Bishop, David (2004) The Validity of Physiological Variables to Assess Training Intensity in Kayak Athletes. International Journal of Sports Medicine, 25 (1). pp. 68-72. ISSN 0172-4622 (print) 1439-3964 (online)

Abstract

It appears that training benefits are compromised if excessive training is performed at intensities that are either too low or too high. This suggests a need for accurate methods to monitor training intensity. It has been suggested that heart rate (HR) or lactate concentration ([La-]) can be used to accurately monitor training intensity. The purpose of the present study therefore, was to examine whether the relationship between HR, [La-] and intensity determined during a kayak graded exercise test (GXT) remained stable during constant-intensity kayak exercise. Sixteen trained kayak paddlers, (22 ± 4 y, peak V·O2 = 3.7 ± 0.9 l × min-1) performed a GXT on a wind-braked kayak ergometer. They then performed a 20-min constant-load test on the kayak ergometer at a power output corresponding to their lactate inflection (LI) intensity. Eight subjects also performed a 20-min constant-load test at a power output corresponding to their lactate threshold (LT) intensity. Differences between constant-load and GXT values were determined using one-way ANOVA (p < 0.05). There were no significant differences between values for HR and V·O2 derived from the GXT and those measured during both constant-load tests. However, while [La-] also provided a valid marker of the LI training intensity (1.8 ± 0.3 v 2.1 ± 0.8 mmol × l-1), [La-] did not provide a valid marker of the LT training intensity (3.8 ± 0.7 v 5.1 ± 1.4 mmol × l-1). These results suggest that HR, but not [La-1], is similar during both a GXT and constant-load exercise at the LT intensity.

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