Characteristics of Paraspinal Muscle Spindle Response to
Mechanically-Assisted Spinal Manipulation-A Preliminary Report

William R Reed; Joel G Pickar; Randall S Sozio; Michael A.K. Liebschner; Joshua W. Little; Maruti R Gudavalli

doi:10.1016/j.jmpt.2017.03.006

Table 2

Time Required to Return to 95% of Baseline MF & MIF After Activator V™ MAM
Time required to return to 95% of baseline mean frequency (MF) and mean instantaneous frequency (MIF) discharge for a minimum of 1s following Activator V mechanical-assisted manipulation (MAM). Different subpopulations of spindle afferents appear to exist according to the time required to return to MF/MIF baseline. The reported values are the percentage of afferents returning to MF/MIF baseline discharge for the respective time period.

Mean Frequency (MF) Mean Instantaneous Frequency (MIF)
Force

Time (s) Setting 1
(n=9) Setting 2
(n=12) Setting 3
(n=8) Setting 1
(n=9) Setting 2
(n=12) Setting 3
(n=8)
0 – 1.99 45% 33% 25% 89% 67% 75%
2 – 3.99 33% 8% 0% 11% 8% 0%
4 – 5.99 11% 8% 12% 0% 25% 0%
6 – 7.99 11% 0% 25% 0% 0% 25%
8 – 10 0% 8% 0% 0% 0% 0%
>10 0% 43% 38% 0% 0% 0%

	Mean Frequency (MF)			Mean Instantaneous Frequency (MIF)
Force Time (s)	Setting 1 (n=9)	Setting 2 (n=12)	Setting 3 (n=8)	Setting 1 (n=9)	Setting 2 (n=12)	Setting 3 (n=8)
0 – 1.99	45%	33%	25%	89%	67%	75%
2 – 3.99	33%	8%	0%	11%	8%	0%
4 – 5.99	11%	8%	12%	0%	25%	0%
6 – 7.99	11%	0%	25%	0%	0%	25%
8 – 10	0%	8%	0%	0%	0%	0%
>10	0%	43%	38%	0%	0%	0%