Vol 14, Issue 4

Different Barbell Height Positions Affect Maximal Isometric Deadlift Force and Subsequent Squat Jump Performance in Recreationally-Trained Men

June 15, 2021 - By 

Authors

Jonathan Montano, California State University, Northridge
Elizabeth Torossian, California State University, Northridge
Vincent G.F. Martinez, California State University, Northridge
Leran Lhanie, California State University, Northridge
Shahan Awakimian, California State University, Northridge
Charles Ricardo Lopes, Methodist University of Piracicaba
Priscyla N. Marchetti, California State University, Northridge
Paulo Henrique Marchetti, California State University, Northridge
International Journal of Exercise Science 14(4): 1247-1255, 2021.
DOI: 10.70252/TQPJ3955

Abstract

The primary purpose of this study is to examine the effect of two different deadlift barbell height positions on maximal isometric force and subsequent maximal squat jump performance in recreationally-trained men. Fifteen young, healthy, recreationally-trained men (age: 24.7 ± 3.5years, height: 177.1 ± 7.9cm, and total body mass: 81.2 ± 9.8kg) volunteered to participate. All participants performed maximal squat jumps (MSJ) at 90º of knee flexion before (pre-test) and after 4-min (post-test) performing the deadlift exercise using maximal isometric force (MIF) and MIF normalized by body mass (ratioMIF) in two barbell height positions (25% and 75% of the lower limb height, LLH) in a randomized and counterbalanced order. A paired-sample t-test was used to test differences in MIF and ratioMIF between 25% LLH and 75% LLH. Two-way ANOVAs were used for positions (25% LLH and 75% LLH) and time (pre- and post-test) for all dependent variables with an alpha of 5%. Differences were found for MIF and ratioMIF during the deadlift between 25% LLH and 75% LLH (p < 0.001). There was observed an increase in impulse between pre- and post-test only at 75% LLH (p < 0.001), decrease in time to peak force between pre- and post-test only at 75% LLH (p < 0.001), and increase in peak force between pre- and post-test at 75% LLH (p = 0.029). The present results showed that the maximal isometric deadlift exercise at 75% LLH (midthigh) improves subsequent jump performance of the squat jump recreationally-trained men.

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