Anaerobic threshold, individual anaerobic threshold, and maximal lactate steady state in rowing

The anaerobic threshold is a physiologic event studied in various species. There are various methods for its assessment, recognized in the human and equine exercise physiology literature, several of these involving the relationship between blood lactate concentration (LAC) and exercise load, measured in a standardized exercise test. The aim of this study was to compare four of these methods: V2, V4, individual anaerobic threshold (IAT) and lactate minimum speed (LMS) with the method recognized as the gold standard for the assessment of anaerobic threshold, maximal lactate steady-state (MLSS). The five tests were carried out in thirteen trained Arabian horses, in which velocities and associated LAC could be measured. The mean velocities and the LAC associated with the anaerobic threshold for the five methods were respectively: V2 = 9.67±0.54; V4 = 10.98±0.47; V IAT = 9.81±0.72; V LMS = 7.50±0.57 and V MLSS = 6.14±0.45m.s-1 and LAC IAT = 2.17±0.93; LAC LMS = 1.17±0.62 and LAC MLSS = 0.84±0.21mmol.L-1. None of the velocities were statistically equivalent to V MLSS (P<0.05). V2, V4 and V LMS showed a good correlation with V MLSS , respectively: r = 0.74; r = 0.78 and r = 0.83, and V IAT did not significantly correlate with V MLSS. Concordance between the protocols was relatively poor, i.e., 3.28±1.00, 4.84±0.30 and 1.43±0.32m.s-1 in terms of bias and 95% agreement limits for V2, V4 and LMS methods when compared to MLSS. Only LAC LMS did not differ statistically from LAC MLSS. Various authors have reported the possibility of the assessment of anaerobic threshold using rapid protocols such as V4 and LMS for humans and horses. This study corroborates the use of these tests, but reveals that adjustments in the protocols are necessary to obtain a better concordance between the tests and the MLSS.

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Lack of concordance amongst measurements of individual anaerobic threshold and maximal lactate steady state on a cycle ergometer

The Physician and Sportsmedicine ◽

10.1080/00913847.2016.1122501 ◽

2015 ◽

Vol 44 (1) ◽

pp. 34-45 ◽

Cited By ~ 6

Author(s):

Iñaki Arratibel-Imaz ◽

Julio Calleja-González ◽

Jose Ignacio Emparanza ◽

Nicolas Terrados ◽

Jeffrey M. Mjaanes ◽

...

Keyword(s):

Steady State ◽

Anaerobic Threshold ◽

Cycle Ergometer ◽

Maximal Lactate Steady State ◽

Individual Anaerobic Threshold

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Anaerobic Threshold: The Concept and Methods of Measurement

Canadian Journal of Applied Physiology ◽

10.1139/h03-023 ◽

2003 ◽

Vol 28 (2) ◽

pp. 299-323 ◽

Cited By ~ 207

Author(s):

Krista Svedahl ◽

Brian R. MacIntosh

Keyword(s):

Lactic Acid ◽

Steady State ◽

Anaerobic Threshold ◽

Oxygen Delivery ◽

Lactate Threshold ◽

Ventilatory Threshold ◽

Lactic Acid Production ◽

Maximal Lactate Steady State ◽

Individual Anaerobic Threshold ◽

Intensity Of Exercise

The anaerobic threshold (AnT) is defined as the highest sustained intensity of exercise for which measurement of oxygen uptake can account for the entire energy requirement. At the AnT, the rate at which lactate appears in the blood will be equal to the rate of its disappearance. Although inadequate oxygen delivery may facilitate lactic acid production, there is no evidence that lactic acid production above the AnT results from inadequate oxygen delivery. There are many reasons for trying to quantify this intensity of exercise, including assessment of cardiovascular or pulmonary health, evaluation of training programs, and categorization of the intensity of exercise as mild, moderate, or intense. Several tests have been developed to determine the intensity of exercise associated with AnT: maximal lactate steady state, lactate minimum test, lactate threshold, OBLA, individual anaerobic threshold, and ventilatory threshold. Each approach permits an estimate of the intensity of exercise associated with AnT, but also has consistent and predictable error depending on protocol and the criteria used to identify the appropriate intensity of exercise. These tests are valuable, but when used to predict AnT, the term that describes the approach taken should be used to refer to the intensity that has been identified, rather than to refer to this intensity as the AnT. Key words: maximal lactate steady state, lactate threshold, ventilatory threshold, OBLA, individual anaerobic threshold

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