Heat suit training increases hemoglobin mass in elite cross-country skiers.

Purpose: The primary purpose was to test the effect of heat suit training on hemoglobin mass (Hb ) in elite cross-country (XC) skiers.

Methods: Twenty-five male XC-skiers were divided into a group that added 5 × 50 min weekly heat suit training sessions to their regular training (HEAT; n = 13, 23 ± 5 years, 73.9 ± 5.