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6. SELECTING THE RESISTANCE MODE
The Biodex SRC provides two modes of operation: Constant Power Effort Control and Isokinetic
Speed Control. Either mode is selected using the <Select Exercise> (4) key. Standard SRC's
default to Constant Power Effort Control while SRC Clinical Pro's with optional retro-cycling
default to Isokinetic Speed Control. Pressing the <Select Exercise> key will let you toggle
between the two choices. An LED illuminates next to the current selection. The Constant Power
Effort Level or Isokinetic Speed selected are displayed in the exercise window at the bottom of
the display. Effort level and WATTS are also displayed in the effort level display bar.
NOTE: Although the effort level display bar shows up to 300 watts, the LED display will show up to
600 watts.
NOTE: Work rates of 30 to 600 watts can be achieved without using the AC adapter when above 30
watts and 50 RPM. Using the AC adapter will allow users to achieve work rates as low as 10 watts at
25 rpm.
CONSTANT POWER EFFORT CONTROL (AEROBIC EXERCISE)
• Resistance automatically changes as pedal speed changes to maintain intended effort level
• Excellent for heart rate and pulmonary rehab where work rate compliance is priority
• Popular for general aerobic conditioning
Constant Power Effort Control is ideal for cardiovascular and general aerobic exercise. In this
mode, subjects can pedal as fast or as slow as they wish. The catch is that the slower one pedals,
the greater the resistance encountered. That's because Constant Power Effort Control provides
for a preset, fixed power (PWR) output with variable speed and variable resistance.
Using Constant Power Effort Control, no matter how fast or slow the subject pedals the same
amount of work must be produced. To ensure this, the SRC instantaneously varies pedaling
resistance to match the effort of the user as measured in pedal revolutions per minute. Increase
the pedal RPM's and the SRC responds by decreasing resistance. Decrease RPM's and increased
pedaling resistance will be the result. In short, work rate remains constant regardless of pedal
RPM speed.
When Constant Power Effort Control is selected, effort level is displayed in the Effort Level
Display Window and Effort Level Display Bar. A selection of 15 effort levels provides a wide
range of work-rate choices. Weak, de-conditioned, or post-operative patients, for example, can
exercise at work rates as low as 10 watts. Stronger subjects can demand as much as 300 watts.
Because a known work rate can be set, Constant Power Effort Control is extremely valuable in
the later stages of orthopedic rehabilitation and for performance training.
ISOKINETIC SPEED CONTROL (STRENGTH EXERCISE)
• Speed is always constant and resistance is accommodating
• Pedal hard, work rate increases. Pedal easy, work rate decreases
• Excellent for strengthening and building endurance
• Popular for sport training
SELECTING THE RESISTANCE MODE
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