10
Section 3: Strain Parameters (Stretch)
RIGHT Digit: Strain Ratio
Digit
Degree of stretch
Distance
0
2%
0.4 mm
1
4%
0.8 mm
2
5%
1.0 mm
3
8%
1.6 mm
4
10%
2.0 mm
5
12%
2.4 mm
6
15%
3.0 mm
7
20%
4.0 mm
LEFT Digit: Strain Frequency Selector
Digit
Program
Description*
0
60 cycles/minute
Sine wave
Stretch 0.5 sec – contract 0.5 sec - repeat
1
30 cycles/minute
Sine wave
Stretch 1 sec – contract 1 sec - repeat
2
15 cycles/minute
Sine wave
Stretch 2 sec – contract 2 sec - repeat
3
10 cycles/minute
Sine wave
Stretch 3 sec – contract 3 sec - repeat
4
20 cycles/minute
Square wave
Hold 0.5 sec – stretch 1 sec – hold 0.5 sec – contract 1 sec - repeat
5
10 cycles/minute
Square wave
Hold 2 sec – stretch 1 sec – hold 2 sec – contract 1 sec - repeat
6
1 cycle/minute
Square wave
Hold 29 sec – stretch 1 sec – hold 29 sec – contract 1 sec - repeat
7
Static
Stretch 1 sec – hold indefinitely
*sec is the abbreviation for seconds
Customized for SDSU Bioengineering Lab
Left Digit: Strain Frequency Selector
Right Digit: Strain Ratio
Digit Degree of Stretch
Distance
Custom
Pattern
0 60 cycles/min
Sine Wave
Stretch 0.5 sec - contract 0.5 sec - repeat
0
2%
0.4 mm
1 30 cycles/min
Sine Wave
Stretch 1 sec - contract 1 sec - repeat
1
5%
1.0 mm
2 90 cycles/min
Sine Wave
Stretch 0.33 sec - contract 0.33 sec - repeat
2
10%
2.0 mm
3 60 cycles/min
Sine Wave
Stretch 0.67 sec - contract 0.33 sec - repeat
3
15%
3.0 mm
4 60 cycles/min
Sine Wave
Stretch 0.75 sec - contract 0.25 sec - repeat
4
20%
4.0 mm
5 60 cycles/min
Sine Wave
Stretch 0.85 sec - contract 0.15 sec - repeat
5 10-20% 2.0 to 4.0 mm
10-20%
6
1 cycle/min
Square Wave
Hold 29 sec - stretch 1 sec - hold 29 sec -
contract 1 sec - repeat
6 10-15% 2.0 to 3.0 mm
10-15%
7
N/A
Static
Stretch 1 sec - hold indefinetly
7
5-15%
1.0 to 3.0 mm
5-15%
