Beneke Ralph, Weber Tobias G J, Leithäuser Renate M
Int J Sports Physiol Perform. 2018 Jan 1;13(1):64-68. doi: 10.1123/ijspp.2016-0555. Epub 2018 Jan 17.
Effects of different cycling cadences (revolutions/min [rpm]) on metabolic rate, blood lactate concentration (BLC), and reliance on carbohydrate (CHO) defined as the fraction of oxygen uptake used for CHO oxidation (relCHO) are highly individual. Whether this depends on the individually maximal achievable rpm obtained at minimized cycling resistance (rpm) is unknown. The authors tested the hypotheses that the individual freely chosen rpm in an incremental cycle-ergometer test (ILT) and relCHO at given BLC levels both depend on rpm. Seven master cyclists and 8 not specifically trained leisure athletes performed an ILT at individually freely chosen rpm and an rpm test. Respiratory data and BLC were measured; relCHO was plotted as a function of the BLC for the determinations of the individual BLC at relCHO of 75% and 95% (BLC75% and BLC95%). With 16.7%, the between-subjects variability of individual rpm was high but independent from rpm. In the master athletes, rpm explained 59.3% and 95.2% of BLC75% (P = .043) and BLC95% (P = .001), respectively. Irrespective of cycling experience, the individually preferred average rpm at submaximal stages of an ILT is highly variable and independent of rpm. In experienced cyclists, carbohydrate management defined as the ratio between substrate availability as indicated by BLC and relCHO depends on rpm.
不同骑行踏频（转/分钟[rpm]）对代谢率、血乳酸浓度（BLC）以及碳水化合物（CHO）依赖程度（定义为用于CHO氧化的摄氧量分数，即relCHO）的影响具有高度个体差异。这是否取决于在最小骑行阻力下获得的个体最大可达到的rpm尚不清楚。作者检验了以下假设：在递增式自行车测功仪测试（ILT）中个体自由选择的rpm以及给定BLC水平下的relCHO均取决于rpm。七名专业自行车运动员和八名未经专门训练的休闲运动员以个体自由选择的rpm进行了ILT和一次rpm测试。测量了呼吸数据和BLC；绘制relCHO与BLC的函数关系图，以确定relCHO为75%和95%时的个体BLC（BLC75%和BLC95%）。个体rpm的受试者间变异性为16.7%，较高但与rpm无关。在专业运动员中，rpm分别解释了BLC75%（P = 0.043）和BLC95%（P = 0.001）的59.3%和95.2%。无论骑行经验如何，在ILT次最大强度阶段个体偏好的平均rpm高度可变且与rpm无关。在有经验的自行车运动员中，碳水化合物管理（定义为BLC和relCHO所指示的底物可用性之间的比率）取决于rpm。
