Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
, 102 (2), 339-49

Strategies for Recovery From a Trip in Early and Late Swing During Human Walking


Strategies for Recovery From a Trip in Early and Late Swing During Human Walking

J J Eng et al. Exp Brain Res.


The movement strategies and the underlying organization of the muscular responses for recovery from a tripping perturbation applied in early and late swing during walking were studied in humans. The latencies of the reflex response (60-140 ms) suggested that polysynaptic pathways are involved. The most common movement outcome was an elevating strategy of the swing limb in response to the early swing perturbation and a lowering strategy in response to the late swing perturbation. The elevating strategy comprised a flexor component of the swing limb and an extensor component of the stance limb. There was a temporal sequencing of the swing limb biceps femoris prior to the swing limb rectus femoris response to remove the limb from the obstacle prior to accelerating the limb over the obstacle. The extensor response of the stance limb generated an early heel-off to increase the height of the body. Thus, the lower limb joints collaborated to increase the height of the centre of mass and provide extra time to extend the swing limb in preparation for the landing. Flexion of the swing limb would be dangerous in response to the late swing perturbation as the swing limb is approaching the ground and the body mass has passed forward of the stance foot. Instead, a lowering strategy was accomplished by inhibitory responses of the swing limb vastus lateralis and/or excitatory responses of the swing limb biceps femoris. Both these responses resulted in a rapid lowering of the limb to the ground with a flat foot or forefoot landing and a shortening of the step length. Thus, in response to the late swing perturbation, the same recovery strategy was achieved by different patterns of muscle activation. These results demonstrate that the recovery strategies provided a functionally appropriate response for overcoming the obstacle and maintaining the ongoing locomotion.

Similar articles

See all similar articles

Cited by 65 articles

See all "Cited by" articles


    1. Electroencephalogr Clin Neurophysiol. 1987 Mar;66(3):244-52 - PubMed
    1. Exp Brain Res. 1990;82(2):351-8 - PubMed
    1. Neurosci Lett. 1984 Aug 31;49(3):291-5 - PubMed
    1. J Neurophysiol. 1988 Jul;60(1):204-17 - PubMed
    1. J Neurol Neurosurg Psychiatry. 1988 Apr;51(4):568-71 - PubMed

Publication types