Interlimb coordination during locomotion: what can be adapted and stored?

Area of Science:

• Neuroscience
• Biomechanics
• Locomotion studies

Background:

• Interlimb coordination is essential for bipedal locomotion and environmental adaptation.
• Split-belt treadmills reveal how humans adjust walking patterns when legs move at different speeds.
• Previous studies show basic gait alterations but not the adaptation of all gait parameters or pattern storage.

Purpose of the Study:

• To investigate if adults adapt both intra- and interlimb gait parameters during split-belt walking.
• To determine if training on a split-belt treadmill leads to observable aftereffects.
• To explore the neural control mechanisms underlying gait adaptation.

Main Methods:

• Healthy subjects walked on a split-belt treadmill under three conditions: tied belts (baseline), split belts (adaptation), and tied belts again (postadaptation).
• Gait parameters, including those related to interlimb coordination and individual limb function, were measured.
• Subjective perceptions of walking (e.g., limping) were also recorded.

Main Results:

• Interlimb gait parameters adapted slowly during split-belt walking and exhibited significant aftereffects post-training.
• Individual limb gait parameters adjusted rapidly to split belts but showed no aftereffects.
• Changes in interlimb parameters correlated with subjective experiences of limping.

Conclusions:

• The nervous system demonstrates some independence in controlling intra-limb versus inter-limb parameters during walking.
• Adults can adapt and store new interlimb coordination patterns after brief training periods.
• Differences in adaptation rates suggest varying complexities and neural control levels for different gait parameters.