Economy of running: beyond the measurement of oxygen uptake
Economy of running: beyond the measurement of oxygen uptake
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DOI：
10.1152/japplphysiol.00307.2009
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发表时间：
2009-12-01
影响因子：
3.3
通讯作者：
MacIntosh, Brian R.
中科院分区：
文献类型：
--
作者：
Fletcher, Jared R.;Esau, Shane P.;MacIntosh, Brian R.
Fletcher JR, Esau SP, MacIntosh BR。跑步的经济性：超出了摄氧量的测量。中国生物医学工程学报（英文版）37(2):344 - 344,2009。首次发表于2009年10月15日；doi: 10.1152 / japplphysiol.00307.2009。-本研究的目的是比较一组训练有素的男性长跑运动员在三种亚最大速度下的跑步经济性，分别表示为氧气消耗(ml.kg（-1).km(-1)）和跑完给定距离所需的能量(kcal.kg（-1).km(-1)）。假设考虑到与底物利用率相关的差异，用单位热量成本来表达跑步经济性对速度的变化比氧气成本更敏感。16名训练有素的男性长跑运动员[最大摄氧量((V) / dot(O2max)) 66.5 +/- 5.6 ml.kg(-1)]。Min(-1)，体重67.9 +/- 7.3 kg，身高177.6 +/- 7.0 cm，年龄24.6 +/- 5.0岁]在电动跑步机上以0%的梯度以75%、85%和95%的乳酸门槛速度跑5分钟，各阶段之间休息5分钟。通过开路量热法测定摄氧量。平均氧耗为221 +/- 19、217 +/- 15和221 +/- 13 ml.kg（-1）。公里(1),分别。单位热量成本分别为1.05 +/- 0.09、1.07 +/- 0.08和1.11 +/- 0.07 kcal.kg（-1）。Km（-1）在三个试验速度下分别。氧耗与速度无显著性差异（P = 0.657）；然而，单位热量成本随着速度的增加而显著增加（P < 0.001）。由此得出结论，以单位热量成本表示的跑步经济性对速度的变化更为敏感，即使在按距离归一化时，也比摄氧量更有价值。
Fletcher JR, Esau SP, MacIntosh BR. Economy of running: beyond the measurement of oxygen uptake. J Appl Physiol 107: 1918-1922, 2009. First published October 15, 2009; doi:10.1152/japplphysiol.00307.2009.-The purpose of this study was to compare running economy across three submaximal speeds expressed as both oxygen cost (ml.kg(-1).km(-1)) and the energy required to cover a given distance (kcal.kg(-1).km(-1)) in a group of trained male distance runners. It was hypothesized that expressing running economy in terms of caloric unit cost would be more sensitive to changes in speed than oxygen cost by accounting for differences associated with substrate utilization. Sixteen highly trained male distance runners [maximal oxygen uptake ((V) over dot(O2max)) 66.5 +/- 5.6 ml.kg(-1).min(-1), body mass 67.9 +/- 7.3 kg, height 177.6 +/- 7.0 cm, age 24.6 +/- 5.0 yr] ran on a motorized treadmill for 5 min with a gradient of 0% at speeds corresponding to 75%, 85%, and 95% of speed at lactate threshold with 5-min rest between stages. Oxygen uptake was measured via open-circuit calorimetry. Average oxygen cost was 221 +/- 19, 217 +/- 15, and 221 +/- 13 ml.kg(-1).km(-1), respectively. Caloric unit cost was 1.05 +/- 0.09, 1.07 +/- 0.08, and 1.11 +/- 0.07 kcal.kg(-1).km(-1) at the three trial speeds, respectively. There was no difference in oxygen cost with respect to speed (P = 0.657); however, caloric unit cost significantly increased with speed (P < 0.001). It was concluded that expression of running economy in terms of caloric unit cost is more sensitive to changes in speed and is a more valuable expression of running economy than oxygen uptake, even when normalized per distance traveled.