Effect of the push-up plus guide and resistance device (PPGRD) on the serratus anterior during push-up plus

[Purpose] This study developed a push-up plus guide and resistance device and investigated the effectiveness of the device. [Subject and Methods] A 39-year-old man presented with moderate pain with left scapular dyskinesis. A newly designed assistance device was used as a push-up plus guide and resistance device (PPGRD). The subject performed the push-up plus exercise without and then with the PPGRD for 2 weeks each. [Results] After performing the push-up plus exercise with the PPGRD for 2 weeks, the serratus anterior muscle power was increased, the pain score was decreased, and the absence of scapular dyskinesis was confirmed. [Conclusion] The PPGRD provided appropriate guidance and prevented excessive trunk flexion during the push-up plus exercise.