Introduction
Methods
Step 1: identifying the research question
Step 2: identifying relevant studies
Step 3: study selection
Inclusion and exclusion criteria
Screening and agreement
Step 4: charting the data
Step 5: collating, summarizing and reporting the results
Results
Descriptive numerical analysis
Risk of bias assessment for randomized control trials
Thematical analysis of findings
Frequency studies
Dosage studies
Studies | Dosage parameters | Spine level | Sample size | Outcomes measures | Results |
---|---|---|---|---|---|
Thrust forces: 30 N, 150 N | L4 | N = 4 | PAIN PRESSURE THRESHOLD | ● NO DIFFERENCES | |
Thrust forces: 50, 200 N | L5 | N = 30 | ● NO DIFFERENCES | ||
Thrust durations: 1,5 Hz or sustained pressure | |||||
Thrust durations: 30s,60s | L3 | N = 19 | ● NO DIFFERENCES | ||
Thrust durations: 1 Hz, 2 Hz | L1 to L3 | N = 30 | ● NO DIFFERENCES | ||
Thrust forces: 30 N, 150 N | L1 to L3 | N = 4 | MUSCULAR RESPONSE AMPLITUDE | ● Data suggest higher responses with maximum thrust force setting | |
Thrust forces: 19,5 N,190 N | Bilateral PSIS, sacrum, S1 and L5, L4, L2, T12 and T8 | N = 40 | ● Increase after SM treatment | ||
● SMT showed a greater increasing than control group and sham treatment | |||||
Preload forces: 5 N,50 N, 95 N, 140 N | T6 to T8 | N = 23 | ● Decrease during preload | ||
● Increase during thrust | |||||
Combination of thrust forces / thrust durations: 57 ms/150 N, 80 ms/200 N, 102 ms,250 N, 125 ms/300 N | T6 to T8 | N = 25 | ● NO DIFFERENCES | ||
Thrust forces: 80,130,180, 255 N | T6,T8 | N = 26 | ● Increase in thrust phase and resolution phase | ||
Thrust forces: 75 N,125 N,175 N, 225 N | L3 | N = 51 | ● Increase with increasing thrust force | ||
Thrust forces: 30 N, 150 N | L1 to L3 | N = 4 | VERTEBRAL DISPLACEMENT | ● Data suggest an increase when greater force is applied | |
Thrust forces: 30 N, 88 N, 117 N, 150 N | L3 to S2 | N = 9 | ● Increase with increasing thrust force | ||
Thrust forces: 19,5 N,190 N | Bilateral PSIS, sacrum, S1 and L5, L4, L2, T12 and T8 | N = 40 | ●increase after any treatment | ||
●SMT showed a greater increasing than control group and sham treatment | |||||
Preload forces: 5 N,50 N, 95 N, 140 N | T6 to T8 | N = 23 | ●Linear decrease with force during thrust phase ● Increase in preload phase with increasing preload | ||
Combination of thrust forces / thrust durations: 57 ms/150 N, 80 ms/200 N, 102 ms,250 N, 125 ms/300 N | T6 to T8 | N = 25 | ● Increase in thrust phase with increasing thrust force | ||
Thrust durations: 125 ms, 175 ms, 275 ms | T7,T8 | N = 20 | ● NO DIFFERENCES |
Studies | Dosage parameters | Sample size | Spine level | Muscle spindle activity - main results |
---|---|---|---|---|
[30] Cao et al., 2013 | Thrust forces: 25, 55, 85% of BW | n = 112 cats | L6 | ● Consistent increase in MIF for 1 mm thrust amplitude. |
Thrust displacements: 1, 2 or 3 mm | ●No specific trend associated to modulation in forces and displacements | |||
Thrust durations: 0,25,50,75,100,150,200, 250 ms | ||||
[35] Pickar et al., 2006 | Thrust forces: 33, 66, 100% of BW | n = 46 cats | L6 | ●Data suggest that decreasing thrust duration increases ΔMIF |
Thrust duration: 25, 50, 100, 200, 400 or 800 ms | ● There is a threshold effect for duration for which the discharge greatly increases | |||
[36] Pickar et al., 2007 | Thrust displacement: 1 or 2 mm | n = 54 cats | L6 | ● Data suggest that decreasing thrust duration increases ΔMIF |
Thrust duration: 12.5, 25, 50, 100, 200, 400 ms | ||||
● Peak thrust amplitude (1 mm compared to 2 mm) influence ΔMIF | ||||
[37] Reed et al., 2013 | Thrust forces: 25, 55, 85% of BW | n = 112 cats | L6 | ● Data suggest that decreasing thrust duration increases mean spindle discharge through range of forces. |
Thrust displacement: 1, 2 or 3 mm | ● Through a range of force durations, increasing force seems to increase ΔMIF. | |||
Thrust durations: 25, 50, 75, 100, 200, 250 ms | ● For most thrust duration, peak thrust displacement did not influence ΔMIF. | |||
● Increasing force rates increased MIF | ||||
[38] Reed et al., 2015 | Thrust force: ranges from 68 N to 122 N | n = 1 cat | L7 | ● Data suggest that increasing force leads to increase ΔMIF. |
[39] Reed et al., 2014 | Preload variation: 18% or 43% of thrust force | n = 20 cats | L6 | ● Increasing longer preload duration (4 s compared to 1 s) increases ΔMIF. |
Thrust durations: 1 or 4 s (Thrust force: 55% of BW) | ||||
● A smaller magnitude of preload (18% compared to 43%) increases ΔMIF | ||||
● The highest preload magnitude and longest duration led to a significantly greater mean decrease in resting spindle discharge | ||||
[40] Reed et al., 2017 | Thrust force: 22 N, 44 N or 67 N | n = 6 cats | L6 | ● Data suggest that increase in force increased the time required until the first action potential. |