Muscle activation varies between high-bar and low-bar back squat
Background Differences in the muscular activity between the high-bar back squat (HBBS) and the low-bar back squat (LBBS) on the same representative group of experienced powerlifters are still scarcely investigated. The main purpose of the study was to compare the normalized bioelectrical activity an...
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PeerJ Inc.
2020-06-01
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| Online Access: | https://peerj.com/articles/9256.pdf |
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| author | Michal Murawa Anna Fryzowicz Jaroslaw Kabacinski Jakub Jurga Joanna Gorwa Manuela Galli Matteo Zago |
| author_facet | Michal Murawa Anna Fryzowicz Jaroslaw Kabacinski Jakub Jurga Joanna Gorwa Manuela Galli Matteo Zago |
| author_sort | Michal Murawa |
| collection | DOAJ |
| description | Background Differences in the muscular activity between the high-bar back squat (HBBS) and the low-bar back squat (LBBS) on the same representative group of experienced powerlifters are still scarcely investigated. The main purpose of the study was to compare the normalized bioelectrical activity and maximal angles within single homogeneous group between the HBBS and LBBS for 60% one repetition maximum (1RM), 65% 1RM and 70% 1RM. Methods Twelve healthy men (age 24.3 ± 2.8 years, height 178.8 ± 5.6 cm, body mass 88.3 ± 11.5 kg), experienced in powerlifting performed HBBS and LBBS with comparable external loads equal 60% 1RM, 65% 1RM, and 70% 1RM. Electromyography (EMG) signals of muscle groups were synchronously recorded alongside kinematic data (joints angle) by means of a motion capture system. Results EMG activity during eccentric phase of squat motion were significantly higher during LBBS than in HBBS for all selected muscles (60% 1RM and 65% 1RM) (p < 0.05). All examined muscles were more activated during concentric phase of the squat cycle (p < 0.05). In the concentric phase, significant differences between the loads were generally not observed between just 5% 1RM change in load level for LBBS. Conclusions Our results confirmed significant differences in muscles activation between both squat techniques. Muscle activity during eccentric phase of squat motion were significantly higher during LBBS than HBBS. The differences are crucial for posterior muscle chain during eccentric phase of squat cycle. |
| first_indexed | 2024-03-09T06:41:01Z |
| format | Article |
| id | doaj.art-2c97901c79c44e89a25d668f265dcb8c |
| institution | Directory Open Access Journal |
| issn | 2167-8359 |
| language | English |
| last_indexed | 2024-03-09T06:41:01Z |
| publishDate | 2020-06-01 |
| publisher | PeerJ Inc. |
| record_format | Article |
| series | PeerJ |
| spelling | doaj.art-2c97901c79c44e89a25d668f265dcb8c2023-12-03T10:50:49ZengPeerJ Inc.PeerJ2167-83592020-06-018e925610.7717/peerj.9256Muscle activation varies between high-bar and low-bar back squatMichal Murawa0Anna Fryzowicz1Jaroslaw Kabacinski2Jakub Jurga3Joanna Gorwa4Manuela Galli5Matteo Zago6Department of Biomechanics, Poznan University of Physical Education, Poznan, PolandDepartment of Biomechanics, Poznan University of Physical Education, Poznan, PolandDepartment of Biomechanics, Poznan University of Physical Education, Poznan, PolandDepartment of Biomechanics, Poznan University of Physical Education, Poznan, PolandDepartment of Biomechanics, Poznan University of Physical Education, Poznan, PolandDipartimento di Elettronica, Informazione e Bioignegneria, Politecnico di Milano, Milano, ItalyDipartimento di Elettronica, Informazione e Bioignegneria, Politecnico di Milano, Milano, ItalyBackground Differences in the muscular activity between the high-bar back squat (HBBS) and the low-bar back squat (LBBS) on the same representative group of experienced powerlifters are still scarcely investigated. The main purpose of the study was to compare the normalized bioelectrical activity and maximal angles within single homogeneous group between the HBBS and LBBS for 60% one repetition maximum (1RM), 65% 1RM and 70% 1RM. Methods Twelve healthy men (age 24.3 ± 2.8 years, height 178.8 ± 5.6 cm, body mass 88.3 ± 11.5 kg), experienced in powerlifting performed HBBS and LBBS with comparable external loads equal 60% 1RM, 65% 1RM, and 70% 1RM. Electromyography (EMG) signals of muscle groups were synchronously recorded alongside kinematic data (joints angle) by means of a motion capture system. Results EMG activity during eccentric phase of squat motion were significantly higher during LBBS than in HBBS for all selected muscles (60% 1RM and 65% 1RM) (p < 0.05). All examined muscles were more activated during concentric phase of the squat cycle (p < 0.05). In the concentric phase, significant differences between the loads were generally not observed between just 5% 1RM change in load level for LBBS. Conclusions Our results confirmed significant differences in muscles activation between both squat techniques. Muscle activity during eccentric phase of squat motion were significantly higher during LBBS than HBBS. The differences are crucial for posterior muscle chain during eccentric phase of squat cycle.https://peerj.com/articles/9256.pdfPowerliftingElectromyographyResistance trainingRepetition maximum |
| spellingShingle | Michal Murawa Anna Fryzowicz Jaroslaw Kabacinski Jakub Jurga Joanna Gorwa Manuela Galli Matteo Zago Muscle activation varies between high-bar and low-bar back squat PeerJ Powerlifting Electromyography Resistance training Repetition maximum |
| title | Muscle activation varies between high-bar and low-bar back squat |
| title_full | Muscle activation varies between high-bar and low-bar back squat |
| title_fullStr | Muscle activation varies between high-bar and low-bar back squat |
| title_full_unstemmed | Muscle activation varies between high-bar and low-bar back squat |
| title_short | Muscle activation varies between high-bar and low-bar back squat |
| title_sort | muscle activation varies between high bar and low bar back squat |
| topic | Powerlifting Electromyography Resistance training Repetition maximum |
| url | https://peerj.com/articles/9256.pdf |
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