A controlled study on the effects of hyperthermia at 434 MHz and conventional ultrasound upon muscle injuries in sport

J Sports Med Phys Fitness. 2001 Dec;41(4):521-7.


Background: Hyperthermia equipment using a 434 MHz applicator with water bolus elevate to therapeutic temperatures (from 41 to 45 degrees C) delineated volumes of tissue target, down to a depth of 3 to 5 cm. The aim of our study was to evaluate the efficacy of hyperthermia in the treatment of muscle injuries, in comparison with a conventional modality like ultrasound.

Methods: A prospective randomised controlled design was used. Forty patients, 29 males and 11 females, with mean age of 26.2+/-3 ranging between 18 and 35 years affected by acute muscular injuries of different sites and severity participated this study. Twenty-one patients received hyperthermia (group A) and the remaining 19 (group B) ultrasound. Both groups received nine applications, three times per week with a duration of 30' for the group (A), and 15' for the group (B). All the patients underwent a clinical examination including a pain measurement and a ultrasound scanning before, at the end and after one month follow-up. An additional ultrasonography was made after the fourth session to compare the effect of each treatment on the initial course of haematoma resolution.

Results: Both groups had a significant decrease of the pain (p< 0.001). The hyperthermia group showed a significantly higher effect on VAS score and on haematoma resolution after two weeks of treatment.

Conclusions: Even with a limited number of cases our results show that the hyperthermia is a highly innovative, safe and reliable modality for the treatment of acute sport muscle injuries.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Adolescent
  • Adult
  • Athletic Injuries / diagnostic imaging
  • Athletic Injuries / therapy*
  • Female
  • Humans
  • Hyperthermia, Induced / instrumentation
  • Hyperthermia, Induced / methods*
  • Male
  • Muscle, Skeletal / diagnostic imaging
  • Muscle, Skeletal / injuries*
  • Pain Measurement
  • Prospective Studies
  • Ultrasonic Therapy / methods*
  • Ultrasonography