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Titolo:
High-frequency initial pulses do not affect efficiency in rat fast skeletal muscle
Autore:
Abbate, F; de Ruiter, CJ; de Haan, A;
Indirizzi:
Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin HumanMovement Sci, NL-1081 BT Amsterdam, Netherlands Free Univ Amsterdam Amsterdam Netherlands NL-1081 BT terdam, Netherlands Manchester Metropolitan Univ, Neuromuscular Biol Res Grp, Alsager ST7 2HL,England Manchester Metropolitan Univ Alsager England ST7 2HL ger ST7 2HL,England
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 8, volume: 204, anno: 2001,
pagine: 1503 - 1508
SICI:
0022-0949(200104)204:8<1503:HIPDNA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GASTROCNEMIUS-MUSCLE; MOTOR UNITS; STIMULATED CONTRACTIONS; EXCITATION-FREQUENCY; MG2+ CONCENTRATION; POWER OUTPUT; FATIGUE; FORCE; POTENTIATION; RESPONSES;
Keywords:
skeletal muscle; performance; energy turnover; excitation/contraction coupling; efficiency; rat; muscle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Abbate, F Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin HumanMovement Sci, Boechorststr 9, NL-1081 BT Amsterdam, Netherlands Free Univ Amsterdam Boechorststr 9 Amsterdam Netherlands NL-1081 BT
Citazione:
F. Abbate et al., "High-frequency initial pulses do not affect efficiency in rat fast skeletal muscle", J EXP BIOL, 204(8), 2001, pp. 1503-1508

Abstract

This study investigated the effects of high-frequency initial pulses on the efficiency (=total work output/high-energy phosphate consumption) of rat fast skeletal muscle. In situ rat medial gastrocnemius muscles performed 15repeated shortening contractions (2 s(-1); velocity 50 mm s(-1)) with occluded blood how while activated with triplets of 400 Ha followed by 60 Hz trains (T400;60) or with constant-frequency trains of either 60 or 91 Hz. Allstimulation patterns consisted of sis pulses. After the last contraction, the muscles were quickly freeze-clamped and analysed for metabolite levels. The calculated efficiencies were 20.4 +/-3.0 mJ mu mol(-1) P (N=7), 19.4 +/-1.8 mJ mu mol(-1) P (N=8) and 19.6 +/-2.5 mJ mu mol(-1) P (N=7; means +/-S.D.) for T400;60, 60 and 91 Hz stimulation respectively (P >0.05). It is concluded that, although high-frequency initial pulses can enhance muscle performance, the efficiency of rat fast skeletal muscle did not differ from that for submaximal constant-frequency stimulation patterns.

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Documento generato il 01/06/20 alle ore 01:40:42