Faculty Collaboration Database

Mechanical Demands of the Hang Power Clean and Jump Shrug: A Joint-Level Perspective. J Strength Cond Res 2018 Feb;32(2):466-474

Date

09/27/2016

Pubmed ID

27669182

DOI

10.1519/JSC.0000000000001636

Scopus ID

2-s2.0-85049280657 (requires institutional sign-in at Scopus site)   25 Citations

Abstract

Kipp, K, Malloy, PJ, Smith, J, Giordanelli, MD, Kiely, MT, Geiser, CF, and Suchomel, TJ. Mechanical demands of the hang power clean and jump shrug: a joint-level perspective. J Strength Cond Res 32(2): 466-474, 2018-The purpose of this study was to investigate the joint- and load-dependent changes in the mechanical demands of the lower extremity joints during the hang power clean (HPC) and the jump shrug (JS). Fifteen male lacrosse players were recruited from a National Collegiate Athletic Association DI team, and completed 3 sets of the HPC and JS at 30, 50, and 70% of their HPC 1 repetition maximum (1RM HPC) in a counterbalanced and randomized order. Motion analysis and force plate technology were used to calculate the positive work, propulsive phase duration, and peak concentric power at the hip, knee, and ankle joints. Separate 3-way analysis of variances were used to determine the interaction and main effects of joint, load, and lift type on the 3 dependent variables. The results indicated that the mechanics during the HPC and JS exhibit joint-, load-, and lift-dependent behavior. When averaged across joints, the positive work during both lifts increased progressively with external load, but was greater during the JS at 30 and 50% of 1RM HPC than during the HPC. The JS was also characterized by greater hip and knee work when averaged across loads. The joint-averaged propulsive phase duration was lower at 30% than at 50 and 70% of 1RM HPC for both lifts. Furthermore, the load-averaged propulsive phase duration was greater for the hip than the knee and ankle joint. The joint-averaged peak concentric power was the greatest at 70% of 1RM for the HPC and at 30%-50% of 1RM for the JS. In addition, the joint-averaged peak concentric power of the JS was greater than that of the HPC. Furthermore, the load-averaged peak knee and ankle concentric joint powers were greater during the execution of the JS than the HPC. However, the load-averaged power of all joints differed only during the HPC, but was similar between the hip and knee joints for the JS. Collectively, these results indicate that compared with the HPC the JS is characterized by greater hip and knee positive joint work, and greater knee and ankle peak concentric joint power, especially if performed at 30 and 50% of 1RM HPC. This study provides important novel information about the mechanical demands of 2 commonly used exercises and should be considered in the design of resistance training programs that aim to improve the explosiveness of the lower extremity joints.

Author List

Kipp K, Malloy PJ, Smith JC, Giordanelli MD, Kiely MT, Geiser CF, Suchomel TJ

Authors

Christopher Geiser BS,MS Assistant Professor/Athletic Training Director in the Exercise Science department at Marquette University
Kristof Kipp BS,MS,PhD Assistant Professor in the Physical Therapy department at Marquette University
Phillip Malloy in the CTSI department at Medical College of Wisconsin - CTSI

MESH terms used to index this publication - Major topics in bold

Ankle Joint
Athletes
Biomechanical Phenomena
Hip Joint
Humans
Knee Joint
Lower Extremity
Male
Motion
Muscle Strength
Racquet Sports
Resistance Training
Young Adult