Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2012) 11, 89 - 94

Research article
Is the Critical Running Speed Related to the Intermittent Maximal Lactate Steady State?
Ricardo D. de Lucas , Naiandra Dittrich, Rubens B. Junior, Kristopher M. de Souza, Luiz Guilherme A. Guglielmo
Author Information
Sports Center, Federal University of Santa Catarina, Physical effort Laboratory, Florianópolis, Brazil

Ricardo D. de Lucas
✉ Sports Center, Federal University of Santa Catarina, Physical effort Laboratory, Florianópolis, Brazil
Email: ricardo@tridantas.com.br
Publish Date
Received: 25-11-2011
Accepted: 17-09-2012
Published (online): 01-03-2012
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ABSTRACT

The purpose of the present study was to compare the critical speed (CS) with the speed at the maximal lactate steady state (vMLSS) determined by a continuous and an intermittent model in trained runners. Eight male endurance runners (30.3 ± 10.6 years; 65.0 ± 8.5 kg; 1.73 ± 0.6 m; 11.3 ± 4.0% body fat) volunteered for this investigation and performed an incremental treadmill test, as well as 2-5 30-min constant speed tests to determine the MLSS continuous and MLSS intermittent (5 min of running, interspaced by 1 min of passive rest). The CS was determined by 2 maximal running efforts of 1500 and 3000 m performed on a 400 m running track. The CS was calculated as the slope of the linear regression of distance versus time. Statistical analysis revealed no significant difference between CS and MLSS determined by intermittent running (15.2 ± 1.0 km·h-1 vs. 15.3 ± 0.7 km·h-1, respectively), however, both were significantly higher than continuous MLSS (14.4 ± 0.6 km·h-1). There was also a significant correlation between CS and MLSS intermittent (r = 0.84, p = 0.008). On the basis of the present results, we conclude that for practical reasons (low cost, non-invasive) the CS is an interesting and alternative method to prescribe endurance interval training at maximal lactate steady state intensity, in preference to a continuous protocol.

Key words: Maximal lactate steady state, critical speed, interval training


           Key Points
  • Critical running speed (CS) is related to the intermittent maximal lactate steady state using work: rest ratio of 5:1.
  • CS can be used to prescribe interval training at maximal lactate steady state speed.
  • A reduction of 6% of CS can be useful to predict MLSS and for prescribing continuous training sessions.
 
 
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