Table 1.

Analysis of hyoglossus motor unit firing rates under low-force and high-force conditions

	Low Force	High Force	P Value
Peak retraction force, g	0.5 ± 0.4 (0.1–1.7)	1.4 ± 1 (0.3–3.8)	<0.0001
Force at spike onset, g	0.2 ± 0.2 (0.0–0.8)	0.3 ± 0.2 (0.0–0.8)	0.42
Mean frequency, Hz	41.4 ± 13.3 (20.4–86.1)	59.1 ± 22.7 (20.4–112.3)	<0.0001
Peak frequency, Hz	55.7 ± 23.4 (22.2–127.9)	112.9 ± 85.9 (22.9–369.0)	0.0002
N/cycle	4.9 ± 3.8 (1–14)	11.1 ± 6.2 (2–22)	<0.0001
Spike train duration, s	0.11 ± 0.07 (0.03–0.28)	0.18 ± 0.07 (0.05–0.4)	0.0001
CV of ISI	0.23 ± 0.06 (0.12–0.33)	0.24 ± 0.08 (0.14–0.46)	0.16

Values are means ± SD (range). N/cycle, number of spikes per respiratory cycle; CV, coefficient of variation; ISI, interspike interval. P values were derived from paired, two-tailed t-tests comparing low and high force for each variable.