{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T15:49:56Z","timestamp":1790092196085,"version":"4.0.1"},"reference-count":33,"publisher":"Canadian Science Publishing","issue":"1","license":[{"start":{"date-parts":[[2005,2,1]],"date-time":"2005-02-01T00:00:00Z","timestamp":1107216000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Appl. Physiol."],"published-print":{"date-parts":[[2005,2,1]]},"abstract":"<jats:p>The purpose of this study was to determine the relationship between the isocapnic buffer (\u03b2<jats:sub>isocapnic<\/jats:sub>) and hypocapnic hyperventilation (HHV) phases as well as performance in a short (20-min) and long (90-min) time trial (TT) in trained athletes. In addition, gross (GE, %) and delta (\u0394E, %) efficiency were calculated and the relationship between these variables and the average power output (W) in each TT was determined. Thirteen male endurance athletes (Mean\u2002\u00b1\u2002SD age 31\u2002\u00b1\u20026\u2002yrs; body mass 75.6\u2002\u00b1\u20026.3\u2002kg; height 185\u2002\u00b1\u20026\u2002cm) completed a continuous incremental test to exhaustion for determination of the \u03b2<jats:sub>isocapnic<\/jats:sub>and HHV phases. A second submaximal test was used to determine GE and \u0394E. The average power output (W) was measured in a 20-min and 90-min cycling TT. The \u03b2<jats:sub>isocapnic<\/jats:sub>phase (W) was significantly correlated to the average power output (W) in the 20-min TT (r\u2002=\u20020.58; p\u2002&lt;\u2002 0.05), but not in the 90-min TT (r\u2002=\u20020.28). The HHV phase (W) was not significantly correlated to the average power output in the 20-min or 90-min TT. No significant correlation was found for GE or for \u0394E and performance in the TT. The data from this study shows that \u03b2<jats:sub>isocapnic<\/jats:sub>together with HHV is not likely to be a useful indicator of cycle TT performance of 20- to 90-min duration. Furthermore, GE and \u0394E determined from a submaximal incremental stepwise test are not related to cycling TT performance of different duration. Key words: incremental, correlation, metabolism, athletes, fatigue<\/jats:p>","DOI":"10.1139\/h05-104","type":"journal-article","created":{"date-parts":[[2009,6,3]],"date-time":"2009-06-03T17:13:27Z","timestamp":1244049207000},"page":"46-60","source":"Crossref","is-referenced-by-count":17,"title":["The Isocapnic Buffering Phase and Mechanical Efficiency: Relationship to Cycle Time Trial Performance of Short and Long Duration"],"prefix":"10.1139","volume":"30","author":[{"given":"David J.","family":"Bentley","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Veronica E.","family":"Vleck","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregoire P.","family":"Millet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"155","reference":[{"key":"p_1\/p_1_1","doi-asserted-by":"crossref","first-page":"2020","DOI":"10.1152\/jappl.1986.60.6.2020","volume":"60","author":"Beaver W.L.","year":"1986","journal-title":"J. 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