Effects of contraction duration on low-frequency fatigue in voluntary and electrically induced exercise of quadriceps muscle in humans

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MARC

Ratkevicius, ADepartment of Physiology and Biochemistry, Lithuanian Institute of Physical Education, Kaunas (author)

Effects of contraction duration on low-frequency fatigue in voluntary and electrically induced exercise of quadriceps muscle in humans

Article/chapterEnglish1998

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Springer Science and Business Media LLC,1998

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LIBRIS-ID:oai:lup.lub.lu.se:ef51ea0b-4648-4b2c-bc6a-dbd9aeef1359
https://lup.lub.lu.se/record/1113546URI
https://doi.org/10.1007/s004210050361DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-12713URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

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Upprättat; 1998; 20071002 (lotfra)
The aims of this study were to investigate if low-frequency fatigue (LFF) dependent on the duration of repeated muscle contractions and to compare LFF in voluntary and electrically induced exercise. Male subjects performed three 9-min periods of repeated isometric knee extensions at 40% maximal voluntary contraction with contraction plus relaxation periods of 30 plus 60 s, 15 plus 30 s and 5 plus 10 s in protocols 1, 2 and 3, respectively. The same exercise protocols were repeated using feedback-controlled electrical stimulation at 40% maximal tetanic torque. Before and 15 min after each exercise period, knee extension torque at 1, 7, 10, 15, 20, 50 and 100 Hz was assessed. During voluntary exercise, electromyogram root mean square (EMGrms) of the vastus lateralis muscle was evaluated. The 20-Hz torque:100-Hz torque (20:100 Hz torque) ratio was reduced more after electrically induced than after voluntary exercise (P < 0.05). During electrically induced exercise, the decrease in 20:100 Hz torque ratio was gradually (P < 0.05) reduced as the individual contractions shortened. During voluntary exercise, the decrease in 20:100 Hz torque ratio and the increase in EMGrms were greater in protocol 1 (P < 0.01) than in protocols 2 and 3, which did not differ from each other. In conclusion, our results showed that LFF is dependent on the duration of individual muscle contractions during repetitive isometric exercise and that the electrically induced exercise produced a more pronounced LFF compared to voluntary exercise of submaximal intensity. It is suggested that compensatory recruitment of faster-contracting motor units is an additional factor affecting the severity of LFF during voluntary exercise.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Kirurgi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Surgery hsv//eng
MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Neurologi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Neurology hsv//eng
Electrical stimulation
Fatigue
Muscle contraction
Muscles

Added entries (persons, corporate bodies, meetings, titles ...)

Skurvydas, ADepartment of Physiology and Biochemistry, Lithuanian Institute of Physical Education, Kaunas (author)
Povilonis, EDepartment of Physiology and Biochemistry, Lithuanian Institute of Physical Education, Kaunas (author)
Quistorff, BDepartment of Physiology and Biochemistry, Lithuanian Institute of Physical Education, Kaunas (author)
Lexell, JanLund University,Lunds universitet,Neurokirurgi,Sektion IV,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Neurosurgery,Section IV,Department of Clinical Sciences, Lund,Faculty of Medicine(Swepub:ltu)janlex (author)
Department of Physiology and Biochemistry, Lithuanian Institute of Physical Education, KaunasNeurokirurgi (creator_code:org_t)

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In:European Journal of Applied Physiology and Occupational Physiology: Springer Science and Business Media LLC77:5, s. 462-4680301-55481439-63191439-63271432-1025

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By the author/editor: Ratkevicius, A; Skurvydas, A; Povilonis, E; Quistorff, B; Lexell, Jan

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Surgery

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