Mittelstadt S W, Hoffman M D, Watts P B, O'Hagan K P, Sulentic J E, Drobish K M, Gibbons T P, Newbury V S, Clifford P S
Department of Physical Medicine and Rehabilitation, Medical College of Wisconsin, Milwaukee 53295, USA.
Med Sci Sports Exerc. 1995 Nov;27(11):1563-8.
The purpose of this experiment was to investigate the lactate responses to roller skiing with double pole and diagonal stride techniques in eight collegiate or national level cross-country ski racers. Four-minute exercise stages were performed on a ski treadmill at 67, 94, 121, 148, and 174 m.min-1 on a 1.7% grade and at 67, 94, and 121 m.min-1 on a 7.1% grade. Whole blood lactate concentration, heart rate, oxygen consumption (VO2) and rating of perceived exertion (RPE) were determined at each exercise stage. Blood lactate concentrations were not significantly different between double poling and diagonal striding at the 1.7% grade. However, the blood lactate concentrations were higher during double poling at the 7.1% grade for all speeds. Blood lactate concentrations were also higher for double poling at the 7.1% grade when compared with diagonal striding at 70% of technique specific peak VO2, a heart rate of 145 and a RPE of 12. We conclude that blood lactate concentrations do not offer physiological justification for choosing one technique over the other when skiing on low grades, but low blood lactate concentrations may provide a physiological advantage for diagonal striding on steep grades.
本实验的目的是研究8名大学或国家级越野滑雪运动员在使用双杖和斜线滑行技术进行越野滑雪时的乳酸反应。在滑雪跑步机上，以1.7%的坡度分别以67、94、121、148和174米/分钟的速度进行4分钟的运动阶段，以及以7.1%的坡度分别以67、94和121米/分钟的速度进行4分钟的运动阶段。在每个运动阶段测定全血乳酸浓度、心率、耗氧量（VO2）和主观用力程度（RPE）。在1.7%的坡度下，双杖滑行和斜线滑行之间的血乳酸浓度没有显著差异。然而，在7.1%的坡度下，所有速度的双杖滑行期间血乳酸浓度都更高。与在技术特定峰值VO2的70%、心率为145和RPE为12时的斜线滑行相比，在7.1%的坡度下双杖滑行的血乳酸浓度也更高。我们得出结论，在低坡度滑雪时，血乳酸浓度并不能为选择一种技术而非另一种技术提供生理依据，但低血乳酸浓度可能为在陡坡上斜线滑行提供生理优势。
