Table 3.

Descriptive statistics, including mean and 2 SDs, were calculated of the 95% power frequency for both the ramp and the plateau subphases

Muscle	Electrode	Ramp					Plateau
		Mean (Hz)	2 SDs	UL	Nyquist rate	3× UL	Mean (Hz)	2 SDs	UL	Nyquist rate	3× UL
Anterior deltoid	Surface	229	100	330	659	989	210	77	287	574	860
Middle deltoid	Surface	243	165	408	816	1,224	240	132	372	743	1,115
Posterior deltoid	Surface	193	56	249	499	748	200	64	264	527	791
Pectoralis major	Surface	237	104	340	681	1,021	209	86	296	592	887
Upper trapezius	Surface	152	98	250	500	750	143	85	228	455	683
Middle trapezius	Surface	176	83	259	518	777	185	64	249	498	747
Lower trapezius	Surface	187	138	325	650	975	188	172	360	719	1,079
Latissimus dorsi	Surface	260	149	408	817	1,225	258	188	446	893	1,339
Serratus anterior	Surface	226	199	425	851	1,276	186	110	295	591	886
Biceps brachii	Surface	214	55	269	537	806	208	81	290	580	869
Supraspinatus	Indwelling	514	177	691	1,382	2,074	527	177	703	1,407	2,110
Infraspinatus	Indwelling	551	309	860	1,721	2,581	528	340	868	1,735	2,603
Upper subscapularis	Indwelling	554	328	882	1,764	2,647	495	356	851	1,702	2,553
Lower subscapularis	Indwelling	560	283	844	1,687	2,531	521	217	737	1,475	2,212

The UL, Nyquist rate, and triple the UL (3× UL) are included. All values are in Hz