Comparison of the effects of deadlift versus back squat on jumping, acceleration, and change of direction¹

Article type: Research Article

Authors: Shiba, Junpei^{a; *} | Kuramochi, Rieko^{b; c} | Tokutake, Gaku^d | Enoki, Shota^c | Nakamura, Yuta^e | Kotoh, Yuki^e

Affiliations: [a] Department of Human Health, Faculty of Human Health, Aichi Toho University, Aichi, Japan | [b] Graduate School of Health and Sport Sciences, Chukyo University, Aichi, Japan | [c] School of Health and Sport Sciences, Chukyo University, Aichi, Japan | [d] Institute for General Education, Ritsumeikan University, Osaka, Japan | [e] Yoshida Orthopaedic Hospital, Aichi, Japan

Correspondence: [*] Corresponding author: Junpei Shiba, Department of Human Health, Faculty of Human Health, Aichi Toho University, 3-11 Heiwagaoka Meito-Ku, Nagoya, Aichi 465-8515, Japan. Tel.: +81 527821241; Fax: +81 527821943; E-mail: [email protected].

Note: [1] Note: This article received a correction notice (Erratum) post publication with DOI 10.3233/IES-239001, available at http://doi.org/ 10.3233/IES-239001.

Abstract: BACKGROUND: An advantage that deadlift (DL) has over back squat (BSQ) is that the latter requires additional equipment (i.e., squat rack). Accordingly, if DL can lead to positive effects on jumping, acceleration, and change of direction, DL could present as a more practical training exercise than that of BSQ. OBJECTIVE: This study aimed to compare the effects of DL and BSQ on jumping, acceleration, and change of direction. METHODS: Twenty-three men (12 in the DL group [age: 20.3 ± 1.4 years old, height: 169.6 ± 6.7 cm, body weight: 65.7 ± 11.2 kg] and 11 in the BSQ group [age: 20.2 ± 1.9 years old, height: 171.5 ± 4.8 cm, body weight: 70.1 ± 6.8 kg]) participated in this study. The participants performed five repetitions maximum (RM) of DL and BSQ, and the isokinetic strength of hip joint extension, muscle thickness of the gluteus maximus and hamstrings, countermovement jump (CMJ) height, 10 m sprint time, and T-test results were measured. The 1RM was estimated using the 5RM and normalized to body weight (BW). Both groups performed supervised DL and BSQ training for eight sessions. RESULTS: There were significant improvements on 1RM DL/BW (p< 0.01), 1RM BSQ/BW (p< 0.01), and 10 m sprint (p< 0.01) in the two groups. The effect sizes (d) of the DL and BSQ groups were 2.01 and 1.04 for 1RM DL/BW, 1.08 and 2.08 for 1RM BSQ/BW, 0.35 and 0.11 for CMJ height, and -0.94 and -0.54 for 10 m sprint, respectively. CONCLUSIONS: DL training might improve jumping and acceleration compared to those of BSQ training.

Keywords: Strength training, maximum strength, deadlift, back squat

DOI: 10.3233/IES-220068

Journal: Isokinetics and Exercise Science, vol. 31, no. 2, pp. 87-95, 2023