Responses to rapid impulsive perturbations during running
| . | All trials (N=11) . | Perturbation occurs during stance phase of tripod LF,RM,LR (N=6) . | Perturbation occurs during stance phase of tripod RF,LM,RR (N=5) . |
|---|---|---|---|
| Phase of perturbation in stride (%) | 37±28 | 35±26 | 40±32 |
| Maximum lateral velocity (cm s-1) | 21.0±6.9 | 20.5±7.3 | 21.5±7.1 |
| Time to lateral velocity decrease(ms)* | 13±5 | 12±6 | 13±4 |
| Minimum yaw velocity (degrees s-1) | -451±283 | -438±293 | -465±315 |
| Time to yaw velocity decrease (ms) | 14±9 | 12±6 | 16±12 |
| Minimum pitch velocity (degrees s-1) | -498±364 | -530±338 | -467±435 |
| Time to pitch velocity decrease (ms) | 10±12 | 6±1 | 14±16 |
| Minimum roll velocity (degrees s-1) | -596±837 | -806±911 | -336±746 |
| Time to roll velocity decrease (ms) | 14±26 | 21±35 | 6±1 |
| . | All trials (N=11) . | Perturbation occurs during stance phase of tripod LF,RM,LR (N=6) . | Perturbation occurs during stance phase of tripod RF,LM,RR (N=5) . |
|---|---|---|---|
| Phase of perturbation in stride (%) | 37±28 | 35±26 | 40±32 |
| Maximum lateral velocity (cm s-1) | 21.0±6.9 | 20.5±7.3 | 21.5±7.1 |
| Time to lateral velocity decrease(ms)* | 13±5 | 12±6 | 13±4 |
| Minimum yaw velocity (degrees s-1) | -451±283 | -438±293 | -465±315 |
| Time to yaw velocity decrease (ms) | 14±9 | 12±6 | 16±12 |
| Minimum pitch velocity (degrees s-1) | -498±364 | -530±338 | -467±435 |
| Time to pitch velocity decrease (ms) | 10±12 | 6±1 | 14±16 |
| Minimum roll velocity (degrees s-1) | -596±837 | -806±911 | -336±746 |
| Time to roll velocity decrease (ms) | 14±26 | 21±35 | 6±1 |
Values are means ± S.D.
Reported velocities are increases or decreases in velocity relative to scaled mean reference velocities from unperturbed trials.
LF, left front leg; RM, right middle leg; LR, left hind leg; RF, right front leg; LM, left middle leg; RR, right hind leg.
Indicates the time from the beginning of the perturbation until the magnitude of relative velocity begins to decrease from its maximal value.