International Journal of Sports Physiology and Performance
International Journal of Sports Physiology and Performance
4 years ago

Effects of Varying the Step Duration on the Determination of Lactate Thresholds in Elite Rowers.

Sarah M Woolford, Pitre C Bourdon, Jonathan D Buckley
This study aimed to identify the minimum increment duration required to accurately assess two distinct lactate thresholds. Twenty-one elite rowers (12 female, 9 males) each performed 8-9 rowing tests comprising: 1) five progressive incremental tests (3, 4, 5, 7 or 10 min steps); and 2) at least three 30-min constant-intensity maximal lactate steady state (MLSS) assessments. Power output (PO) at lactate threshold 1 (LT1) was higher in the 3- and 4-min incremental tests. No other measures were different for LT1. PO at the second lactate threshold (LT2) was different between most tests and was higher than the PO at MLSS except for the 10-min incremental test. LT2 Oxygen consumption (V̇O2) was higher in the 3-, 4- and 5-min tests but heart rate (HR) and rating of perceived exhaustion were not different between tests. Peak PO in the incremental tests was inversely related to the step durations (r(2) = 0.86, p ≤ 0.02). Peak V̇O2 was higher in the shorter (≤ 5 min) compared with the longer incremental tests (≥ 7 min), while peak HR was not different between tests. These data suggest that for the methods used in this study: 1) incremental exercise tests with step durations ≤ 7 min overestimate MLSS exercise intensity; 2) Peak physiological values are best determined using incremental tests with step durations ≤ 4 min; and 3) HR measures are not affected by step duration and therefore prescription of training HRs can be made using any of these tests.

Publisher URL: http://doi.org/10.1123/ijspp.2017-0258

DOI: 10.1123/ijspp.2017-0258

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