Concentric force enhancement during human movement
Finni Juutinen, T., Ikegawa, S., & Komi, P. (2001). Concentric force enhancement during human movement. Acta Physiologica Scandinavica, 2001(173), 369-377.
Julkaistu sarjassa
Acta Physiologica ScandinavicaPäivämäärä
2001Tekijänoikeudet
© Wiley. This is a final draft version of an article whose final and definitive form has been published by Wiley.
In order to understand the possible mechanisms contributing to enhanced concentric performance in stretch-shortening cycle exercises in vivo the present study examined knee extension torque, EMG activity and fascicle length of the vastus lateralis muscle in maximal and submaximal human movements. Maximal concentric knee extensions (120 s-1) were done after pre-stretch and pre-isometric conditions by nine volunteers. During shortening at the knee angle of 115 (180 = extended) the knee extension torque was found to be greater in pre-stretch condition (272 vs. 248 Nm, p < 0.05) although the torque level prior to shortening was smaller than in pre-isometric condition (268 vs. 314 Nm, p< 0.05). At the moment of torque enhancement the EMG activity levels or fascicle lengths did not differ between the conditions. It is proposed that besides specific experimental conditions the present enhancement may be related to longer fascicle length prior to shortening (by 4.1 cm, p< 0.05) in pre-stretch condition and to modified length-tension properties. Fascicle length behaviour was found to play an important role also in unilateral, submaximal sledge-jump conditions where pre-loading was altered but the concentric net impulse and joint angular movements were the same. In repeated drop jumps with greater pre-load the changes in fascicle length were smaller than in the counter movement jump that was characterized by a lower force and activity level in the eccentric phase. Results from the present maximal and submaximal loading conditions suggest that the benefits of stretch-shortening cycle muscle function may come through different interactive mechanisms that may be task specific.
...
Julkaisija
WileyISSN Hae Julkaisufoorumista
0001-6772Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/24830654
Metadata
Näytä kaikki kuvailutiedotKokoelmat
- Liikuntatieteiden tiedekunta [2895]
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
The effects of cold water immersion on medial gastrocnemius muscle architecture and performance post-exhaustive stretch-shortening cycle exercise
Kositsky, Adam (2017)Cold water immersion (CWI) is a method highly used in the recovery from fatiguing exercise yet its efficacy is debated. It has been proposed that the resultant suppressed inflammation decreases pain and muscle soreness and ... -
Muscle and joint stiffness regulation during normal and fatiguing stretch-shortening cycle exercise
Kuitunen, Sami (University of Jyväskylä, 2010) -
Gene expressions of SREBP-2, PPARδ, MYH7 and blood lipid changes induced by stretch-shortening cycle exercise
Khalilpour, Armaghan (2011)The present study was to investigate whether the mRNA levels of the transcription factors, sterol regulatory element-binding protein-2 (SREBP-2), peroxisome proliferator-activated receptor-δ (PPARδ) as well as slow type ... -
Medial Gastrocnemius Muscle Architecture Is Altered After Exhaustive Stretch-Shortening Cycle Exercise
Kositsky, Adam; Kidgell, Dawson J.; Avela, Janne (Frontiers Media, 2019)Muscle architecture is an important component of muscle function, and recent studies have shown changes in muscle architecture with fatigue. The stretch-shortening cycle is a natural way to study human locomotion, but ... -
Muscle-Tendon Interaction During Human Dolphin-Kick Swimming
Sano, Kanae; Sakamoto, Takumi; Nishimura, Ryoma; Danno, Yoshito; Komi, Paavo V.; Ishikawa, Masaki (Frontiers Media, 2019)Without high impact forces, it is not clear how humans can utilize tendon elasticity during low-impact activities. The purpose of the present study was to examine the muscle-tendon behavior together with the electromyographic ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.