Increased fascicle length but not patellar tendon stiffness after accentuated eccentric-load strength training in already-trained men
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
Published inEuropean Journal of Applied Physiology
© 2020 the Authors
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. ...
Publication in research information system
MetadataShow full item record
- Liikuntatieteiden tiedekunta 
Additional information about fundingThis work was funded internally by the CESSR, Edith Cowan University during data collection and by the Faculty of Sport and Health Sciences, University of Jyväskylä.
Showing items with similar title or keywords.
Muscle‐tendon morphology and function following long‐term exposure to repeated and strenuous mechanical loading Bissas, Athanassios; Havenetidis, Konstantinos; Walker, Josh; Hanley, Brian; Nicholson, Gareth; Metaxas, Thomas; Christoulas, Kosmas; Cronin, Neil J. (Wiley-Blackwell, 2020)We mapped structural and functional characteristics of muscle‐tendon units in a population exposed to very long‐term routine overloading. Twenty‐eight military academy cadets (age: 21.00 ± 1.1 yrs; height: 176.1 ± 4.8 cm; ...
Hoffrén-Mikkola, Merja (University of Jyväskylä, 2014)
Greater Strength Gains after Training with Accentuated Eccentric than Traditional Isoinertial Loads in Already Strength-Trained Men Walker, Simon; Blazevich, Anthony J.; Haff, G. Gregory; Tufano, James J.; Newton, Robert U.; Häkkinen, Keijo (Frontiers Research Foundation, 2016)As training experience increases it becomes more challenging to induce further neuromuscular adaptation. Consequently, strength trainers seek alternative training methods in order to further increase strength and muscle ...
Acute elevations in serum hormones are attenuated after chronic training with traditional isoinertial but not accentuated eccentric loads in strength-trained men Walker, Simon; Häkkinen, Keijo; Haff, Guy Gregory; Blazevich, Anthony J.; Newton, Robert U. (Wiley Periodicals, Inc. on behalf of the American Physiological Society and the Physiological Society, 2017)It has been proposed that the maintenance of acute hormonal responses reveal an efficacy of a training stimulus to evoke ongoing increases in strength and muscle mass. We previously observed that maximum strength continued ...
Peltonen, Jussi (University of Jyväskylä, 2014)