Document Detail


Leg heating and cooling influences running stride parameters but not running economy.
MedLine Citation:
PMID:  16586333     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To evaluate the effect of temperature on running economy (RE) and stride parameters in 10 trained male runners (VO2peak 60.8 +/- 6.8 ml . kg (-1) . min (-1)), we used water immersion as a passive temperature manipulation to contrast localised pre-heating, pre-cooling, and thermoneutral interventions prior to running. Runners completed three 10-min treadmill runs at 70 % VO2peak following 40 min of randomised leg immersion in water at 21.0 degrees C (cold), 34.6 degrees C (thermoneutral), or 41.8 degrees C (hot). Treadmill runs were separated by 7 days. External respiratory gas exchange was measured for 30 s before and throughout the exercise and stride parameters were determined from video analysis in the sagittal plane. RE was not affected by prior heating or cooling with no difference in oxygen cost or energy expenditure between the temperature interventions (average VO2 3rd-10th min of exercise: C, 41.6 +/- 3.4 ml . kg (-1) . min (-1); TN, 41.6 +/- 3.0; H, 41.8 +/- 3.5; p = 0.94). Exercise heart rate was affected by temperature (H > TN > C; p < 0.001). During minutes 3 - 5 of running the respiratory-exchange and minute ventilation/oxygen consumption ratios were greater in cold compared with thermoneutral (p < 0.05). Averaged over the full 10 min of exercise, stride length was shorter and stride frequency higher for the C trial compared to TN and H (p < 0.01). Leg temperature manipulation did not influence running economy despite changes in stride parameters that might indicate restricted muscle-tendon elasticity after pre-cooling. Larger changes in stride mechanics than those produced by the current temperature intervention are required to influence running economy.
Authors:
J P Folland; D S Rowlands; R Thorp; A Walmsley
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Publication Detail:
Type:  Journal Article     Date:  2006-02-01
Journal Detail:
Title:  International journal of sports medicine     Volume:  27     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-09-28     Completed Date:  2006-12-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  771-9     Citation Subset:  IM    
Affiliation:
School of Sport and Exercise Sciences, Loughborough University, Loughborough UK. j.p.folland@lboro.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Body Temperature*
Energy Metabolism / physiology
Exercise Test
Humans
Immersion
Least-Squares Analysis
Leg / blood supply,  physiology*
Male
Oxygen Consumption / physiology*
Pulmonary Gas Exchange
Running / physiology*
Water
Chemical
Reg. No./Substance:
7732-18-5/Water

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


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