<b>Purpose:</b> To compare peak work rate (WR_peak) and associated physiological and biomechanical performance-determining variables between flat and uphill cross-country (XC) sit-skiing. <b>Methods:</b> Fifteen able-bodied male XC skiers completed 2 test sessions, each comprising four 4-minute submaximal stages, followed by an incremental test to exhaustion and a verification test in ...