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Astorino, TA, Robson, T, and McMillan, DW. Classifying intensity domains from arm cycle ergometry differs versus leg cycling ergometry. J Strength Cond Res 37(11): 2192-2199, 2023--This study compared the distribution of exercise intensity domains in response to progressive leg cycle ergometry (LCE) and arm cycle ergometry (ACE). Seventeen active men and women (age and body fat 5 26 6 7 years and 18 6 3%) initially performed graded exercise on each modality to assess maximal oxygen uptake (VO2max) and peak power output (PPO). Using a randomized crossover design, they subsequently performed moderate intensity continuous exercise consisting of three 15-minute bouts at 20, 40, and 60% PPO on each modality. Gas exchange data (VO2, VCO2, and VE), respiratory exchange ratio, heart rate (HR), blood lactate concentration (BLa), and perceptual responses were acquired. Only 2 subjects were classified in the same intensity domains across modalities, with LCE eliciting more subjects exercising at "vigorous" and "near-maximal" intensities than ACE. Time spent above 70 (22 6 7 vs. 15 6 8 minutes, d 5 1.03) and 80 %HRmax (15 6 6 vs. 9 6 6 minutes, d 5 1.04) was significantly greater with LCE vs. ACE. Compared with ACE, LCE revealed significantly higher (p,0.05) peak (9466 vs. 8869 %HRmax, d50.81) and mean HR (7366 vs. 6666 %HRmax, d51.20), VO2 (5465 vs. 50 6 7 %VO2max, d 5 0.68), and BLa (5.5 6 2.0 vs. 4.7 6 1.5 mM, d 5 0.48). The results exhibit that progressive leg cycling at identical intensities elicits a greater cardiometabolic stimulus than ACE. [ABSTRACT FROM AUTHOR]