The fastest runner on artificial legs: different limbs, similar function?
The fastest runner on artificial legs: different limbs, similar function?
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DOI：
10.1152/japplphysiol.00174.2009
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发表时间：
2009-09-01
影响因子：
3.3
通讯作者：
Herr, Hugh
中科院分区：
文献类型：
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作者：
Weyand, Peter G.;Bundle, Matthew W.;Herr, Hugh
Weyand PG, Bundle MW, McGowan CP, Grabowski A, Brown MB, Kram R, Herr H.假肢上跑得最快的人：不同的肢体，相似的功能？中国生物医学工程学报（英文版），2009；首次发表于2009年6月18日；doi: 10.1152 / japplphysiol.00174.2009。最近，一名双侧、跨胫截肢的短跑运动员使用现代跑步假体比赛取得了成功，这引发了一场关于他的假肢提供的相对功能的国际争议。在这里，我们对这名截肢短跑运动员和四肢完好的竞技男性短跑运动员之间的功能相似性进行了三项测试：跑步的代谢成本、短跑耐力和跑步力学。代谢和力学数据分别通过间接量热法和地面反作用力测量在等速水平跑步机上获得。首先，我们发现我们的截肢短跑受试者的平均总代谢成本为174.9 ml o . 2 kg(-1).km(-1)；速度：2.5-4.1 m/s)仅比四肢完好的优秀长跑运动员的平均值低3.8%，比亚健康长跑运动员低6.7%，但比四肢完好的400米专家低17% [210.6 (SD 13.2) ml o .2 kg(-1).km(-1)]。其次，我们的截肢短跑运动员在六次全速恒速试验中保持的速度（速度：6.6-10.8 m/s；持续时间：2-90 s）与正常四肢短跑运动员的预测速度相比在2.2 % （SD 0.6）以内。第三，在短跑速度为8.0、9.0和10.0 m/s时，截肢者的脚地接触时间更长[+14.7 (SD 4.2)%]，腾空时间更短[-26.4 (SD 9.9)%]，摆动时间更短[-15.2 (SD 6.9)%]，站立平均垂直力[-19.3 (SD 3.1)%]低于四肢健全的短跑运动员[最高速度= 10.8 vs. 10.8 (SD 0.6) m/s]。我们得出的结论是，使用现代下肢短跑假肢跑步与使用完整肢体跑步在生理上相似，但在机械上不同。
Weyand PG, Bundle MW, McGowan CP, Grabowski A, Brown MB, Kram R, Herr H. The fastest runner on artificial legs: different limbs, similar function? J Appl Physiol 107: 903-911, 2009. First published June 18, 2009; doi:10.1152/japplphysiol.00174.2009.-The recent competitive successes of a bilateral, transtibial amputee sprint runner who races with modern running prostheses has triggered an international controversy regarding the relative function provided by his artificial limbs. Here, we conducted three tests of functional similarity between this amputee sprinter and competitive male runners with intact limbs: the metabolic cost of running, sprinting endurance, and running mechanics. Metabolic and mechanical data, respectively, were acquired via indirect calorimetry and ground reaction force measurements during constant-speed, level treadmill running. First, we found that the mean gross metabolic cost of transport of our amputee sprint subject (174.9 ml O-2.kg(-1).km(-1); speeds: 2.5-4.1 m/s) was only 3.8% lower than mean values for intact-limb elite distance runners and 6.7% lower than for subelite distance runners but 17% lower than for intact-limb 400-m specialists [210.6 (SD 13.2) ml O-2.kg(-1).km(-1)]. Second, the speeds that our amputee sprinter maintained for six all-out, constant-speed trials to failure (speeds: 6.6-10.8 m/s; durations: 2-90 s) were within 2.2 (SD 0.6)% of those predicted for intact-limb sprinters. Third, at sprinting speeds of 8.0, 9.0, and 10.0 m/s, our amputee subject had longer foot-ground contact times [+14.7 (SD 4.2)%], shorter aerial [-26.4 (SD 9.9)%] and swing times [-15.2 (SD 6.9)%], and lower stance-averaged vertical forces [-19.3 (SD 3.1)%] than intact-limb sprinters [top speeds = 10.8 vs. 10.8 (SD 0.6) m/s]. We conclude that running on modern, lower-limb sprinting prostheses appears to be physiologically similar but mechanically different from running with intact limbs.