1 / 21

STRETCH-SHORTENING CYCLE

STRETCH-SHORTENING CYCLE. IC. EC. CC. SSC. F ex. IC. EC. C C. F ex. Thereshold. Thereshold. 0.6 M 0. 0.6 M 0. IC. EC. IC. ELASTIC ENERGY STORAGE. CC. IC. EC. MECHANICAL WORK EFFICIENCY. Normal. Fast. 100%. 100%. 40%. 40%. THEORY. No pretension before shortening.

shiri
Download Presentation

STRETCH-SHORTENING CYCLE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. STRETCH-SHORTENING CYCLE

  2. IC EC CC SSC Fex

  3. IC EC CC Fex

  4. Thereshold Thereshold 0.6 M0 0.6 M0 IC EC IC ELASTIC ENERGY STORAGE CC IC EC

  5. MECHANICAL WORK EFFICIENCY Normal Fast 100% 100% 40% 40%

  6. THEORY No pretension before shortening Pretension before shortening Muscle stretch before shortening

  7. 1.0Mo 0.5Mo Benefit of muscle stretch Contraction time

  8. Mechanical work Muscle tension 1.0M0 at which the knee extension or muscle stretch started Muscle tension 0.5M0 at which the knee extension or muscle stretch started

  9. ENERGIA TRANSZFORMÁCIÓ 61.9 J Tihanyi J. Principles of power training and control of dynamic muscle work

  10. IC EC ? 60.8 J ? QT PT 61.9 J

  11. Negatív és pozitív munka Mechanical efficiency shortening Pozitive work Negative work lengthening

  12. MECHANIKAI HATÁSFOK

  13. Cavagna et al. 1968, Cavagna and Citterio 1974, Alexander and Bennet-Clark 1977, Edman et al. 1978, Asmussen and Bonde-Pettersen 1974, Komi and Bosco 1978 ? Van Ingen Schenau, Bobbert and de Haan 1993

  14. mtc- izom-ín complexum Wpos, i = pozitív munka a CMJ-nél vagy DJ-nál Wpos, SQJ = pozitív munka a guggolásból felugrás Wneg,i = Negatív munka az ízületi hajlítás során CMJ-nél, vagy DJ-nél

  15. Long and slow stretch Slow muscle Short and fast stretch Fast muscle

  16. Small amplitude (short stretch) Large amplitude (long stretch) R = 0.53, p < 0.05 R = 0.66, p < 0.01

  17. EFFECT OF EXHAUTION Before exhaution After exhaustion R = 0.50, p < 0.05 R = 0.55, p < 0.05

More Related