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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
Open AccessArticle

Bi-modal recovery of quadriceps femoris muscle function after sustained maximum voluntary contraction at different muscle length

Laboratory of Human Motorics, Department of Applied Physiology and Sports Medicine, Lithuanian Academy of Physical Education, Lithuania
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Medicina 2008, 44(10), 782; https://doi.org/10.3390/medicina44100098
Received: 27 November 2007 / Accepted: 6 October 2008 / Published: 11 October 2008
The aim of this study was to test the hypothesis that contractility of quadriceps femoris muscle during a 15-min period after a sustained maximum voluntary contraction for 1 min is determined by the interaction of posttetanic potentiation, metabolic fatigue, and nonmetabolic fatigue. Eleven healthy untrained men (age, 22.9±1.8 years; body weight, 77.5±5.2 kg) performed isometric 1-min maximum voluntary contraction at long (90° in knee joint) and short (135° in knee joint) muscle length at two different occasions. Contractility of quadriceps femoris muscle was monitored via the evoked contractions at 1, 10, 20, and 50 Hz and maximum voluntary contraction at short and long muscle length on both occasions. Force generating capacity was reduced immediately after 1-min maximum voluntary contraction at short and long muscle length, and then a bi-modal time-course of recovery was observed which consisted of (1) rapid recovery of all measured indexes at 3 min and (2) divergence in the changes of forces at low and high stimulation frequencies, as well as maximal voluntary contraction force at 7 and 15 min after exercising. The decline in force immediately after 1-min isometric load was caused by metabolic and nonmetabolic fatigue; however, factors related to the metabolic fatigue were prevalent. As the effect of metabolic fatigue was diminishing and posttetanic potentiation was still present, force generation capacity recovered at 3 minutes after exercising. Further dynamics of contractility can be explained by the fading influence of posttetanic potentiation and dominant effect of nonmetabolic fatigue.
Keywords: electrical stimulation; posttetanic potentiation; low-frequency fatigue; metabolic fatigue; nonmetabolic fatigue electrical stimulation; posttetanic potentiation; low-frequency fatigue; metabolic fatigue; nonmetabolic fatigue
MDPI and ACS Style

Skurvydas, A.; Masiulis, N.; Stanislovaitis, A.; Kamandulis, S. Bi-modal recovery of quadriceps femoris muscle function after sustained maximum voluntary contraction at different muscle length. Medicina 2008, 44, 782.

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