Coen B, Urhausen A, Kindermann W
Institute of Sports- and Preventive Medicine, University of Saarland, Saarbrücken, Germany.
Int J Sports Med. 2001 Jan;22(1):8-16. doi: 10.1055/s-2001-11332.
The present study was designed in order to examine the objectivity and reliability of the individual anaerobic threshold (IAT) as well as its resistance against several interfering factors: missing exhaustion, preliminary exercise, longer step duration, and lower speed increment. 87 male and 24 female runners and triathletes were examined. They performed both the original test procedure (IAT(3/2); 3 min step duration, 2 km x h(-1) increment until volitional exhaustion) and either a retest or one of several alternative test procedures (submaximal, preliminary exercise, 5 min step duration, 1 km x h(-1) increment) to be compared with IAT(3/2). The graphic determination of the IAT is characterized by a low inter-observer-variability without significant differences between 4 independent blinded examiners. Both the lactate performance curve (p = 0.07) as well as the heart rate performance curve (p = 0.05) show a slight shift to higher velocities during the retest. The IAT shows an identical running velocity during the retest, the heart rate tends to be lower, and the lactate concentration is significantly (by 0.26 mmol x l(-1); p < 0.05) lower than during the first test. Both a low degree of exhaustion (3-6 mmol x l(-1) lactate; IAT(3/2) shortened by 180 s) and an extension of the step duration from 3 to 5 min do not lead to significantly different velocities at the IAT. Moderate preliminary exercises (approximately 4 mmol x l(-1) lactate) do not influence the velocity at the IAT, the heart rate is significantly higher. A reduction of the speed increment from 2 to 1 km x h(-1) significantly increases the velocity at the IAT by 6%. It is concluded that the determination of the IAT is highly objective, reliable and insensitive to changes of the incremental graded testing protocol, such as a previous warm-up, an extension of the step duration from 3 to 5 min as well as a lower degree of exhaustion. Significant differences may only arise from changes in the speed increment.
本研究旨在检验个体无氧阈（IAT）的客观性和可靠性，以及其对几种干扰因素的抵抗能力：未达力竭、预运动、更长的步幅持续时间和更低的速度增量。对87名男性和24名女性跑步运动员及铁人三项运动员进行了检测。他们既进行了原始测试程序（IAT(3/2)；步幅持续时间3分钟，速度增量2 km·h⁻¹直至自愿力竭），又进行了重测或几种替代测试程序之一（次最大强度、预运动、步幅持续时间5分钟、速度增量1 km·h⁻¹），以便与IAT(3/2)进行比较。IAT的图形测定具有观察者间低变异性的特点，4名独立的盲法检测者之间无显著差异。重测期间，乳酸性能曲线（p = 0.07）以及心率性能曲线（p = 0.05）均显示向更高速度有轻微偏移。重测期间IAT显示相同的跑步速度，心率趋于更低，且乳酸浓度显著低于首次测试（低0.26 mmol·L⁻¹；p < 0.05）。低程度的力竭（乳酸浓度3 - 6 mmol·L⁻¹；IAT(3/2)缩短180秒）以及步幅持续时间从3分钟延长至5分钟，在IAT时均未导致显著不同的速度。适度的预运动（乳酸浓度约4 mmol·L⁻¹）不影响IAT时的速度，心率显著更高。速度增量从2 km·h⁻¹降至1 km·h⁻¹显著使IAT时的速度提高6%。得出的结论是，IAT的测定高度客观、可靠，并且对递增分级测试方案的变化不敏感，例如先前的热身、步幅持续时间从3分钟延长至5分钟以及较低程度的力竭。显著差异可能仅源于速度增量的变化。
