Vol. 15, Issue 1, december 2019.




Borko Petrović1, Aleksandar Kukrić1, Radenko Dobraš1 & Nemanja Zlojutro1
1University of Banja Luka, Faculty of physical education and sport, Bosnia &Hercegovina

Original scientific paper
doi: 10.5550/sgia.191501.en.pkdz
UDK: 796.015.52



This research aimed to determine whether the manifestation of maximum isometric muscle force at a certain joint angle (80°, 110°, and 140°) can act as a predictor of 1-RM in a leg press movement task. The research was carried out in a group of twenty-four (N=24) male students, within two separated sessions, with seven days of rest between each.  The anthropometric measurements and muscle force assessment that is 1-RM, was executed through the training-to-failure method on a leg press machine (leg press, V-Gym Croatia) in the first session. Maximum isometric force (Fmax) of leg muscles was measured using maximum consecutive contractions test, in the laboratory conditions, on leg press machine with the help of dynamometer probe and Globus Ergo Tesys System 1000 software. Having analyzed the results obtained on the linear regression basis, the authors have, with 84,5% precision, inferred that it is possible to assess 1-RM in leg press exercise based on maximum isometric force exerted at the angle of the knee joint of 140°. The results attained may be applied in practice when assessing 1-RM, based on maximum isometric force measurement for a given movement task.

Key words: muscle force, prediction, 1RM, leg press

FULL TEXT (.pdf)



Agre, J.C., Casal, D.C., Leon, A.S. (1988): Professional ice hockey players:physiologic, antropometric,and musculoskeletal characteristics.Arch Phys Med Rehab 69: 188-92.
Bazyler C.D., Beckham, G.K., Sato, K. The use of the isometric squat as a measure of strength and explosiveness. J Strength Cond Res, 2015; 29: 1386-1392.
Bemben, M.G.; Murphy R.E. (2001): Age related neural adaptacion following short term resistance training in vomen. J Sport Med Phys Fitness 41: 291-9.
Brzycki, M (1993). Strength Testing – Predicting a One-Rep Max. from Reps-to-Fatigue. J. Phys. Edu. Rec. Dance, 64(1): 88-90.
Drake D, Kennedy R, Wallace E (2017): The validity and responsiveness of isometric lower body multi-joint tests of muscular strength: a systematic review. Sports Med Open 3(1):23.
PMid:28631257 PMCid:PMC5476535
Gore, C.J. (2000). Physiological tests for elite athletes”. Australian Sports Commission. Champaign, IL: Human Kinetics. USA.
Ivanović, J. & Dopsaj, M. (2013). Reliability of force–time curve characteristics during maximal
            isometric leg press in differently trained high-level athletes.Measurement 46, str. 2146–2154.
Juneja H, Verma SK, Khanna GL. (2010):0 Isometric strength and its relationship to dynamic performance: a systematic review, Journal of Exercise Science and Physiotherapy, Vol. 6, No. 2: 60-69.
Lewis, C.L, Spitler, D.L. (1989):  Effect of tibial rotation on mesure of strength and endurance of the knee. JApp Sport Sci Res, 1989; 3: 19-22.
Papadopoulos C, Kalapotharakos V I, Chimonidis E, Gantiraga E, Grezios A, Gissis I. (2008): Effects of knee angle on lower extremity extension force and activation time characteristics of selected thigh muscles. Isokinetics and Exercise Science. 16, 41-46.
Papadopoulos C, Theodosiou K, Noussios G, Gantiraga E, Meliggas K, Sambanis M, Gissis I. (2012): Evidence for validity and reliability of Multiarticular leg extension machine. International Journal of Applied Science and Technology. 2(8); 10-19.
Parai M, Shenoy PD, Velayutham S, Seng CK, Yip CY (2016): Isometric muscle strength as a predictor of one repetition maximum in healthy adult females: a crossover trial. ClinTranslOrthop 1(2):71-78. [CrossRef]
Poulmedis, P. (1985): Isokinetic maximal torque power of greek elite soccer players. J Orthop Sports Phys Ther, 1985; 6: 293-5.
Sale, D.G., Norman R.W. (1991):Testing strength and power. In MacDougal HA, Wenger HA.
Smidtbleicher,  D.  (1992): Training for power events.  In: Strength and Power in Sport
            P. V.  Komi,  ed.  London: Blackwell Scientific Publications,  str.  381-395.
Spairani, L., Barbero, M., Cescon, C., Combi, F., Gemelli, T., Giovanetti, G., et al. (2012). An electromyographic study of the vastii muscles during open and closed kinetic chain submaximal isometric exercises. Int. J. Sports Phys. Ther. 7, 617–626.
Ugarković, D. (1996): Biologija razvoja čovjeka sa osnovama sportske medicine. Fakultet fizičke kulture, Beograd.
Vilijanen, T., Vitasalo, J.T. & Kujala, U.M. (1991): Strength characteristics of a healthy urban adult population. Europen journal of applied physiology, 63: 43-47.
Wilson, G.J. and A.J. Murphy (1996):The use of isometric tests of muscular function in athletic assessment. Review. Sports Med. 22(1): 19-37.
Zaciorski, V.M.; Kremer ,W.J.(2009): Nauka i praksa u treningu snage. Datastatus. Beograd.


To cite this article:
Petrović, B., Kukrić, A., Dobraš, R., & Zlojutro, N. (2019). Isometric muscle force as a predictor of a maximal muscle effort in the leg press test. Sportlogia 15 (1), 81-89.



Received: 28.10.2019.
Accepted: 06.11.2019.

Prof. dr Borko Petrović
University of Banja Luka,
Faculty of physical education and sport,
Bosnia &Hercegovina