Actions of lyotropic anions on the mechanical properties of fast and slow twitch rat muscles at different temperatures

Title:

Actions of lyotropic anions on the mechanical properties of fast and slow twitch rat muscles at different temperatures

Creator:

Wondmikun, Y., Tomáš Soukup, and Gerhard Asmussen

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:001818d7-5194-46fb-aca8-cd9cd801957c
uuid:001818d7-5194-46fb-aca8-cd9cd801957c
issn:0862-8408

Subject:

Fyziologie člověka a srovnávací fyziologie, svaly, teplota, muscles, temperature, slow and fast muscles, contractile properties, twitch potentiation, lyotropic anions, rat, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

The effects of lyotropic (swelling) anions (Cl-, Br-, NO3- and I-) on contractile properties of fast-twitch extensor digitorum longus (EDL) and slow-twitch soleus (SOL) muscles were investigated in vitro at 20 °C and 35 °C. Isolated muscles bathed in anionic Tyrode solution were stimulated directly and isometric single twitches and fused tetanic contractions were recorded. In a Cl- Tyrode solution a decrease of the bathing temperature led to a cold potentiation of the twitch tension (Pt) in EDL muscles, however, to a cold depression in SOL muscles, in both muscles combined with a prolongation of contraction (CT) and half relaxation (HRT) times. The extent and order of the potentiating effect of lyotropic anions on the Pt, CT and HRT in EDL and SOL were quite similar and increased in the order: Cl-< Br- < NO3- < I-. Since the lyotropic anions did not influence tetanic tensions, the twitch-tetanus ratio (TTR) was increased in NO3- and I- solutions. All effects of the anions were rapidly and completely reversed in both muscles when the test solution was replaced by the normal one. The temperature decrease caused no significant alteration in the potentiation capacity of the anions or in the kinetics of their action and reversibility., Y. Wondmikun, T. Soukup, G. Asmussen., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2003 Volume:52 | Number:1

Harvested from:

CDK

Metadata only:

false