Music has always been a powerful tool for capturing and sustaining attention, but the reason why has been unclear. An analysis of musical information clarifies the use of tempo as a movement cue. The tool you need is a metronome, which can be downloaded to most smart phones.
To start, take your pulse and set the metronome to match your heart rate. Tap your hand on your knee in rhythm with the beat. Increase and decrease the speed and tap your hand at the various speeds so that you can experience what a change in tempo feels like to you.
Match the speed of the metronome to the heart rate of the person functioning within ACL 1.6. You can experiment with the speed to see what effects slower or faster speeds have. For many people, the matched speed or a slightly faster tempo helps sustain attention for impressive lengths of time. Increasing or maintaining muscle strength requires sustained attention. Within ACL 1.6, hand-over-hand assistance for tapping their hand may be necessary.
Both passive and active range of motion can be sustained longer with the metronome. Facial expressions and rhythmic movements express preferences. Exercises for trunk control while in fully supported seating may be more robust. While seated on the edge of the bed, swinging their feet with the beat of their heart rate may prolong the exercise.