Acute muscle stretching and shoulder position sense

Area of Science:

• Sports Medicine
• Biomechanics
• Human Physiology

Background:

• Stretching is widely used by athletes for injury prevention.
• Potential mechanisms involve changes in muscle spindle properties, possibly affecting proprioception.
• The association between acute stretching and proprioception, particularly in the shoulder, remains unclear.

Purpose of the Study:

• To investigate the impact of acute stretching of shoulder muscles on joint position sense.
• To determine if stretching shoulder agonists or antagonists alters proprioceptive acuity.

Main Methods:

• A randomized crossover design involving 18 healthy volunteers (9 male, 9 female).
• Participants underwent three conditions: stretching of shoulder agonists, stretching of shoulder antagonists, or a nonstretching control.
• Shoulder position sense was assessed by measuring the ability to reproduce specific arm positions before and after each intervention, analyzing variable and absolute error.

Main Results:

• No significant differences in variable error (response variability) were observed between stretching interventions and the control group.
• No significant changes in absolute error (overall accuracy) were detected across the different intervention conditions.
• Neither the test sequence nor the interaction between intervention and sequence affected the results for either error measure.

Conclusions:

• Acute stretching of either shoulder agonist or antagonist muscles does not appear to influence shoulder position sense.
• These findings suggest that proprioceptive acuity is not compromised immediately following a bout of shoulder stretching.