Twitch potentiation after voluntary versus electrically induced isometric contractions in human knee extensor muscles

被引：43

作者：

Requena, Bernardo ^{[1
]}

Gapeyeva, Helena ^{[2
]}

Garcia, Inmaculada ^{[1
]}

Ereline, Jaan ^{[2
]}

Paasuke, Mati ^{[2
]}

机构：

[1] Univ Pablo Olavide, Fac Sport, Human Performance Lab, Seville 41013, Spain

[2] Univ Tartu, Inst Exercise Biol & Physiotherapy, EE-51014 Tartu, Estonia

来源：

EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY | 2008年 / 104卷 / 03期

关键词：

postactivation potentiation; human knee extensor muscles; electrical stimulation; twitch contraction;

D O I：

10.1007/s00421-008-0793-8

中图分类号：

Q4 [生理学];

学科分类号：

071003 ;

摘要：

Twitch potentiation in knee extensor (KE) muscles after a 7-s conditioning isometric maximal voluntary contraction (MVC trial), submaximal (25% MVC) voluntary contraction (SVC trial) and submaximal tetanic contraction (25% MVC) induced by percutaneous electrical stimulation at 100 Hz (PES trial) was compared in 12 men aged 19-25 years. Isometric twitch characteristics of KE muscles were measured before conditioning contraction and following 10-min recovery by supramaximal electrical stimulation of the femoral nerve. During MVC trial, twitch peak torque (Pt) potentiated (P < 0.05) immediately after the conditioning contraction with sharp decline during the first and third minute of recovery. No significant potentiation of twitch Pt was observed in SVC trial. During PES trial, twitch Pt was potentiated (P < 0.05) within 3-10 min of recovery. The time-course of isometric twitch was not significantly altered by conditioning contractions. It was concluded that twitch potentiation in the KE muscles differed markedly following the three conditioning contractions.

引用

页码：463 / 472

页数：10

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