Arm cooling selectively impacts sensorimotor control.

Area of Science:

• Neuroscience
• Human Movement Science
• Sports Medicine

Background:

• Cold exposure is recognized for its benefits in sports and medicine.
• However, the costs of cold, particularly on sensorimotor control, are less understood.
• Proprioceptive cue processing may be affected by cold, impacting motor control.

Purpose of the Study:

• To investigate how arm cooling affects sensorimotor representations and control.
• To test the hypothesis that cold slows proprioceptive processing, impacting feedback and feedforward control.
• To examine the effects of cold on action representations and motor imagery.

Main Methods:

• Experiment 1: Participants performed a Fitts's pointing task after arm immersion in cold (14°C) or lukewarm (34°C) water, with kinematic analysis.
• Experiment 2: Participants completed a hand laterality task (assessing mental hand representation) with a cooled or non-cooled hand, without physical movement.

Main Results:

• Cold exposure altered early kinematic parameters in pointing, suggesting impacts on feedforward control or hand representation.
• Cold exposure modified late kinematic parameters in pointing, indicating changes in proprioceptive feedback utilization.
• Performance on the hand laterality task was impaired with a cooled hand, particularly at extreme orientations, supporting altered action representations.

Conclusions:

• Arm cooling influences sensorimotor control by affecting both feedback and feedforward processes.
• Cold exposure appears to modify the internal representation of the body, specifically the hand.
• These findings highlight the complex effects of cold on the nervous system's control of movement and perception.