A1 Journal article (refereed)
Increased fascicle length but not patellar tendon stiffness after accentuated eccentric-load strength training in already-trained men (2020)


Walker, S., Trezise, J., Haff, G. G., Newton, R. U., Häkkinen, K., & Blazevich, A. J. (2020). Increased fascicle length but not patellar tendon stiffness after accentuated eccentric-load strength training in already-trained men. European Journal of Applied Physiology, 120(11), 2371-2382. https://doi.org/10.1007/s00421-020-04462-x


JYU authors or editors


Publication details

All authors or editors: Walker, Simon; Trezise, Joanne; Haff, Guy Gregory; Newton, Robert U.; Häkkinen, Keijo; Blazevich, Anthony J.

Journal or series: European Journal of Applied Physiology

ISSN: 1439-6319

eISSN: 1439-6327

Publication year: 2020

Volume: 120

Issue number: 11

Pages range: 2371-2382

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/s00421-020-04462-x

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71426


Abstract

Purpose
This study examined whether additional external load during the eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–eccentric training in already-trained men.

Methods
Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated eccentric loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external load in both concentric and eccentric phases, while AEL used 40% greater load during the eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s−1) concentric, eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound.

Results
After training, both TRAD and AEL significantly increased maximum concentric and isometric torque (p < 0.05), but only AEL increased eccentric torque (AEL: + 10 ± 9%, TRAD: + 4 ± 9%) and vastus lateralis (AEL: + 14 ± 14%, TRAD: + 1 ± 10%) and medialis (AEL: + 19 ± 8%, TRAD: + 5 ± 11%) fascicle length.

Conclusion
Both TRAD and AEL increased maximum knee extensor strength but only AEL increased VL and VM fascicle length. Neither training program promoted changes in fascicle angle or changes in patellar tendon properties in our already-trained men.


Keywords: physical strain; training; strength training; muscles; mechanics

Free keywords: eccentric overload; resistance training; muscle architecture; adaptation; mechanical properties


Contributing organizations


Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1


Last updated on 2021-20-09 at 16:25