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]

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
Masseter 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

*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).