Mechanisms of failed recovery following postural perturbations on a motorized treadmill mimic those associated with an actual forward trip
Mechanisms of failed recovery following postural perturbations on a motorized treadmill mimic those associated with an actual forward trip
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DOI：
10.1016/s0268-0033(01)00077-8
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发表时间：
2001-11-01
影响因子：
1.8
通讯作者：
Grabiner, MD
中科院分区：
文献类型：
--
作者：
Owings, TM;Pavol, MJ;Grabiner, MD
Objective.为了检查在跑步机加速任务期间采用的恢复策略，以确定在电动跑步机上导致失败恢复的机制是否与导致旅行福尔斯的一般生物力学机制相同，并确定是否可以修改失败的恢复响应以允许在后续试验中成功恢复。设计，使用电动跑步机诱导健康老年人的姿势扰动。以前，我们诱导老年人的旅行，以确定失败的恢复机制。然而，诱导绊倒并不是一个临床实用的测试，用于确定老年人谁是倾向于下降。安全套老年人站在跑步机上，从0到0.89英里加速施加姿势扰动。恢复被分类为成功（n = 42）或失败（n = 23）。采用运动分析方法计算选定的生物力学变量。最初失败的恢复有较慢的反应时间，较短的步长，更大的躯干屈曲角度和速度。初次尝试失败的受试者修改了他们的恢复策略，以成功恢复。这些恢复的生物力学类似于那些成功恢复的受试者。结论。与失败的跑步机恢复相关的生物力学机制模拟了那些导致诱导旅行失败的恢复机制。初始恢复应答失败的受试者进行了修改，允许在后续尝试中成功恢复。
Objective. To examine the recovery strategies employed during a treadmill acceleration task, to determine if mechanisms that contributed to failed recoveries on a motorized treadmill are the same general biomechanical mechanisms that contributed to falls from a trip, and to determine if failed recovery responses could be modified to allow for successful recoveries on subsequent trials.Design, A motorized treadmill was used to induce postural perturbations in healthy older adults.Background. Previously, we induced trips in older adults to identify the mechanisms of failed recovery. However, inducing trips is not a clinically practical test for identifying older adults who are predisposed to falling.Methods. Safety-harnessed older adults stood on a treadmill that was accelerated from 0 to 0.89 mls to impose a postural perturbation. Recoveries were classified as successful (n = 42) or failed (n = 23). Selected biomechanical variables were calculated using motion analysis methods.Results. Initial failed recoveries had slower reaction times, shorter step lengths, and greater trunk flexion angles and velocities. Subjects who failed on the initial attempt modified their recovery strategy to successfully recover. The biomechanics of these recoveries resembled those used by subjects who successfully recovered on their initial attempt.Conclusions. The biomechanical mechanisms involved with a failed treadmill recovery mimic those responsible for failed recoveries from an induced trip. Subjects who failed on their initial recovery response made modifications allowing successful recoveries on subsequent attempts.