Research article summary (published 27 Feb 2006):

Neuro-muscular fatigue and recovery dynamics following anaerobic interval workload.

Full Abstract

The aim of this study was to determine the influence of anaerobic running on muscle contractile characteristics and voluntary muscle activation level during MVC as well as the dynamics of their recovery during a 2-hour period. Seven well-trained runners performed 5 x 300 m at submaximal velocity with a 1-minute active recovery interval between the runs. The average run velocity was 6.69 m.s(-1), which represented 77 % of their top velocity. Contractile characteristics of the vastus lateralis and activation level of quadriceps femoris muscles were measured before and immediately after the runs and within the 120-minute time interval that followed the workload. To do this we used: single twitch, low- and high-frequency electrical stimulation, maximal voluntary knee extension test, and muscle activation level test. After the exercise the maximal twitch torque (T(TW)) decreased for 28 +/- 3.7 % (p < 0.001) and torque at stimulation with 20 Hz and 100 Hz were 19.2 +/- 4.6 % (p < 0.01) and 7.5 +/- 2.3 % (p < 0.05) lower, respectively, while MVC torque and activation level remained unchanged. Subjects with higher blood lactate accumulation level showed significant decrease in the torque at low frequency stimulation (T(F20)) (r = - 0.80; p < 0.01) and T(TW) (r = - 0.92; p < 0.01). The restoration of twitch torque took a short time despite the fact that blood lactate concentration remained high. Ten minutes after the last interval run the twitch torque exceeded the pre-workload value by 11 % (p < 0.01). Potentiation lasted until the 40th min. It was concluded that fatigue after the anaerobic interval workload was peripheral in character and caused by contractile mechanisms disturbances.

Author information

Author/s: Skof, B (B); Strojnik, V (V);

Affiliation: University of Ljubljana, Faculty of Sport, Laboratory of Biomechanics, Ljubljana, Slovenia. branko.skof(-atsign-)sp.uni-lj.si

Journal and publication information

Publication Type: Journal Article

Journal: International journal of sports medicine (Int J Sports Med), published in Germany. (Language: eng)

Reference: 2006-Mar; vol 27 (issue 3) : pp 220-5

Dates: Created 2006/03/16; Completed 2006/07/13;

PMID: 16541378, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

External Links for this article
(including full text providers, if available):

Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.

This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.

MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Anaerobic Threshold - physiology Analysis of Variance Electric Stimulation Heart Rate - physiology Humans Lactates - blood Leg - physiology

Leg - physiology Male Muscle Contraction - physiology Muscle Fatigue - physiology Muscle, Skeletal - physiology Recovery of Function - physiology Running - physiology Torque

Associated Chemicals: Lactates (0)

Related articles

These are the highest related articles currently in the database:

• The effect of two warm-up protocols on some biomechanical parameters of the neuromuscular system of middle distance runners. 29 Apr 2007
• Relationship of fatigued run and rapid stop to ground reaction forces, lower extremity kinematics, and muscle activation. 30 Aug 1994
• The slow component of VO2 in professional cyclists. 29 Sep 2000
• Effects of recovery modes after knee extensor muscles eccentric contractions. 30 Oct 2004
• Effect of recovery mode on repeated sprint ability in young basketball players. 29 Apr 2008
• [Influence of temperature on the recovery of muscle function after performing maximal intensity exercise] 30 Dec 2001
• Characteristics of shock attenuation during fatigued running. 30 Oct 2003
• Neuromuscular fatigue and recovery dynamics following prolonged continuous run at anaerobic threshold. 27 Feb 2006
• Effects of sprint duration and exercise: rest ratio on repeated sprint performance and physiological responses in professional soccer players. 29 Apr 2007
• Effects of previous dynamic arm exercise on power output during repeated maximal sprint cycling. 30 Jul 1994

See 100+ related articles.

Related Article Map

Legend: - FREE Full text Article. - Abstract only. - Title only. More help.

See a large map of 100+ related articles.