Acute effects of supraspinatus-specific isoinertial training on tendon thickness in young active subjects. A pilot study.

Abstract Isoinertial training is a new form of physical exercise that combines concentric-eccentric exercises while regulating the load. Objectives The aim of the study was to analyze acute changes in the cross-sectional area (CSA) of the supraspinatus tendon after isoinertial 10 sets of yellow inertial disc exercises using 0.052Kgm 2 of inertia and a maximum resistance of 18 kg with Handy Gym™ device. Participants Seventy-two healthy athletic subjects (40 men and 32 women) were analyzed. Results The results showed there was a time effect for tendon thickness and volume (p < 0.01) with a reduction of about 5% and 8.3% respectively. Likewise, no significant correlation (p = 0.63) was observed between the load (kg) used by the subject and the changes in the supraspinatus tendon after detailed statistical discrimination in 4 quartiles with loads from 0 to 11.5 kg. Conclusion The isoinertial stimulus/load produced an acute significant decrease in the supraspinatus tendon thickness (CSA) after the isoinertial training proposed in the study.