Abstract：
:The exercise intensity eliciting maximal fat oxidation (Fat(max)) is typically determined during an incremental test. Its reproducibility, however, has not been thoroughly investigated so far. To address this issue, 21 healthy subjects (23.5+/-1.7 years; BMI 22.4+/-1.8 kg/m(2); VO(2peak) 47.4+/-11.3 mL/min/kg) carried out two identical cycling tests to determine Fat(max) after an initial incremental baseline test. The duration of each of five stages during the Fat(max) tests was 6 min. The first stage equalled the first increase in blood lactate during the baseline test; the highest stage corresponded to a respiratory exchange ratio of 1.00. Between these intensities the other three stages were distributed evenly. Fat(max) was 28.0+/-8.6 L/min (59.2+/-18.1% VO(2peak)) in the first test and 29.8+/-10.5 L/min (62.9+/-22.2% VO(2peak)) in the second one. There was no significant difference between both Fat(max) determinations [number of stage: P=0.31; total VO(2): P=0.20; VO(2) utilized for fat oxidation (VO(2Fat)): P=0.33]. Linear correlation coefficients between tests were r=0.84 (total VO(2); P<0.001) and r=0.83 (VO(2Fat); P<0.001). However, Bland-Altman plots revealed wide 95% limits of agreement of 0.91 L/min (total VO(2)) and 0.32 L/min (VO(2Fat)). In conclusion, spontaneous intraindividual variability in Fat(max) appears too large to recommend the use of this parameter for the prescription of training intensity.
journal_name
Scand J Med Sci Sportsjournal_title
Scandinavian journal of medicine & science in sportsauthors
Meyer T,Folz C,Rosenberger F,Kindermann Wdoi
10.1111/j.1600-0838.2008.00775.xsubject
Has Abstractpub_date
2009-04-01 00:00:00pages
213-21issue
2eissn
0905-7188issn
1600-0838pii
SMS775journal_volume
19pub_type
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