DEVELOPMENT OF JOINT EFFUSION, HYPERPERFUSION AND ENTHESITIS AFTER ONE HOUR OF AGE-AND GENDER ADJUSTED WEIGHT TRAINING
Authors: Julia Schreiner et al.
This study evaluated the development of joint effusion, hyperperfusion and enthesitis in large and medium joints of young healthy individuals after one hour of supervised weight training. 51 healthy individuals with a mean age of 23.7 years were included in the study. Ultrasound of the shoulder, elbow, wrist, hip, knee, ankle joints, and the entheseal sites of the Achilles tendon and the plantar aponeurosis was carried out before, 24h and 48h after the participants conducted one hour of supervised weight training.
The percentage of individuals with joint effusion in at least one joint increased from 72.55% (n=37) at baseline to 88.24% (n=45) after 24h and to 94.12% (n=48) 48h after the training. The mean number of joints affected by effusion were 1.49 at baseline, 2.82 after 24h and 4.16 after 48h. Fourteen participants (27.45%) presented with entheseal pathology in at least one enthesis at baseline, 47.06% (n=24) showed pathologies after 24h and 56.86% (n=29) after 48h.
Prevalence of joint effusion in large and medium joints as well as the prevalence of entheseal pathology increases significantly within 48h after weight training. Small joint effusion detected by ultrasound do exist in 73 % even before exercise. These results confirm older studies who detected structural and vascular changes in tendons and entheses as well as joint effusion in athletes and physically active individuals. This evidence may raise the question, whether a patient’s ultrasound findings are related to a rheumatic disease or associated with physical activities. Therefore, the patient’s sports or physical activities should be considered when performing a musculoskeletal ultrasound examination.