal of Strength and Conditioning Research, 18(3), 473–479. https://doi.org/10.1519/13163.1

Ishikawa, M., & Komi, P. V. (2004). Effects of different dropping intensities on fascicle and tendinous tissue behavior during stretch-shortening cycle exercise. Journal of Applied Physiology, 96(3), 848‒852. https://doi.org/10.1152/japplphysiol.00948.2003

Jennings, C. L., Viljoen, W., Durandt, J., & Lambert, M. I. (2005). The reliability of the FiTRO Dyne as a measure of muscle power. Journal of Strength and Conditioning Research, 19(4), 167‒171.

Komi, P. V., & Bosco, C. (1978). Utilisation of stored elastic energy in leg extensor muscles by men and women. Medicine and Science in Sports and Exercise, 10(4), 261‒265.

Komi, P. V. (1984). Physiological and biochemical correlates of muscle function: effects of muscle structure and stretch-shortening cycle on force and speed. Exercise and Sport Sciences Reviews, 12, 81‒121.

Komi, P. V., & Gollhofer, A. (1997). Stretch reflexes can have an important role in force enhancement during SSC exercise. Journal of Applied Biomechanics, 13(4), 451‒460. https://doi.org/10.1123/jab.13.4.451

Kyselovičová, O., & Zemková, E. (2010). Modified aerobic gymnastics routines in comparison with laboratory testing of maximal jumps. Sport Scientific & Practical Aspects, 7(1), 37‒40.

Ross, A., Leveritt, M., & Riek, S. (2001). Neural influences on sprint running: training adaptations and acute responses. Sports Medicine, 31(6), 409‒425. https://doi.org/10.2165/00007256-200131060-00002

Thys, H., Faraggiana, T., & Margaria, R. (1972). Utilization of muscle elasticity in exercise. Journal of Applied Physiology, 32(4), 491‒494. https://doi.org/10.1152/jappl.1972.32.4.491

Thys, H., Cavagna, T., & Margaria, R. (1975). The role played by elasticity in an exercise involving movements of small amplitude. Pflügers Archiv, 354(3), 281‒286. https://doi.org/10.1007/BF00584651

Van Ingen Schenau, G. J., Bobbert, M. F., & de Haan, A. (1997). Does elastic energy enhance work and efficiency in the stretch-shortening cycle? Journal of Applied Biomechanics,13(4), 389‒415. https://doi.org/10.1123/jab.13.4.389

Zatsiorsky, V. M., & Kraemer, W. J. (2006). Science and practice of strength training. Champaign, IL: Human Kinetics.

Zemková, E., & Dzurenková, D. (2004). Functional diagnostics of karate athletes. Kinesiologia Slovenica, 10(1), 57‒70.

Zemková, E., & Dzurenková, D. (2009). Functional diagnostics of jumping performance in rock and roll dancers. Acta Facultatis Educationis Physicae Universitatis Comenianae, XLIX(1), 63‒74.

Zemková, E., Ollé, G., & Hamar, D. (2011). Enhancement of power in concentric phase of closed chain exercises with different coordination demands. 12th International Conference of Sport Kinetics 2011 "Present and Future Research in the Science of Human Movement". Cracow, Poland: IASK, 145‒146.

Zemková, E., & Hamar, D. (2013). Utilization of elastic energy during weight exercises differs under stable and unstable conditions. The Journal of Sports Medicine and Physical Fitness, 53(2), 119‒129.

Zemková, E., Jeleň, M., Kováčiková, Z., Ollé, G., Vilman, T., & Hamar, D. (2014). Enhancement of peak and mean power in concentric phase of resistance exercises. Journal of Strength and Conditioning Research, 28(10), 2919‒2926. https://doi.org/10.1519/JSC.0000000000000517

Zemková, E., Jeleň, M., Kováčiková, Z., Ollé, G., Vilman, T., & Hamar, D. (2015). Reliability and methodological issues of power assessment during chest presses on unstable surface with different weights. The Journal of Sports Medicine and Physical Fitness, 55(9), 922‒930.

DOI: https://doi.org/10.14198/jhse.2017.121.03

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