Westblad P, Svedenhag J, Rolf C
Section of Sports Medicine, Huddinge University Hospital, Karolinska Institute, Stockholm, Sweden.
Int J Sports Med. 1996 Feb;17(2):134-9. doi: 10.1055/s-2007-972821.
The validity of isokinetic knee extensor endurance measurements with reference to treadmill running capacities was investigated. Nine male elite middle-distance runners completed a test consisting of 100 repetitive maximal eccentric and 100 concentric knee extensor actions where peak torque (Nm) and work (J) were measured. On a different day, submaximal and maximal treadmill tests were performed. Stepwise regression analysis was applied to determine the isokinetic variables with the greatest influence on the selected treadmill running capacities, including submaximal oxygen uptake (VO(2)) and maximal blood lactate. Eccentric total work was significantly and negatively related to submaximal VO(2) at all three running velocities investigated (12, 14, and 15 km.h(-1)). The R(2) values ranged from 0.48-0.59 for V0(2) ml.kg(-0.75).min(-1), indicating that 48-59 % of the variability in VO(2) ml.kg(-0.75).min(-1) could be accounted for by eccentric total work. The corresponding R(2) values for VO in ml.kg(-1).min(-1) were 0.50-0.58. Concentric relative endurance was significantly and negatively related to maximal blood lactate (R(2) = 0.73). This study has shown that isokinetic knee extensor endurance measurements of eccentric total work and concentric relative endurance are substantially related to measures of treadmill running capacity, as expressed by submaximal V02 and maximal blood lactate. It is suggested that these isokinetic measures may be used to evaluate specified running capacities in male elite middle-distance runners.
研究了等速膝关节伸展耐力测量相对于跑步机跑步能力的有效性。九名男性精英中长跑运动员完成了一项测试，该测试包括100次重复性最大离心和100次向心膝关节伸展动作，测量了峰值扭矩（Nm）和功（J）。在另一天，进行了次最大和最大跑步机测试。应用逐步回归分析来确定对等速变量影响最大的选定跑步机跑步能力，包括次最大摄氧量（VO₂）和最大血乳酸。在所有三个研究的跑步速度（12、14和15 km·h⁻¹）下，离心总功与次最大VO₂呈显著负相关。对于V0₂ ml·kg⁻⁰·⁷⁵·min⁻¹，R²值范围为0.48 - 0.59，表明VO₂ ml·kg⁻⁰·⁷⁵·min⁻¹中48 - 59%的变异性可由离心总功解释。对于VO₂ ml·kg⁻¹·min⁻¹的相应R²值为0.50 - 0.58。向心相对耐力与最大血乳酸呈显著负相关（R² = 0.73）。本研究表明，等速膝关节伸展耐力测量的离心总功和向心相对耐力与跑步机跑步能力的测量显著相关，如次最大V0₂和最大血乳酸所表示。建议这些等速测量可用于评估男性精英中长跑运动员的特定跑步能力。
