Author/Editor		Kerševan, K; Valenčič, V; Knez, N
Title		Fatigue process of type I and type II muscle fibers
Type		članek
Source		In: Mayr W, Bijak M, Jancik C, editors. Proceedings of the 7th Vienna international workshop on functional electrical stimulation; 2001 Sep 12-15: Vienna. Vienna: Department of biomedical engineering and physics University of Vienna,
Publication year		2001
Volume		str. 106-9
Language		eng
Abstract		Skeletal muscles fatigue process was examined in muscles biceps brachii and tibialis anterior in 9 male subjects, aged 21-24 years. Measurements were performed under isometric conditions. Pulse trains (0.1 ms) of different stimulation frequencies and voltage (40-50 V above threshold) were used for 10 s bipolar electrical stimulation. The non-invasive tensiomyographic (TMG) method was used for detection of muscle responses to electrical stimulation. Using pulse trains of different frequencies enabled separate observation of fatigue and tetanization process for both muscle fibre types: Type I (fatigue resistant) muscle fibres exerted and retained force throughout the 10 s electrical stimulation. Fatigue process was observed at stimulation frequency of 2 Hz but the type I muscle fibre fatigue did not occur due to their fatigue resistant character. Complete tetanus of type I muscle fibres was noticed at stimulation frequencies of 4-6 Hz. Fatigue process of type II (fast fatigue) muscle fibres ended before the electrical stimulation was over and was noticed at stimulation frequencies of 7.5-9 Hz. Complete tetanus of type II muscle fibres was noticed at stimulation frequencies higher than 18 Hz. Separate observation of type II muscle fibres enables more efficient treatment and observation of pathological changes in dystrophic, atrophic and denervated patients and also helps professional athletes and their trainers to improve their training technique.
Descriptors		MUSCLE, SKELETAL MUSCLE FATIGUE MUSCLE CONTRACTION MUSCLE FIBERS, FAST-TWITCH ELECTRIC STIMULATION ADULT