Effects of two different stretching techniques on proprioception and hamstring flexibility: a pilot study.

Area of Science:

• Sports Medicine
• Rehabilitation Science
• Biomechanics

Background:

• Hamstring shortness is common and can affect flexibility and proprioception.
• Static stretching is a widely used method to improve flexibility.
• Proprioceptive neuromuscular facilitation (PNF) techniques, like CRAC, may offer alternative benefits.

Purpose of the Study:

• To compare the immediate and long-term effects of PNF CRAC exercises versus static stretching.
• To evaluate the impact on hamstring flexibility and proprioception in males with hamstring shortness.

Main Methods:

• Participants: Males with hamstring shortness.
• Intervention: 8-week program of PNF CRAC or static stretching (3 days/week).
• Measurements: Knee extension angle for flexibility, isokinetic dynamometer for proprioception (position and motion sense) at baseline, immediately post-exercise, and after 8 weeks.

Main Results:

• Both PNF CRAC and static stretching significantly improved flexibility and position sense immediately and long-term.
• Motion sense showed significant improvement in the long term specifically within the PNF CRAC group (p=0.02).
• No significant differences were found between the two methods for flexibility and position sense in either the immediate or long-term assessments (p>0.05).

Conclusions:

• Both PNF CRAC and static stretching are effective for enhancing hamstring flexibility.
• PNF CRAC demonstrates a superior long-term benefit for improving motion sense compared to static stretching.
• The findings suggest PNF CRAC may be a more advantageous technique for improving dynamic proprioception in individuals with hamstring shortness.