Publication:
The Effect of Volitional Preemptive Abdominal Contraction on Biomechanical Measures During A Front Versus Back Loaded Barbell Squat

Simple item page
dc.contributor.authorMcCormick, Joseph B.
dc.contributor.authorDrusch, Alexander S.
dc.contributor.authorLynch, Darragh J.
dc.contributor.authorSeeber, Gesine H.
dc.contributor.authorWilford, Katherine F.
dc.contributor.authorHooper, Troy L.
dc.contributor.authorAllen, Brad S.
dc.contributor.authorO'Connell, Dennis G.
dc.contributor.authorMena-Iturriaga, Maria-Jesus
dc.contributor.authorKinyata J Cooper, Kinyata J.
dc.contributor.authorSizer, Phillip S.
dc.date.accessioned2024-04-01T15:28:09Z
dc.date.available2024-04-01T15:28:09Z
dc.date.issued2023
dc.description.abstractBackground: Weightlifting is growing in popularity among recreational and competitive athletes. The barbell back squat (BackS) is commonly included in these training programs, while the barbell front squat (FrontS) is commonly performed as a component of other lifts such as the power clean or clean and jerk, it is less commonly practiced in isolation. Hypothesis/purpose: The purpose of this study was to examine the effects of VPAC performance on trunk muscle and LE biomechanical responses during loaded BackS versus FrontS in healthy subjects. Study design: Controlled Laboratory Study. Methods: Healthy male subjects with the ability to perform a sub-maximal loaded barbell squat lift were recruited. Subjects completed informed consent, demographic/medical history questionnaires and an instructional video. Subjects practiced VPAC and received feedback. Surface electromyography (sEMG) electrodes and kinematic markers were applied. Muscles included were the internal oblique (IO), external oblique (EO), rectus abdominis, iliocostalis lumborum (ICL), superficial multifidi, rectus femoris, vastus lateralis, biceps femoris, and gluteus maximus. Maximal voluntary isometric contractions established reference sEMG values. A squat one-rep-max (1RM) was predicted by researchers using a three to five repetition maximum (3RM, 5RM) load protocol. Subjects performed BackS trials at 75% 1RM while FrontS trials were performed at 75% BackS weight, both with and without VPAC. Subjects performed three repetitions of each condition with feet positioned on two adjacent force plates. Significant interactions and main effects were tested using a 2(VPAC strategy) x 2(squat variation) and 2(VPAC strategy) x 2(direction) within-subject repeated measures ANOVAs. Tukey's Post-Hoc tests identified the location of significant differences. Results: Trunk muscle activity was significantly higher during FrontS versus BackS regardless of VPAC condition. (IO: p=0.018, EO: p<0.001, ICL: p<0.001) VPAC increased performance time for both squat variations (p=.0011), which may be associated with decreased detrimental force potential on the lumbar spine and knees. VPAC led to improved ability to maintain a neutral lumbar spine during both squat variations. This finding is associated with decreased detrimental force potential on the lumbar spine. Conclusions: Findings could help guide practitioners and coaches to choose squat variations and incorporate VPAC strategies during their treatments and/or training programs.
dc.description.versionVersión publicada
dc.identifier.citationMcCormick JB, Drusch AS, Lynch DJ, Seeber GH, Wilford KF, Hooper TL, Allen BS, O'Connell DG, Mena-Iturriaga MJ, Cooper KJ, Sizer PS. The Effect of Volitional Preemptive Abdominal Contraction on Biomechanical Measures During A Front Versus Back Loaded Barbell Squat. Int J Sports Phys Ther. 2023 Aug 1;18(4):831-844. doi: 10.26603/001c.84306
dc.identifier.doihttps://doi.org/10.26603/001c.84306
dc.identifier.urihttps://hdl.handle.net/11447/8570
dc.language.isoen
dc.rightsAtribución-NoComercial-CompartirIgual 3.0 Chile (CC BY-NC-SA 3.0 CL)
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/cl/
dc.subjectAbdominal bracing
dc.subjectBiomechanics
dc.subjectElectromyography
dc.subjectSpine
dc.subjectSquat
dc.titleThe Effect of Volitional Preemptive Abdominal Contraction on Biomechanical Measures During A Front Versus Back Loaded Barbell Squat
dc.typeArticle
dcterms.accessRightsAcceso abierto
dspace.entity.typePublication
relation.isAuthorOfPublication008e65f2-468c-4809-b034-e293456599da
relation.isAuthorOfPublication.latestForDiscovery008e65f2-468c-4809-b034-e293456599da

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
McCormick, 2023.pdf
Size:
480.2 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
347 B
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Artículos Medicina y Ciencias de la Salud

Implementado por OpenGeek Services