Introduction. In sport technique studies, motion features can be useful as they have a certain defined measure . In this work, we examined the following three features: the structure of the movement (all the characteristics of the movement), the fluency of the movement, and the rhythm of the movement. The aim of the study was to determine the usefulness of the selected movement features in the evaluation of the flat bench press. The protocol of the study included a flat bench press with free weights and a “touch-and-go” technique. Material and methods. The study involved twenty healthy men; however, only two were selected for analysis. The first subject was a 25-year-old powerlifter (body mass = 95 kg; body height = 182 cm; 1-RM in flat bench press = 145 kg). The second one was a 25-year-old bodybuilder (body mass = 77 kg; body height = 175 cm; 1-RM in flat bench press = 100 kg). The subjects performed consecutive sets of a single repetition of flat bench pressing with an increasing load (70, 80, 90, and 100% 1-RM, with the anticipated maximum weight), until the completion of one repetition maximum. Multidimensional movement analysis was made with the measuring system Smart-E (BTS, Italy), which consisted of six infrared cameras (120 Hz) and a wireless module to measure muscle bioelectric activity (Pocket EMG). Results. It was demonstrated that the internal structure of the bench press performed by the bodybuilder and the powerlifter was different. As the time-history of barbell kinematics (the acceleration-time curve) showed, with increased loading of the barbell, the rhythm of the flat bench press changed, and the fluidity of the movement worsened.
1. Król H., Mynarski W. (2005). Movement features - characteristics and parametrisation. Katowice: AWF. [in Polish]
2. Schnabel G. (1998). General movement characteristics as an expression of movement coordination (12th ed.). In K. Meinel, G. Schnabel (eds.), Teaching of movement: Sport motorics (pp. 90-170). Berlin: Volk u. Wissen Volkseigener Verlag. [in German]
3. Król H., Gołaś A. (2017). Effect of barbell weight on the structure of the flat bench press. Journal of Strength and Conditioning Research 31(5), 1321-1337.
4. Baechle T.R., Earle R.W., Wathen D. (2008). Resistance training. In T.R. Baechle, R.W. Earle (eds.), Essentials of strength training and conditioning (pp. 381-412). Champaign, IL, USA: Human Kinetics.
5. Freriks B., Hermens H.J. (1999). SENIAM 9: European Recommendations for Surface ElectroMyoGraphy, results of the SENIAM project. Roessingh Research and Development b.v. (CD-rom).
6. Schneider K. (1990). The acceleration effort as the quantitative description of the motion flow. Sportwissenschaft 2, (pp. 192-199) Schorndorf, Germany: Hofmann. [in German]
7. Elliott B.C., Wilson G.J., Kerr G.K. (1989). A biomechanical analysis of the sticking region in the bench press. Medicine and Science in Sports and Exercise 21, 450-462.
8. McCaw S.T., Friday J.J. (1994). A comparison of muscle activity between a free weight and machine bench press. Journal of Strength and Conditioning Research 8, 259-264.
9. Anaderson K.G., Behm D.G. (2004). Maintenance of EMG activity and loss of force output with instability. Journal of Strength and Conditioning Research 18, 637-640.
10. Santana J.C., Vera-Garcia F.J., McGill S.M. (2007). A kinetic and electromyographic comparison of the standing cable press and bench press. Journal of Strength and Conditioning Research 21, 1271-1279.
11. Król H., Kmiecik K. (2016). Kinematics of the barbell during the flat bench press in a bodybuilder and a powerlifter. In K.J. Słomka, G. Juras (eds.), Current research in motor control V (pp. 136-148). Katowice: Jerzy Kukuczka Academy of Physical Education in Katowice.
12. Van den Tillaar R., Ettema G. (2009). A comparison of successful and unsuccessful attempts in maximal bench pressing. Medicine and Science in Sports and Exercise 41, 2056-2063.
13. Van den Tillaar R., Ettema G. (2013). A comparison of muscle activity in concentric and counter movement maximum bench press. Journal of Human Kinetics 38, 63-71.
14. Pearson S.N., Cronin J.B., Hume P.A., Slyfield D. (2009). Kinematics and kinetics of the bench - press and bench - pull exercises in a strength - trained sporting population. Sport Biomechanics 8, 245-254.