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The effects of exercise modality on the incidence of plateau at V · O 2 max
Author(s) -
Gordon Dan,
Mehter Mashihullah,
Gernigon Marie,
Caddy Oliver,
Keiller Don,
Barnes Richard
Publication year - 2012
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/j.1475-097x.2012.01142.x
Subject(s) - medicine , treadmill , incidence (geometry) , plateau (mathematics) , cadence , analysis of variance , significant difference , metabolic equivalent , cardiology , physical therapy , zoology , physical activity , physical medicine and rehabilitation , mathematics , mathematical analysis , geometry , biology
Summary The purpose of this study was to determine the effect of exercise modality on the incidence of plateau atV ·O 2 max. Twelve recreationally active men (age, 21·7 ± 2·3 year; mass, 74·8 ± 6·5 kg; height, 177·6 ± 5·6 cm) completed four incremental tests to volitional exhaustion, of which two were completed on a treadmill ( TRE ) and two were completed using a cycle ergometer ( CYC ). The work rate employed for CYC was 1 W·2 s −1 from an initial loading of 100 W with cadence being maintained at 60 rpm. For TRE , the workload (gradient) increased at a rate of 0·5% · 30 s −1 while maintaining a constant running speed of 10 kph. Throughout all the trials,V ·O 2was determined on a breath‐by‐breath basis using a precalibrated metabolic cart. The criteria adopted for determination of a plateau was a ΔV ·O 2over the final two consecutive 30‐s sampling periods of ≤50 ml · min −1 . Averaging across the two trials per each exercise modality showed a significant difference for plateau incidence between CYC (8%) and TRE (58%) ( P = 0·017). This was aligned with a significant difference in the slope of the regression line during the final 60 s of theV ·O 2 max test, CYC (99·9 ± 49·7 ml · min −1 ) and TRE (49·6 ± 42·6 ml · min −1 ) ( P = 0·017). Repeat measures ANOVA of these data suggests that plateau incidence rates atV ·O 2 max differ between treadmill‐ and cycle ergometry‐based exercises. Future studies need to address whether these response rates are replicated in well‐trained athletes.