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Titolo:
Isometric and concentric performance of electrically stimulated ankle plantar flexor muscles in intact rat
Autore:
Willems, MET; Sauber, WT;
Indirizzi:
W Virginia Univ, Dept Physiol, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 Physiol, Morgantown, WV 26506 USA W Virginia Univ, Dept Neurol, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 Neurol, Morgantown, WV 26506 USA
Titolo Testata:
EXPERIMENTAL PHYSIOLOGY
fascicolo: 2, volume: 84, anno: 1999,
pagine: 379 - 389
SICI:
0958-0670(199903)84:2<379:IACPOE>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
FORCE-LENGTH PROPERTIES; IN-VIVO; GASTROCNEMIUS-MUSCLE; STRENGTH MEASUREMENTS; SOLEUS; CONTRACTIONS; DEPRESSION; VELOCITY; FLEXION; FIBERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Sauber, WT W Virginia Univ, Dept Physiol, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 rgantown, WV 26506 USA
Citazione:
M.E.T. Willems e W.T. Sauber, "Isometric and concentric performance of electrically stimulated ankle plantar flexor muscles in intact rat", EXP PHYSIOL, 84(2), 1999, pp. 379-389

Abstract

The relationship between muscle force and ankle position during isometric and pre-loaded slow concentric contractions (angular velocity, 0.52 rad s(-1); range of motion, 1.22 rad) and the recovery of isometric force following concentric contractions at different velocities were determined for electrically stimulated plantar flexor muscles in intact rats. Pre-loaded refersto the isometric contraction which immediately precedes the concentric contraction. Ankle position was controlled by a dynamometer and force was recorded under the sole of the foot. The peak isometric force (19.2 N) was nearly constant at all ankle positions (range of motion, 1.57 rad). The muscle length and distal fibre length of gastrocnemius medialis at ankle positionsbetween 0.79 rad and 2.01 rad were increased by 12.6 % and 20.3 %, respectively. During slow concentric contractions, the force progressively decreased (23.1 +/- 2.1 %); the force decreased by only 6.3 +/- 0.9 % during sustained isometric contractions of similar duration (3400 ms). The recovery of isometric force following concentric contractions with similar stimulation frequencies (80 Hz) was velocity dependent (i.e, more rapid at higher velocities). it is concluded that pre-loaded slow concentric contractions of theplantar flexor muscles in intact rats do not follow the same relationship as that of isometric force and ankle position. Our results in intact rats show that the force output of electrically stimulated ankle plantar flexor muscles measured under the sole of the foot can be used to study the physiological properties of skeletal muscle working in situ.

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Documento generato il 03/04/20 alle ore 20:37:20