Effect of Acupuncture on Muscle Endurance in the Female Shoulder Joint: A Pilot Study.

Shoulder problems are a major cause of reduced athletic performance, particularly in female athletes. Researchers investigated whether acupuncture could improve shoulder muscle endurance and help prevent injuries. This pilot study involved 20 women with healthy shoulder joints who performed isokinetic exercises (controlled speed movements) to test their shoulder strength and endurance. The researchers used acupuncture needles at 11 specific points around the shoulder, including points on the Lung, Large Intestine, Triple Energizer, and Kidney meridians. After receiving acupuncture treatment, participants showed significant improvements in several measures of shoulder performance. Their maximum torque (rotational force) increased for flexion, extension, and adduction movements. They also demonstrated increased average work, average power, and total work output across multiple shoulder movements in both front-to-back and side-to-side planes. The only movement that didn't show significant improvement was abduction (lifting the arm away from the body), which researchers believe may be due to competing forces from opposing muscle groups. The study suggests that acupuncture at shoulder points can increase muscle excitability, which helps delay fatigue and improve overall muscle endurance. This could potentially benefit athletes and active individuals looking to enhance shoulder performance and reduce injury risk. If you're interested in acupuncture for shoulder strength or athletic performance, seek treatment from a licensed acupuncturist trained in sports medicine applications.

This pilot study evaluated acupuncture's effect on shoulder muscle endurance in 20 female participants with full range of motion during isokinetic testing. Eleven acupoints were needled: LI14, LI15, SJ14, SJ13, KI26, LU1, LU2, LU4, LU5, LU3, and SJ12. Post-acupuncture measurements showed statistically significant increases (P < 0.05) in average maximum torque for flexion, extension, and adduction; average work and power for flexion/extension and adduction/abduction; total work for both planes; and total net sagittal and frontal plane work. Average maximum abduction torque did not reach significance, potentially due to antagonistic muscle forces. The mechanism is theorized to involve nerve stimulation inducing postactivation potentiation (PAP) in motor units. Clinical implications suggest acupuncture at periarticular shoulder points may enhance muscle excitability, delay fatigue onset, and improve endurance in athletic populations. Further research with larger sample sizes and control groups is warranted to confirm these preliminary findings.