Table 1.

Selected studies in the area training intensity distribution, percentages of three training intensity zones, the resulting polarization-index, and their classification according to the polarization-index and the original publication.

	Authors	Time or distance spent in			Polarization-Index (a.U.)	Classification according to
		Zone 1 (%)	Zone 2 (%)	Zone 3 (%)		Polarization-Index	Authors
1	Neal et al., 2013	80.0	0.0	20.0	3.18	Polarized	Polarized
2	Ingham et al., 2008	72.0	0.0	28.0	3.29	Polarized	Polarized
3	Stöggl and Sperlich, 2014	68.0	6.0	26.0	2.47	Polarized	Polarized
4	Bourgois et al., 2013	93.1	2.3	4.6	2.27	Polarized	Not classified
5	Treff et al., 2017	93.0	1.0	6.0	2.75	Polarized	Polarized
6	Neal et al., 2013	57.0	43.0	0.0	0.00	Non-polarized	Non-polarized (LT)
7	Stöggl and Sperlich, 2014	46.0	54.0	0.0	0.00	Non-polarized	Non-polarized (LT)
8	Plews and Laursen, 2017	67.3	30.2	2.5	0.75	Non-polarized	Non-polarized (pyramidal)
9	Stöggl and Sperlich, 2014	83.0	16.0	1.0	0.71	Non-polarized	Non-polarized (HVLT Int)
10	Plews and Laursen, 2017	80.4	17.9	1.8	0.91	Non-polarized	Polarized
11	Plews et al., 2014	77.3	16.9	5.8	1.42	Non-polarized	Polarized
12	Treff et al., 2017	94.0	4.0	2.0	1.67	Non-polarized	Non-polarized (pyramidal)
13	Guellich et al., 2009	95.0	3.0	2.0	1.80	Non-polarized	Non-polarized
14	Carnes and Mahoney, 2018	74.0	11.0	15.0	2.00	Non-polarized	Polarized
15	Stöggl and Sperlich, 2014	43.0	0.0	57.0	n.a.	–	HIT

LT, lactate threshold training; Hi HVLT, high volume low intensity; HIT, high intensity training. Bold letters indicate that classification according to polarization-index differs from classification in the original publication.