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Twitch potentiation is greater after a fatiguing submaximal isometric contraction performed at short vs. long quadriceps muscle length.
J Appl Physiol (1985). 2005 Feb; 98(2):429-36.JA

Abstract

Endurance time of a submaximal sustained contraction is longer when the muscle is fatigued in a shortened position. The aim of the present study was to compare central and peripheral mechanisms of fatigue after an isometric contraction of the knee extensor muscles performed at 20% maximal voluntary contraction (MVC) at two knee angles (35 degrees , short length vs. 75 degrees , long length; 0 degrees = full extension) until exhaustion. Eleven men (24 +/- 4 yr) attended two experimental randomized sessions. Endurance time was greater at 35 degrees compared with 75 degrees (974 +/- 457 vs. 398 +/- 144 s; P < 0.001) despite a similar reduction in knee extensor MVC (-28.4 +/- 16.0%, P < 0.001 vs. -27.6 +/- 18.8%, P < 0.001, respectively). Voluntary activation level was similarly depressed after the fatiguing contraction performed at the two muscle lengths (-19 +/- 16.7% at 35 degrees , P < 0.01 vs. -13.7 +/- 14.5% at 75 degrees , P < 0.01). After the fatiguing contraction, peak twitch potentiation was observed only at the short length (+31.8 +/- 17.6% at 35 degrees , P < 0.01 vs. +6.4 +/- 21.3% at 75 degrees , P > 0.05), whereas M-wave properties were similarly altered for the two angles. These results suggest that 1) central fatigue at task failure for a sustained isometric contraction was not dependent on the muscle length, and 2) the longer endurance time of a sustained isometric contraction performed at a shortened length is related to potentiation. It is suggested that the greater endurance time of a sustained isometric contraction observed at 35 degrees is related to the occurrence of potentiation at this short length, because central fatigue is similar at task failure for both tasks.

Authors+Show Affiliations

Institut National de la Santé et de la Recherche Médicale/Equipe de Recherche et d'Innovation Technologique 207, Motricité-Plasticité Laboratory, Faculty of Sport Sciences, University of Burgundy, Dijon, France. nicolas.place@u-bourgogne.frNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

15475602

Citation

Place, Nicolas, et al. "Twitch Potentiation Is Greater After a Fatiguing Submaximal Isometric Contraction Performed at Short Vs. Long Quadriceps Muscle Length." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 98, no. 2, 2005, pp. 429-36.
Place N, Maffiuletti NA, Ballay Y, et al. Twitch potentiation is greater after a fatiguing submaximal isometric contraction performed at short vs. long quadriceps muscle length. J Appl Physiol. 2005;98(2):429-36.
Place, N., Maffiuletti, N. A., Ballay, Y., & Lepers, R. (2005). Twitch potentiation is greater after a fatiguing submaximal isometric contraction performed at short vs. long quadriceps muscle length. Journal of Applied Physiology (Bethesda, Md. : 1985), 98(2), 429-36.
Place N, et al. Twitch Potentiation Is Greater After a Fatiguing Submaximal Isometric Contraction Performed at Short Vs. Long Quadriceps Muscle Length. J Appl Physiol. 2005;98(2):429-36. PubMed PMID: 15475602.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Twitch potentiation is greater after a fatiguing submaximal isometric contraction performed at short vs. long quadriceps muscle length. AU - Place,Nicolas, AU - Maffiuletti,Nicola A, AU - Ballay,Yves, AU - Lepers,Romuald, Y1 - 2004/10/08/ PY - 2004/10/12/pubmed PY - 2005/5/25/medline PY - 2004/10/12/entrez SP - 429 EP - 36 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J. Appl. Physiol. VL - 98 IS - 2 N2 - Endurance time of a submaximal sustained contraction is longer when the muscle is fatigued in a shortened position. The aim of the present study was to compare central and peripheral mechanisms of fatigue after an isometric contraction of the knee extensor muscles performed at 20% maximal voluntary contraction (MVC) at two knee angles (35 degrees , short length vs. 75 degrees , long length; 0 degrees = full extension) until exhaustion. Eleven men (24 +/- 4 yr) attended two experimental randomized sessions. Endurance time was greater at 35 degrees compared with 75 degrees (974 +/- 457 vs. 398 +/- 144 s; P < 0.001) despite a similar reduction in knee extensor MVC (-28.4 +/- 16.0%, P < 0.001 vs. -27.6 +/- 18.8%, P < 0.001, respectively). Voluntary activation level was similarly depressed after the fatiguing contraction performed at the two muscle lengths (-19 +/- 16.7% at 35 degrees , P < 0.01 vs. -13.7 +/- 14.5% at 75 degrees , P < 0.01). After the fatiguing contraction, peak twitch potentiation was observed only at the short length (+31.8 +/- 17.6% at 35 degrees , P < 0.01 vs. +6.4 +/- 21.3% at 75 degrees , P > 0.05), whereas M-wave properties were similarly altered for the two angles. These results suggest that 1) central fatigue at task failure for a sustained isometric contraction was not dependent on the muscle length, and 2) the longer endurance time of a sustained isometric contraction performed at a shortened length is related to potentiation. It is suggested that the greater endurance time of a sustained isometric contraction observed at 35 degrees is related to the occurrence of potentiation at this short length, because central fatigue is similar at task failure for both tasks. SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/15475602/Twitch_potentiation_is_greater_after_a_fatiguing_submaximal_isometric_contraction_performed_at_short_vs__long_quadriceps_muscle_length_ L2 - http://www.physiology.org/doi/full/10.1152/japplphysiol.00664.2004?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -