Are there two forms of isometric muscle action? Results of the experimental study support a distinction between a holding and a pushing isometric muscle function

Table 1 Overview of endurance parameters of the fatiguing measurements comparing PIMA vs. HIMA

	Total isometric phase [s]		Mean of all single iso. phases [s]		Longest single isometric phase [s]		Relation of longest single iso. phase to total iso. phase
	Total isometric phase [s]		Mean of all single iso. phases [s]		Longest single isometric phase [s]		PIMA		HIMA
Vpn	PIMA	HIMA	PIMA	HIMA	PIMA	HIMA	M 1	M 2	M 1	M 2
1	83.850	65.201	83.850	10.867	88.203	25.987	1.000	1.000	0.499	0.237
2	61.890	59.962	11.770	7.270	28.176	14.017	0.489	0.292	0.095	0.309
3	50.938	32.765	16.072	7.421	41.891	15.643	0.602	0.556	0.445	0.461
4	38.742	49.067	15.494	7.284	25.257	16.222	0.616	0.613	0.251	0.361
5	53.416	51.269	14.351	12.613	41.094	27.843	0.271	0.835	0.340	0.603
6	60.284	48.820	6.694	3.394	19.274	10.189	0.199	0.339	0.148	0.229
7	67.613	56.048	11.113	6.420	25.010	19.373	0.299	0.401	0.318	0.222
8	37.853	41.237	19.040	6.206	44.280	18.976	1.000	0.822	0.379	0.329
9	80.873	57.573	56.206	12.315	82.155	33.670	1.000	0.932	0.410	0.407	M1 & M2
10	53.024	38.020	9.941	3.379	18.499	8.900	0.325	0.298	0.097	0.175	PIMA	HIMA
M	58.848	49.996	24.453	7.717	41.384	19.082	0.580	0.609	0.298	0.333	0.594	0.316
SD	15.526	10.250	25.128	3.282	24.896	7.929	0.320	0.273	0.145	0.131	0.290	0.136
CV	0.264	0.205	1.028	0.425	0.602	0.415	0.552	0.448	0.487	0.392	0.488	0.430
p	.029		.049		.005		.000

Listed are the following items of each subject (Vpn; mean value of two measurements): the total isometric phase, the mean duration of all single isometric phases, the longest single isometric phase and the relation of the longest isometric phase to the total isometric phase. Furthermore the arithmetic mean (M), the standard deviation (SD) as well as the coefficient of variation (CV) and the results of the t-tests are displayed (α = .05). M1 = 1^st measuring, M2 = 2^nd measuring

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