Table 4. Correlations of field- and laboratory-based tests with distance FIS points as well as with overall performance and performance in different terrains of a 13.6-km roller-ski skating competition in a group of national-level male cross-country skiers (n = 33).

	FIS points	Roller-ski skating competition
		Overall time (s)	Uphill terrain (s)	Intermediate terrain (s)	Downhill terrain (s)
Field tests
1.3-km uphill DP TT (s)	0.56**	0.69**	0.66**	0.66**	0.66**
6.4-km uphill running TT (s)	0.72**	0.70**	0.72**	0.66**	0.43*
Anthropometrics
Body mass (kg)	-0.12	-0.20	-0.10	-0.31	-0.25
Body mass index (kg·m-2)	-0.16	-0.14	-0.08	-0.19	-0.18
Submaximal test running (8 km·h -1 )
VO2 in %VO2max	0.74**	0.79**	0.79**	0.72**	0.70**
Heart rate in %HRmax	0.64**	0.69**	0.63**	0.71**	0.62**
Borg (6–20)	0.44**	0.32	0.30	0.36	0.20
Blood lactate (mmol·L-1)	0.41*	0.49**	0.44**	0.56**	0.38*
TTE test running
VO2max (L·min-1)	-0.57**	-0.66**	-0.70**	-0.70**	-0.62**
VO2max (mL·min-1·kg-1)	-0.69**	-0.76**	-0.80**	-0.65**	-0.64**
TTE (s)	-0.74**	-0.87**	-0.90**	-0.80**	-0.70**
Speedpeak (km·h-1)	-0.75**	-0.87**	-0.88**	-0.80**	-0.70**
Submaximal test roller-ski skating (12 km·h -1 )
VO2 in % VO2peak	0.61**	0.73**	0.74**	0.64**	0.69**
Heart rate in %HRpeak	0.54**	0.71**	0.73**	0.62**	0.58**
Borg (6–20)	0.20	0.30	0.25	0.34	0.30
Blood lactate (mmol·L-1)	0.49*	0.57**	0.58**	0.52**	0.50**
Gross efficiency (%)	-0.09	-0.27	-0.30	-0.19	-0.26
TTE test roller-ski skating
VO2peak (L·min-1)	-0.51**	-0.57**	-0.50**	-0.62**	-0.50**
VO2peak (mL·min-1·kg-1)	-0.70**	-0.70**	-0.71**	-0.63**	-0.60**
TTE (s)	-0.63**	-0.79**	-0.80**	-0.72**	-0.64**
Speedpeak (km·h-1)	-0.65**	-0.80**	-0.81**	-0.73**	-0.69**

FIS, International Ski Federation; DP, double-poling; TT, time-trial; VO₂ = oxygen uptake; HR_max = maximal heart rate; TTE = time to exhaustion; Speed_peak = peak treadmill speed; VO_2max = maximal oxygen uptake; HR_peak = peak heart rate; VO_2peak = peak oxygen uptake.

*p<0.05;

**p<0.01.