In:
International Journal of Sports Physiology and Performance, Human Kinetics, Vol. 7, No. 4 ( 2012-12), p. 382-389
Abstract:
Mechanical efficiency (ME) describes the ratio between mechanical ( P MECH ) and metabolic ( P MET ) power. The purpose of the study was to include an estimation of anaerobic energy expenditure (An E ) into the quantification of P MET using the accumulated oxygen deficit (AOD) and to examine its effect on the value of ME in treadmill running at submaximal, maximal, and supramaximal running speeds. Methods: Participants (N = 11) underwent a graded maximal exercise test to determine velocity at peak oxygen uptake ( v VO 2peak ). On 4 separate occasions, subjects ran for 6 min at speeds corresponding to 50%, 70%, 90%, and 110% of v VO 2peak . During each testing session, P MET was measured from pulmonary oxygen uptake (VO 2p ) using opencircuit spirometry and was quantified in 2 ways: from VO 2p and an estimate of An E (from the AOD method) and from VO 2p only. P MECH was determined from kinematic analyses. Results: ME at 50%, 70%, 90%, and 110% of v VO 2peak was 59.9% ± 11.9%, 55.4% ± 12.2%, 51.5% ± 6.8%, and 52.9% ± 7.5%, respectively, when An E was included in the calculation of P MET . The exclusion of An E yielded significantly greater values of ME at all speeds: 62.9% ± 11.4%, 62.4% ± 12.6%, 55.1% ± 6.2%, and 64.2% ± 8.4%; P = .001 (for 50%, 70%, 90%, and 110% of v VO 2peak , respectively). Conclusions: The data suggest that an estimate of An E should be considered in the computation of P MET when determining ME of treadmill running, as its exclusion leads to overestimations of ME values.
Type of Medium:
Online Resource
ISSN:
1555-0265
,
1555-0273
DOI:
10.1123/ijspp.7.4.382
Language:
Unknown
Publisher:
Human Kinetics
Publication Date:
2012
SSG:
31
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