Welcome back to the Recovery Lab for another installment of Session Sit In! So excited to share this video today! In this episode, I have a very special Tartu Descartes'i Kool. kool@tdk.ee +372 746 1800. More Manuals for TDK TDKperformance TW453: 1. TDK tac4221 Operation & user's manual. tdk-tac4221-operation-user-s-manual-6.pdf, 6. Manual muscle testing is used in rehabilitation and recovery to evaluate contractile units, including muscles and tendons, and their ability to generate forces. When used as part of rehabilitation, muscle testing is an important evaluative tool to assess impairments and deficits in muscle performance