Document Detail


Mechanical Efficiency of Treadmill Running Exercise: Effect of Anaerobic Energy Contribution at Various Speeds.
MedLine Citation:
PMID:  22868489     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: Mechanical efficiency (ME) describes the ratio between mechanical (PMECH) and metabolic (PMET) power. The purpose of the study was to include an estimation of anaerobic energy expenditure (AnE) into the quantification of the PMET using the accumulated oxygen deficit (AOD) and to examine its effect on the value of ME in treadmill running at sub-, max and supra- maximal running speeds. METHODS: Participants (n = 11) underwent a graded maximal exercise test to determine velocity at peak oxygen uptake (vVO2peak). On four separate occasions, subjects ran for six minutes at speeds corresponding to 50, 70, 90, and 110% of vVO2peak . During each testing session, PMET was measured from pulmonary oxygen uptake (VO2p ) using open-circuit spirometry and was quantified in two ways: 1) from VO2p and an estimate of AnE (from the AOD) and 2) fromVO2p only. PMECH was determined from kinematic analyses. RESULTS: ME at 50, 70, 90, & 110% of vVO2peak were 59.9 ± 11.9, 55.4 ± 12.2, 51.5 ± 6.8, & 52.9 ± 7.5%, respectively when AnE was included in the calculation of PMET. The exclusion of AnE yielded significantly greater values of ME at all speeds: 62.9 ± 11.4, 62.4 ± 12.6, 55.1 ± 6.2, 64.2 ± 8.4%; p = 0.001 (for 50, 70, 90, & 110% of vVO2peak , respectively). CONCLUSIONS: Our data suggest that an estimate of AnE should be considered in the computation of PMET when determining ME of treadmill running as its exclusion leads to overestimations of ME values.
Authors:
Daniel A Keir; Raphaël Zory; Céline Boudreau-Larivière; Olivier Serresse
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-31
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
School of Human Kinetics, Laurentian University, Sudbury, Ontario, Canada.
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