title: Metabolic consequences of resistive force selection during cycle ergometry exercise.
abstract: The purpose of this study was to compare power outputs and blood lactate concentrations ([La-]B) following 30 s of maximal cycle ergometry when resistive forces were derived from total-body mass (TBM) or fat-free mass (FFM). Differences (P < 0.05) in peak power output (PPO), pedal velocity (PV) and resistive forces (RF) were observed when the TBM and FFM protocols were compared (953 +/- 114 W vs. 1020 +/- 134 W; 134 +/- 8 rpm vs. 141 +/- 7 rpm; 6 +/- 1 kg vs. 5 +/- 1 kg, respectively). Blood lactate values ([La-]B) increased (P < 0.01) postexercise for both protocols and were significantly greater for TBM (10.6 +/- 1.2 mmol.l-1 vs 11.6 +/- 1.1 mmol.l-1, P < 0.05). These findings indicate that the FFM resistive force protocol may maximise adenosinotriphosphate-phosphocreatine (ATP-PC) utilisation with smaller contributions from anaerobic glycolysis when compared with TBM. These results may have important implications in the assessment of high intensity exercise performance.
authors: Health and Exercise Science Research Laboratory, School of Applied Science, University of Glamorgan, Pontypridd, Wales. jsbaker@glam.ac.uk
authors: Julien S
authors: JS
authors: Baker
authors: Michael R
authors: MR
authors: Graham
authors: Bruce
authors: B
authors: Davies
mesh_terms: D000273:Adipose Tissue; D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001823:Body Composition; D018592:Cross-Over Studies; D015444:Exercise / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000032:analysis / Q000097:blood / Q000378:metabolism*; D008297:Male; D005082:Physical Exertion / Q000502:physiology; D014852:Wales
chemical_list: D019344:Lactic Acid