The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps
This study examined effects of accentuated eccentric loading (AEL) on barbell and trap bar loaded countermovement jumps (LCMJ). Twenty-one subjects (16 male, 5 female; Age: 23.5 ± 1.8 years; Body mass: 81.4 ± 10.6 kg; Height: 176.9 ± 7.2 cm; Training age: 7.1 ± 2.6 years) participated in this study...
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| Format: | Article |
| Language: | English |
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International Universities Strength and Conditioning Association
2023-09-01
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| Series: | International Journal of Strength and Conditioning |
| Subjects: | |
| Online Access: | https://journal.iusca.org/index.php/Journal/article/view/213 |
| _version_ | 1797676816042819584 |
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| author | Christopher Taber Calin Butler Victoria Dabek Benjamin Kochan Kyle McCormick Emily Petro Timothy Suchomel Justin Merrigan |
| author_facet | Christopher Taber Calin Butler Victoria Dabek Benjamin Kochan Kyle McCormick Emily Petro Timothy Suchomel Justin Merrigan |
| author_sort | Christopher Taber |
| collection | DOAJ |
| description |
This study examined effects of accentuated eccentric loading (AEL) on barbell and trap bar loaded countermovement jumps (LCMJ). Twenty-one subjects (16 male, 5 female; Age: 23.5 ± 1.8 years; Body mass: 81.4 ± 10.6 kg; Height: 176.9 ± 7.2 cm; Training age: 7.1 ± 2.6 years) participated in this study. Upon establishing one repetition maximum and baseline jumping conditions, three experimental loading sessions were completed in random order. Barbell and trap bar LCMJ were performed with a spectrum of fixed loads from 20-50 kg during control conditions and with additional AEL loads of 10, 20, or 30 kg for experimental conditions. According to coefficients of variation (<10%), jump height, modified reactive strength index (mRSI), force, impulse, and duration measures were considered reliable across conditions. Mixed effect models analyzed effects of AEL against fixed loading in trap bar and barbell LCMJ (p < 0.05). Compared to the control condition, AEL produced negligible reductions in jump height during barbell LCMJ and small reductions during trap bar LCMJ. Modified reactive strength indexes were reduced by AEL during barbell LCMJ but not trap bar LCMJ. Average braking forces were greater in AEL conditions, while propulsive impulse was lower in the AEL conditions. The barbell LCMJ with AEL resulted in longer propulsive durations and unchanged braking durations, while propulsive and braking durations were lower during trap bar LCMJ with AEL compared to control conditions. This investigation revealed that use of AEL increases eccentric braking forces but decreases propulsive phase outputs, which subsequently may result in negligible to small acute decreases in LCMJ height. Implementing AEL during LCMJ may be an effective strategy to improve deceleration / eccentric abilities. Future research should explore longitudinal power and deceleration adaptations, while concomitantly improving acutely altered movement mechanics from AEL.
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| first_indexed | 2024-03-11T22:35:49Z |
| format | Article |
| id | doaj.art-56f74dff158549278bb241c9a9af12fa |
| institution | Directory Open Access Journal |
| issn | 2634-2235 |
| language | English |
| last_indexed | 2024-03-11T22:35:49Z |
| publishDate | 2023-09-01 |
| publisher | International Universities Strength and Conditioning Association |
| record_format | Article |
| series | International Journal of Strength and Conditioning |
| spelling | doaj.art-56f74dff158549278bb241c9a9af12fa2023-09-22T14:16:59ZengInternational Universities Strength and Conditioning AssociationInternational Journal of Strength and Conditioning2634-22352023-09-013110.47206/ijsc.v3i1.213The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement JumpsChristopher Taber0Calin Butler1Victoria Dabek2Benjamin Kochan3Kyle McCormick4Emily Petro5Timothy Suchomel 6Justin Merrigan7Sacred Heart UniversitySacred Heart University Sacred Heart University Sacred Heart University Sacred Heart University Sacred Heart University Carroll University The Ohio State University This study examined effects of accentuated eccentric loading (AEL) on barbell and trap bar loaded countermovement jumps (LCMJ). Twenty-one subjects (16 male, 5 female; Age: 23.5 ± 1.8 years; Body mass: 81.4 ± 10.6 kg; Height: 176.9 ± 7.2 cm; Training age: 7.1 ± 2.6 years) participated in this study. Upon establishing one repetition maximum and baseline jumping conditions, three experimental loading sessions were completed in random order. Barbell and trap bar LCMJ were performed with a spectrum of fixed loads from 20-50 kg during control conditions and with additional AEL loads of 10, 20, or 30 kg for experimental conditions. According to coefficients of variation (<10%), jump height, modified reactive strength index (mRSI), force, impulse, and duration measures were considered reliable across conditions. Mixed effect models analyzed effects of AEL against fixed loading in trap bar and barbell LCMJ (p < 0.05). Compared to the control condition, AEL produced negligible reductions in jump height during barbell LCMJ and small reductions during trap bar LCMJ. Modified reactive strength indexes were reduced by AEL during barbell LCMJ but not trap bar LCMJ. Average braking forces were greater in AEL conditions, while propulsive impulse was lower in the AEL conditions. The barbell LCMJ with AEL resulted in longer propulsive durations and unchanged braking durations, while propulsive and braking durations were lower during trap bar LCMJ with AEL compared to control conditions. This investigation revealed that use of AEL increases eccentric braking forces but decreases propulsive phase outputs, which subsequently may result in negligible to small acute decreases in LCMJ height. Implementing AEL during LCMJ may be an effective strategy to improve deceleration / eccentric abilities. Future research should explore longitudinal power and deceleration adaptations, while concomitantly improving acutely altered movement mechanics from AEL. https://journal.iusca.org/index.php/Journal/article/view/213Weight releasersStrength trainingPyometrics |
| spellingShingle | Christopher Taber Calin Butler Victoria Dabek Benjamin Kochan Kyle McCormick Emily Petro Timothy Suchomel Justin Merrigan The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps International Journal of Strength and Conditioning Weight releasers Strength training Pyometrics |
| title | The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps |
| title_full | The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps |
| title_fullStr | The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps |
| title_full_unstemmed | The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps |
| title_short | The Effects of Accentuated Eccentric Loading on Barbell and Trap Bar Countermovement Jumps |
| title_sort | effects of accentuated eccentric loading on barbell and trap bar countermovement jumps |
| topic | Weight releasers Strength training Pyometrics |
| url | https://journal.iusca.org/index.php/Journal/article/view/213 |
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