Influence of variable resistance loading on subsequent free weight maximal back squat performance.

Hdl Handle:
http://hdl.handle.net/10545/621963
Title:
Influence of variable resistance loading on subsequent free weight maximal back squat performance.
Authors:
Mina, Minas A. ( 0000-0001-9537-5953 ) ; Blazevich, Anthony J.; Giakas, Giannis; Kay, Anthony D.
Abstract:
The purpose of the study was to determine the potentiating effects of variable resistance (VR) exercise during a warm-up on subsequent free-weight resistance (FWR) maximal squat performance. In the first session, 16 recreationally active men (age = 26.0 ± 7.8 years; height = 1.7 ± 0.2 m; mass = 82.6 ± 12.7 kg) were familiarized with the experimental protocols and tested for 1 repetition maximum (1RM) squat lift. The subjects then visited the laboratory on 2 further occasions under either control or experimental conditions. During these conditions, 2 sets of 3 repetitions of either FWR (control) or VR (experimental) squat lifts at 85% of 1RM were performed; during the experimental condition, 35% of the load was generated from band tension. After a 5-minute rest, 1RM, 3D knee joint kinematics, and vastus medialis, vastus lateralis, rectus femoris, and semitendinosus electromyogram (EMG) signals were recorded simultaneously. No subject increased 1RM after FWR, however, 13 of 16 (81%) subjects increased 1RM after VR (mean = 7.7%; p < 0.01). Lower peak and mean eccentric (16-19%; p ≤ 0.05) and concentric (12-21%; p ≤ 0.05) knee angular velocities were observed during the 1RM following VR when compared with FWR, however, no differences in knee flexion angle (1.8°; p > 0.05) or EMG amplitudes (mean = 5.9%; p > 0.05) occurred. Preconditioning using VR significantly increased 1RM without detectable changes in knee extensor muscle activity or knee flexion angle, although eccentric and concentric velocities were reduced. Thus, VR seems to potentiate the neuromuscular system to enhance subsequent maximal lifting performance. Athletes could thus use VR during warm-up routines to maximize squat performance.
Affiliation:
University of Derby; Edith Cowan University; University of Thessaly; University of Northampton
Citation:
Mina, M. A. et al (2014) 'Influence of Variable Resistance Loading on Subsequent Free Weight Maximal Back Squat Performance', Journal of Strength and Conditioning Research, 28 (10):2988.
Publisher:
National Strength and Conditioning Association
Journal:
Journal of Strength and Conditioning Research
Issue Date:
Oct-2014
URI:
http://hdl.handle.net/10545/621963
DOI:
10.1519/JSC.0000000000000471
Additional Links:
http://content.wkhealth.com/linkback/openurl?sid=WKPTLP:landingpage&an=00124278-201410000-00037
Type:
Article
Language:
en
ISSN:
10648011
Sponsors:
N/A
Appears in Collections:
School of Human Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorMina, Minas A.en
dc.contributor.authorBlazevich, Anthony J.en
dc.contributor.authorGiakas, Giannisen
dc.contributor.authorKay, Anthony D.en
dc.date.accessioned2017-11-24T12:07:00Z-
dc.date.available2017-11-24T12:07:00Z-
dc.date.issued2014-10-
dc.identifier.citationMina, M. A. et al (2014) 'Influence of Variable Resistance Loading on Subsequent Free Weight Maximal Back Squat Performance', Journal of Strength and Conditioning Research, 28 (10):2988.en
dc.identifier.issn10648011-
dc.identifier.doi10.1519/JSC.0000000000000471-
dc.identifier.urihttp://hdl.handle.net/10545/621963-
dc.description.abstractThe purpose of the study was to determine the potentiating effects of variable resistance (VR) exercise during a warm-up on subsequent free-weight resistance (FWR) maximal squat performance. In the first session, 16 recreationally active men (age = 26.0 ± 7.8 years; height = 1.7 ± 0.2 m; mass = 82.6 ± 12.7 kg) were familiarized with the experimental protocols and tested for 1 repetition maximum (1RM) squat lift. The subjects then visited the laboratory on 2 further occasions under either control or experimental conditions. During these conditions, 2 sets of 3 repetitions of either FWR (control) or VR (experimental) squat lifts at 85% of 1RM were performed; during the experimental condition, 35% of the load was generated from band tension. After a 5-minute rest, 1RM, 3D knee joint kinematics, and vastus medialis, vastus lateralis, rectus femoris, and semitendinosus electromyogram (EMG) signals were recorded simultaneously. No subject increased 1RM after FWR, however, 13 of 16 (81%) subjects increased 1RM after VR (mean = 7.7%; p < 0.01). Lower peak and mean eccentric (16-19%; p ≤ 0.05) and concentric (12-21%; p ≤ 0.05) knee angular velocities were observed during the 1RM following VR when compared with FWR, however, no differences in knee flexion angle (1.8°; p > 0.05) or EMG amplitudes (mean = 5.9%; p > 0.05) occurred. Preconditioning using VR significantly increased 1RM without detectable changes in knee extensor muscle activity or knee flexion angle, although eccentric and concentric velocities were reduced. Thus, VR seems to potentiate the neuromuscular system to enhance subsequent maximal lifting performance. Athletes could thus use VR during warm-up routines to maximize squat performance.en
dc.description.sponsorshipN/Aen
dc.language.isoenen
dc.publisherNational Strength and Conditioning Associationen
dc.relation.urlhttp://content.wkhealth.com/linkback/openurl?sid=WKPTLP:landingpage&an=00124278-201410000-00037en
dc.rightsArchived with thanks to Journal of Strength and Conditioning Researchen
dc.subjectElastic bandsen
dc.subjectPostactivation potentiationen
dc.subjectPreconditioningen
dc.subjectStrength trainingen
dc.subjectSport scienceen
dc.titleInfluence of variable resistance loading on subsequent free weight maximal back squat performance.en
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.contributor.departmentEdith Cowan Universityen
dc.contributor.departmentUniversity of Thessalyen
dc.contributor.departmentUniversity of Northamptonen
dc.identifier.journalJournal of Strength and Conditioning Researchen
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