Evidence of cardiac functional reserve upon exhaustion during incremental exercise to determine VO2max

Elliott, Adrian, Skowno, Justin, Prabhu, Mahesh, Noakes, Timothy and Ansley, Les (2015) Evidence of cardiac functional reserve upon exhaustion during incremental exercise to determine VO2max. British Journal of Sports Medicine, 49 (2). pp. 128-132. ISSN 0306-3674

PDF (Article)
Br_J_Sports_Med-2013-Elliott-bjsports-2012-091752.pdf - Accepted Version

Download (156kB) | Preview
Official URL: http://dx.doi.org/10.1136/bjsports-2012-091752


Background - There remains considerable debate regarding the limiting factor(s) for maximal oxygen uptake (VO2max). Previous studies have shown that the central circulation may be the primary limiting factor for VO2max and that cardiac work increases beyond VO2max.

Aim - We sought to evaluate whether the work of the heart limits VO2max during upright incremental cycle exercise to exhaustion.

Methods - Eight trained men completed two incremental exercise trials, each terminating with exercise at two different rates of work eliciting VO2max (MAX and SUPRAMAX). During each exercise trial we continuously recorded cardiac output using pulse-contour analysis calibrated with a lithium dilution method. Intra-arterial pressure was recorded from the radial artery while pulmonary gas exchange was measured continuously for an assessment of oxygen uptake.

Results - The workload during SUPRAMAX (mean±SD: 346.5±43.2 W) was 10% greater than that achieved during MAX (315±39.3 W). There was no significant difference between MAX and SUPRAMAX for Q (28.7 v 29.4 L/min) or VO2 (4.3 vs 4.3 L/min). Mean arterial pressure was significantly higher during SUPRAMAX, corresponding to a higher cardiac power output (8.1 vs 8.5 W; p<0.06).

Conclusions - Despite similar VO2 and Q, the greater cardiac work during SUPRAMAX supports the view that the heart is working submaximally at exhaustion during an incremental exercise test (MAX).

Item Type: Article
Additional Information: Published online before print.
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Linda Barlow
Date Deposited: 15 Feb 2013 09:44
Last Modified: 17 Dec 2023 14:15
URI: https://nrl.northumbria.ac.uk/id/eprint/11143

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics