Skip to main content

Advertisement

Table 4 Posturographic results: torque variance values [Nm/(kg*m)]2, n = 7

From: The effects of high frequency subthalamic stimulation on balance performance and fear of falling in patients with Parkinson's disease

  Eyes Open   Eyes Closed  
Sagittal sway DBS OFF DBS ON p-value DBS OFF DBS ON p-value
Quiet stance 0.73 0.54–0.80 0.74 0.28–0.87 > 0.3 0.68 0.56–1.5 1.0 0.45–1.1 > 0.3
Period 1 5.9 2.8–9.1 3.8 1.9–7.3 0.219 8.6 6.8–10.9 12.0 5.5–13.0 > 0.3
Period 2 3.5 2.6–4.4 3.5 2.5–4.4 > 0.3 6.7 5.3–8.6 6.7 4.9–11.3 > 0.3
Period 3 3.3 2.7–5.8 4.5 3.2–6.4 > 0.3 10.9 6.3–12.5 8.8 6.5–13.7 > 0.3
Period 4 2.7 2.4–4.3 3.4 2.9–6.2 > 0.3 6.8 4.9–8.9 7.1 4.0–9.1 > 0.3
Lateral sway DBS OFF DBS ON p-value DBS OFF DBS ON p-value
Quiet stance 0.10 0.09–1.0 0.17 0.04–0.44 > 0.3 0.36 0.12–0.72 0.20 0.07–0.39 0.109
Period 1 1.1 0.64–5.2 0.66 0.48–1.4 0.156 1.1 0.87–2.7 1.1 0.65–1.5 > 0.3
Period 2 0.46 0.43–1.2 0.70 0.30–0.86 > 0.3 1.2 0.54–1.5 0.76 0.67–1.1 > 0.3
Period 3 0.64 0.26–0.96 0.52 0.26–0.75 > 0.3 0.99 0.57–1.6 0.93 0.77–1.2 > 0.3
Period 4 0.49 0.30–0.76 0.70 0.25–0.94 > 0.3 1.2 0.37–2.2 0.73 0.63–1.2 > 0.3
  1. Torque variance values [Nm/(Kg*m)]2 are given as medians and first and third quartiles. Results are rounded as one decimal or two meaningful digits (maximum of two decimals are given).
  2. Parkinson's disease: PD.
  3. P values: Deep Brain Stimulation (DBS) ON as compared with DBS turned off (DBS OFF) when tested without anti-PD medication (withdrawal of all anti-PD drugs for 10–12 hours).
  4. Three patients were unable to perform the posturography unaided with DBS OFF and were therefore excluded from the statistical evaluation and result presentation.
  5. Quiet stance: Spontaneous sway was recorded for 30 seconds.
  6. Period 1–4: Vibratory stimulation on the calf muscles. Each period lasted for 50 seconds.
  7. The vibratory stimulation increased the anteroposterior and lateral torque variance values significantly (p ≤ 0.047) from quiet stance to period 1 in all test conditions (DBS OFF and ON, eyes open and closed).