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Purpose  To investigate the relationships between maximal aerobic speed (MAS), lactate threshold in per cent of peak oxygen uptake (LT) and velocity at LT (LT v ) in cross-country skiers. Secondly, we aimed to explore the fit of an equation previously used in cyclists and runners in a cohort of well-trained, competitive cross-country skiers for calculation of LT v . Thirdly, we aimed to investigate if a new LT v  could still be calculated after a period of regular training only by providing a new MAS.    Methods  Ninety-five competitive cross-country skiers (65 males and 30 females) were tested for maximal oxygen uptake (VO 2max ), peak oxygen uptake in double poling (DP-VO 2peak ), oxygen cost of double poling (C DP ), LT, and LT v . Thirty-five skiers volunteered to be tested 3 months later to evaluate potential changes in LT and LT v .    Results  Velocity at LT was mainly determined by MAS ( r  = 0.88,  p  &amp;lt; 0.01). LT did not show a significant impact on LT v . The product of MAS·LT precisely predicted LT v  at baseline ( r  = 0.99, SEE = 2.4%), and by only measuring MAS, a new LT v  could be accurately calculated ( r  = 0.92, SEE = 6.8%) 3 months later in a sub-set of the initial 95 skiers ( n  = 35).    Conclusion  The results suggest that LT has minor impact on LT v  in DP tested in a laboratory. LT v  seemed to be predominantly determined by MAS, and we suggest to put more focus on MAS and less on LT and LT v  in regular testing to evaluate aerobic performance capacity in DP.

Relationships Between Maximal Aerobic Speed, Lactate Threshold, and Double Poling Velocity at Lactate Threshold in Cross-Country Skiers