Relative importance of lower extremity net joint moments in relation to bar velocity and acceleration in weightlifting

Sports Biomechanics
Kristof Kipp

Abstract

The purpose of this study was to investigate the relative importance of net joint moments (NJM) in relation to bar kinematics during the clean. Ground reaction force and 3-D motion data were recorded as seven weightlifters performed cleans at 85% of their competition maximum, and were used to calculate hip, knee, and ankle NJM. Vertical bar kinematics were also calculated. NJM were used as inputs to a three-layer feedforward artificial neural network (ANN), which was trained to predict bar kinematics. Subject-specific ANN with 15 hidden neurons could effectively model the association between NJM and bar kinematics for each individual weightlifter (r: 0.965 ± 0.031; MSE: 0.169 ± 0.152). The relative importance (%) of hip, knee, and ankle NJM to bar velocity were 23%, 31%, and 46%, respectively, whereas the relative importance of hip, knee, and ankle NJM to bar acceleration were 23%, 39%, and 38%, respectively. Non-parametric statistics indicated that the ankle NJM exhibited the greatest relative importance in relation to bar velocity, whereas the knee and ankle NJM showed the greatest relative importance in relation to bar acceleration. These results indicate that the NJM produced at the knee and ankle joint are of great importa...Continue Reading

References

Oct 12, 2004·Clinical Biomechanics·W I Schöllhorn
Jun 20, 2006·Journal of Biomechanics·Michael E Hahn
Jan 18, 2011·Journal of Strength and Conditioning Research·Kristof KippMichelle B Sabick
Feb 15, 2011·Human Movement Science·Mark Pfeiffer, Andreas Hohmann
Oct 7, 2011·Journal of Applied Biomechanics·Kristof KippChad Harris
Oct 12, 2011·Journal of Strength and Conditioning Research·Kristof KippChad Harris
Jun 29, 2012·Journal of Strength and Conditioning Research·Kristof KippMichelle B Sabick
Dec 23, 2014·Journal of Sports Sciences·Kristof Kipp, Chad Harris
Sep 12, 2015·Journal of Sports Sciences·Sezgin Korkmaz, Erbil Harbili
Jul 20, 2018·Annals of Translational Medicine·Zhongheng ZhangUNKNOWN written on behalf of AME Big-Data Clinical Trial Collaborative Group
Dec 7, 2018·Journal of Statistical Software·Marcus W Beck

❮ Previous
Next ❯

Citations

Jan 23, 2021·International Journal of Environmental Research and Public Health·Dafnis Vidal PérezEva Ausó
Oct 29, 2020·Sports Biomechanics·Kristof KippJohn Warmenhoven

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.