Walking combined with reach-to-grasp while crossing obstacles at different distances

Area of Science:

• Biomechanics
• Motor Control
• Human Movement Science

Background:

• Real-world tasks like walking and grasping are common.
• The impact of increased walking difficulty on combined walking and grasping is not well understood.

Purpose of the Study:

• To investigate how walking and reach-to-grasp movements change when performed together with varying obstacle difficulty.
• To determine the effect of obstacle location relative to the grasping object on motor skill execution.

Main Methods:

• Fifteen young adults performed walking and grasping tasks with an obstacle placed at different positions (N-1, N, N+1) relative to the grasp object.
• Kinematic data were collected to analyze changes in gait parameters and reach-to-grasp movements.

Main Results:

• Grasping did not affect leading limb obstacle negotiation.
• Trailing limb toe clearance decreased when the obstacle was closer to the grasp point (N+1 vs. N-1).
• Step width increased with the obstacle-crossing task; grasping timing was affected by obstacle proximity.

Conclusions:

• Combining grasping with obstacle crossing affects trailing limb control, potentially due to impaired visual information processing for limb elevation.
• Prospective control is impacted, indicating a trade-off in attention between grasping and obstacle negotiation.