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Table 2 Quick reference simplified set of normative data for electric activity obtained by surface EMG for the masseter, submental group (SUB) and laryngeal strap muscles (INF) during various tests, in μV. [age range: normal range of voltage values]

From: Standardization of surface electromyography utilized to evaluate patients with dysphagia

Saliva swallow    
Masseter range 18–30: 4.5 – 15.9 31–70: 5.54 – 12.1 70+: 2.94–22.42
SUB range 18–30: 13.4–59.72 31–70: 9.52 – 49.5 70+: 10.2–42.32
INF range 18–40: 2.0–4.5 41–70: 2.5–4.3 70+: 4.3–7.25
Normal swallow    
Masseter range 18–60: 2.2–31.0 61–70: 1.97 – 27.69 70+: 3.77–20.0
SUB range 18–30: 11.4–63.41 31–50: 12.58–51.6 51–70+: 7.4 – 44.8
INF range 18–40: 2.85–6.3 41–70: 3.8–5.6 70+: 4.33–8.0
Excessive swallow    
M asseter range 18–40:1.5–37.0 41–70: 1.2 – 29.4 70+: 4.65–21.13
SUB range 18–30: 19.28–50.80 31–70+: 12.1 – 47.44  
INF range 18–40: 3.8–6.55 41–70: 3.9–6.23 70+: 4.5–9.3
100 cc drinking    
Masseter mean (real)* 18–70: 0.8 – 6.2   70+: 1.0 – 7.84
SUB mean (real) 18–60: 3.5 – 11.5 61 – 70+: 4.25 – 16.25  
INF mean (real) 18–70: 1.4–2.8   70+: 1.0–3.85
  1. *Raw mean = computer-calculated mean, while Real mean = raw mean minus the mean resting potential of an actual muscle covered by skin (2.808 μV = for the m. submental and m. infrahyoid, 2.495 μV = for the m. masseter, and 4.542 = for the m. orbicularis oris).