Field testing of VO2peak in cross-country skiers with portable breath-by-breath system

Peak aerobic exercise responses were determined in 8 competitive cross-country skiers during field-testing and during an incremental treadmill test (TM) to determine peak oxygen uptake (VO(2)peak), heart rate, and oxygen pulse. Field testing consisted of maximal effort roller skiing using diagonal stride (DS) and double poling (DP) techniques. VO2 was measured during roller skiing by the portable Cosmed K4b(2) breath-by-breath system. The portable system was compared against a standard laboratory mixing box system, and no differences were found across the full range of VO2. During DS, VO(2)peak and oxygen pulse were not different from TM, whereas peak HR was lower. With DP, VO(2)peak and oxygen pulse were less than DS or TM,whereas peak HR was less than with TM but not different from DS. These results demonstrate the validity and utility of the portable breath-by-breath system for measurement of aerobic energy demand of athletes as they carry out their normal activity.