Higher rate of fat oxidation during rowing compared to cycling ergometer exercise across a range of exercise intensities

Brendan Egan, Paul L O'Connor

Research output: Contribution to journalArticlepeer-review

Abstract

The relative contribution of carbohydrate and fat oxidation to energy expenditure during exercise is dependent on variables including exercise intensity, mode, and recruited muscle mass. This study investigated patterns of substrate utilization during two non‐weightbearing exercise modalities, namely cycling and rowing. Thirteen young, moderately trained males performed a continuous incremental (3‐min stages) exercise test to exhaustion on separate occasions on an electronically braked cycle (CYC ) ergometer and an air‐braked rowing (ROW ) ergometer, respectively. On two further occasions, participants performed a 20‐min steady‐state exercise bout at ∼50%VO<sub>2peak</sub> on the respective modalities. Despite similar oxygen consumption, rates of fat oxidation (FAT<sub>ox</sub> ) were ∼45% higher during ROW compared with CYC (<i>P </i> < 0.05) across a range of power output increments. The crossover point for substrate utilization occurred at a higher relative exercise intensity for ROW than CYC (57.8 ± 2.1 vs 42.1 ± 3.6%VO<sub>2peak</sub> , <i>P </i> < 0.05). During steady‐state submaximal exercise, the higher FAT<sub>ox</sub> during ROW compared with CYC was maintained (<i>P </i> < 0.05), but absolute FAT<sub>ox</sub> were 42% (CYC ) and 28% (ROW ) lower than during incremental exercise. FAT<sub>ox</sub> is higher during ROW compared with CYC exercise across a range of exercise intensities matched for energy expenditure, and is likely as a consequence of larger muscle mass recruited during ROW .
Original languageEnglish
Pages (from-to)630-637
JournalScandinavian Journal of Medicine & Science in Sports
Volume26
Issue number6
StatePublished - Jun 9 2015

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