Biology of Sport
pISSN 0860-021X    eISSN 2083-1862
Archival Issues
Volume 33, 2016
Volume 32, 2015
Volume 31, 2014
Volume 30, 2013
Volume 29, 2012
Volume 28, 2011
Volume 27, 2010
Volume 26, 2009
Volume 25, 2008
Volume 24, 2007
Volume 23, 2006
Volume 22, 2005
Volume 21, 2004
Volume 20, 2003
Archival Issues 1984-1998
Information for Authors
Special Information
Journal Abstract
Minimum blood lactate and muscle protein of rats during swimming exercise
FA Voltarelli, CA Gobatto, MAR de Mello
Biol Sport 2008; 25(1):23-34
ICID: 890365
Article type: Original article
IC™ Value: 9.57
Abstract provided by Publisher
Few studies dealing with effort intensity during swimming exercise in rats have been reported in the literature. Recently, with the use of the lactate minimum test (LMT), our group estimated the minimum blood lactate (MBL) of rats during swimming exercises. This information allowed accurate evaluation of the effort intensity developed by rats during swimming exercise. The present study was designed to evaluate the effects of swimming exercise sessions in below, equivalent and above intensities to MBL, on protein metabolism of rats. Adult (90 days) sedentary male Wistar rats were used in the present study. Mean values of MBL, in the present study, were obtained at blood concentration of 6.7±0.4 mmol/L with a load of 5% bw. The animals were sacrificed at rest (R) or immediately after a single swimming session (30 min) supporting loads below (3.5% bw), equivalent (5.0% bw) and high load (6.5% bw) to AT. Blood samples were collected each 5 min of exercise for lactate determination. Soleus muscle protein synthesis (amount of L-[14C] fenil alanyn incorporation to protein) and breakdown (tyrosin release) rates were evaluated. Blood lactate concentrations (mmol/L) stabilized with the below (5.40.01) and equivalent (6.40.006) to MBL but increased, progressively, with the high load. There were no differences in protein synthesis (pmol/mg.h) among rest values (65.23.4) and after-exercise supporting the loads below (61.51.3) and the equivalent (60.7±1.7) to MBL but there was a decrease with the high load (36.6±2.0). Protein breakdown rates (pmol/g.h) increase after exercise supporting the loads below (227.0±6.1), equivalent (227.9±6.0) and high (363.6±7.1) to MBL in relation to the rest (214.3±6.0). The results indicate the viability of the application of LMT in studies with rats since it detected alterations imposed by exercise.

ICID 890365

Related articles
  • in IndexCopernicus™
         Rats [21904 related records]
         protein degradation [1 related records]
         protein synthesis [3 related records]
         Lactate minimum test [0 related records]
         Minimum blood lactate [0 related records]


    Copyright © Biology of Sport  2017
    Page created by Index Copernicus Ltd. All Rights reserved.