Document Detail

Blood lactate and perceived exertion relative to ventilatory threshold: boys versus men.
MedLine Citation:
PMID:  9346164     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to examine blood lactate (BLa) levels and ratings of perceived exertion (RPE) in nine boys (10.5 +/- 0.7 yr) and nine men (25.3 +/- 2.0 yr) during exercise relative to ventilatory threshold (VT). VT and VO2max were determined during a graded exercise test on a cycle ergometer. On three additional days each subject exercised for 10 min at either 80, 100, or 120% of the VO2 at VT. Capillary BLa levels and RPE were assessed at minutes 5 and 10 of each trial. VO2max averaged 47.7 +/- 5.4 and 50.2 +/- 6.2 mL x g(-1) x min(-1) in the boys and men, respectively (P > 0.05). VT expressed as %VO2max was 67.2 +/- 3.5% in the boys and 67.3 +/- 4.9% in the men (P > 0.05). BLa levels ranged from 2.0 +/- 0.7 to 4.7 +/- 0.9 mmol x L(-1) in the boys and from 2.6 +/- 0.5 to 8.2 +/- 2.1 mmol x L(-1) in the men across the three intensities. Corresponding RPE values ranged from 11.2 +/- 1.8 to 16.2 +/- 2.2 in the boys and from 10.2 +/- 1.2 to 15.8 +/- 1.7 in the men. A group x time x intensity interaction (P < 0.05) indicated that BLa in the men increased more so across time and intensity. There were no significant group difference or interactions involving RPE during exercise. Setting exercise intensity relative to VT did not abolish child-adult differences with respect to submaximal BLa levels. Despite maintaining lower BLa levels, RPE values were similar between boys and men.
A D Mahon; G E Duncan; C A Howe; P Del Corral
Related Documents :
8256884 - Breathlessness during acute bronchoconstriction in asthma. pathophysiologic mechanisms.
8082364 - Analysis of the inspiratory flow-volume curve. should it always precede the forced expi...
23724804 - Dairy cows welfare quality in tie-stall housing system with or without access to exercise.
3172574 - Comparison of objective methods for determining ventilatory threshold.
12733674 - Exertional heat illness in air force basic military trainees.
8964814 - Exercise-induced changes in local cerebral glucose utilization in the rat.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  29     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1997 Oct 
Date Detail:
Created Date:  1997-11-25     Completed Date:  1997-11-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1332-7     Citation Subset:  IM; S    
Human Performance Laboratory, Ball State University, Muncie, IN 47306, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Anaerobic Threshold / physiology*
Analysis of Variance
Exercise / physiology*
Exercise Test
Lactic Acid / blood*,  metabolism
Muscles / metabolism
Oxygen Consumption*
Perception / physiology*
Physical Fitness
Ventilation-Perfusion Ratio
Reg. No./Substance:
50-21-5/Lactic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effect of casting on forearm resistance vessels in young men.
Next Document:  Exercise effect on canine and miniswine cardiac catecholamines and enkephalins.