A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat


Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajatWalker, Simon; Trezise, Joanne; Haff, Guy Gregory; Newton, Robert U.; Häkkinen, Keijo; Blazevich, Anthony J.

Lehti tai sarjaEuropean Journal of Applied Physiology

ISSN1439-6319

eISSN1439-6327

Julkaisuvuosi2020

Ilmestymispäivä09.08.2020

Volyymi120

Lehden numero11

Artikkelin sivunumerot2371-2382

KustantajaSpringer

JulkaisumaaSaksa

Julkaisun kielienglanti

DOIhttps://doi.org/10.1007/s00421-020-04462-x

Julkaisun avoin saatavuusAvoimesti saatavilla

Julkaisukanavan avoin saatavuusOsittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX)https://jyx.jyu.fi/handle/123456789/71426


Tiivistelmä

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.


YSO-asiasanatfyysinen kuormittavuusharjoitteluvoimaharjoittelulihaksetmekaniikka

Vapaat asiasanateccentric overload; resistance training; muscle architecture; adaptation; mechanical properties


Liittyvät organisaatiot


OKM-raportointiKyllä

Raportointivuosi2020

JUFO-taso1


Viimeisin päivitys 2024-26-03 klo 09:19