|Author Year; Country|
Bosveld et al. 2015
|Population: 25 individuals; chronic SCI; age =49.7 ± 12.5 years; years post injury= >1y|
Treatment: Participants were randomized into two groups. Group 1 (n = 13) received whole-body vibration treatment (frequency: 50 Hz, amplitude: 2 mm) comprising of four 45-second bouts with 1-minute rest periods after each bout. Group 2 (n = 12) received sham electrical stimulation. Maximal voluntary isometric quadriceps force was measured with a fixed dynamometer. A modified Five-Time-Sit-To-Stand (FTSTS) test was used to assess functional lower extremity strength. Measures were made at pre-test, immediate post-test, and delayed post-test 20 minutes later.
Outcome Measures: Maximal voluntary isometric quadriceps force, modified Five-Time-Sit-To-Stand (FTSTS) test.
|1. When comparing the pre-test and immediate post-test data, the difference in mean quadriceps strength between the two groups approached significance (P = 0.10). However, between the pre-test and delayed post-test, there were no significant difference between groups (P = 0.82).|
2. The within-group change for the WBV group was significant with a moderate effect size (P = 0.05; ES = 0.60)
3. Between the pre-test and immediate post-test, the time from sit to stand between the two groups approached significance (P = 0.10). Between the pre-test and delayed post-test, there was no significant difference between groups (P = 0.32).
|Effect Sizes: Forest plot of standardized mean differences (SMD ± 95%C.I.) as calculated from pre- and post-intervention data|
Alizadeh-Meghrazi et al. 2015
|Population: 10 males; 6 healthy, 4 with chronic SCI; 1 AIS A and 3 AIS C; age= 28.83 ± 7.78y; years post injury > 1y|
Treatment: Testing was performed on 2 days, where the participants were randomly allocated to exposure to either the WAVE® or Juvent™ platform each day. All participants were provided with the same shoes to eliminate footwear variability. In the case of the WAVE® platform, all combinations of the following parameters were used: (1) vibration frequencies of 25, 35, and 45 Hz; (2) two vibration amplitude settings and (3) knee angles of 140°, 160°, and 180°. In the case of the Juvent™ platform, all combinations of the following parameters were used: (1) vibration frequencies of 25, 35, and 45 Hz; (2) constant power setting of 28; and (3) knee angles of 140°, 160°, and 180°.
Outcome Measures: EMG
|1. WBV can elicit EMG activity among participants with chronic SCI, if appropriate vibration parameters are employed.|
2. The participants’ knee angle had no significant impact on lower extremity EMG activity.
3. The vibration frequency had a significant impact on EMG activation in all lower extremity muscles except VL while the amplitude of vibration had a significant impact on EMG activation on the GM and RF muscles only.
|Ness & Field-Fote 2009|
|Population: 3 women, 14 men; aged 28-65 years; all participants had a motor-incomplete SCI; C3-T8 lesion level; ≥1 year duration.|
Treatment: WBV 3 days/week for 4 weeks with four 45 second bouts of 50 Hz frequency and 2-4mm intensity each session, while standing on a vibration platform and 1 minute seated rest in between.
Outcome Measures: 3-D motion capture system used to measure walking function (walking speed; step length; cadence (steps/min); hip-knee intralimb coordination).
|1. Walking speed significantly increased by mean (SD) 0.062 (0.011) m/s.|
2. Speed continued to improve 1 week post final intervention; only one participant tested.
3. Cadence, weak side step length, and strong side step length all significantly increased following 12 sessions of WBV.
4. Increased walking speed was significantly related to increased cadence.