Relationships between muscle lactate accumulation and surface EMG activities during isokinetic contractions in man
Gespeichert in:
| Deutscher übersetzter Titel: | Die Beziehungen zwischen Muskellaktat-Akkumulation und Oberflächen-EMG-Aktivitäten während isokinetischer Kontraktionen beim Menschen |
|---|---|
| Autor: | Horita, Tomoki; Ishiko, Toshihiro |
| Erschienen in: | European journal of applied physiology |
| Veröffentlicht: | 56 (1987), 1, S. 18-23, Lit. |
| Format: | Literatur (SPOLIT) |
| Publikationstyp: | Zeitschriftenartikel |
| Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
| Sprache: | Englisch |
| ISSN: | 1439-6319, 0301-5548 |
| DOI: | 10.1007/BF00696370 |
| Schlagworte: | |
| Online Zugang: | |
| Erfassungsnummer: | PU198703028524 |
| Quelle: | BISp |
Abstract des Autors
In order to investigate the relationship between metabolic state and myoelectrical activity in working muscle during short termin intense exercise, eleven healthy males performed isokinetic knee extensions at an angular velocity of 180 deg/sec for 30 and 60 s. The median frequency (MF) of the surface electromyogram (EMG) recorded from vastus lateralis was decreased during exercise. These changes (MF and EMD) corresponded well to muscle lactate accumulation in the same muscle. Over the exercise period, the integrated EMG/knee extension peak torque ratio (E/T ratio) was increased, which indicated a decrease in the efficiency of electrical activity. It was concluded that the changes in the frequency components of the EMG and in the contractile property of the muscle during short term intense exercise correlated with lactate accumulation in the identical muscle, and that the decrease in efficiency of the electrical activity in the muscle suggested peripheral fatigue.