Table 2

Training variables and symptom incidence by sex, performance level, training phase and season during 7016 person-weeks for 37 elite cross-country skiers

FactorEndurance Daily training volume (h:min)Daily TRIMPAll symptomatic events (% of weeks)RTI events (% of weeks)GII events (% of weeks)Weeks (% of factor)
I-zone 1 (%)I-zone 2 (%)I-zone 3 (%)I-zone 4 (%)I-zone 5 (%)Str/Pw (%)Sprint (%)
Total7934328202:20±01:19192±1146.65.80.87016 (100)
 Male7844327102:11±01:20181±1167.46.60.83402 (48)
 Female7933328202:28±01:18203±1115.95.20.73614 (52)
Performance level
 IL7844327202:14±01:20187±1157.46.70.73298 (47)
 WL8033327202:24±01:19197±1125.95.10.83718 (53)
 Transition76542111102:15±01:16183±1087.36.50.8629 (9)
 General prep.7844318202:42±01:24221±1165.34.90.43150 (45)
 Specific prep.8123337102:16±01:08186±966.75.61.11252 (18)
 Competition8123445101:53±01:03162±1088.67.51.11673 (24)
 Regeneration7653439001:10±01:07102±1167.76.71.0312 (4)
 Spring7744338101:50±01:14155±1188.07.30.61404 (20)
 Summer7944218202:44±01:26222±1174.13.80.41887 (27)
 Autumn7934318202:34±01:18210±1096.55.60.91901 (27)
 Winter8123346201:06±01:07171±998.37.11.21824 (26)
  • For endurance training in each of the five intensity zones, strength/power (Str/Pw) and sprint training values are percentages of total training volume. Daily training volume and daily training impulse (TRIMP) are presented as mean±SD.

  • GII, gastrointestinal infection; IL, international-level athletes; I-zone, intensity zone; RTI, respiratory tract infection; WL, world-leading athletes (minimum one individual senior Olympic/World Championship medal).