ECCENTRIC MODE
1. Eccentrics emphasize the elastic nature of muscle and therefore a
patient can work eccentrically at a greater physiological efficiency.
This translates to greater patient compliance in many cases since
the exercises are subjectively not as hard to perform.
2. There is evidence that eccentric contractions can result in similar
strength gains as concentric contractions. In early stages of rehab
this may be attractive to the clinician and patient.
3. Mark Rowinski, PhD, PT, (Biodex Clinical Protocol Manual, 1988)
states:
"The therapist must focus on the motor control mechanism, and since
bending is assisted by gravity, the eccentric activity of the trunk
extensors should be the prime focus early in the rehabilitation process.
Therapy should progress slowly from eccentrics of the trunk extensors
to concentrics of the flexors and, finally, to concentrics of the trunk
extensors.
This progression makes sense in relation to the sensitivity of the struc-
tures involved and the capabilities of the muscles, since the extensors
are about two to three times stronger than the trunk flexors."
ISOMETRIC MODE
1. Since no movement is involved, patients can safely exercise muscle
flexors or extensors at specific angles while placing only minimal
stress on the trunk and back.
2. In the acute stages of rehab, submaximal exercise can be utilized to
maintain or increase strength at specific ranges in the ROM.
8. MAINTENANCE
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CLINICAL APPLICATIONS