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SHEEL, A. W., N. SEDDON, A. KNIGHT, D. C. MCKENZIE, and D. E. R. WARBURTON. Physiological Responses to Indoor Rock-Climbing and Their Relationship to Maximal Cycle Ergometry. Med. Sci. Sports Exerc., Vol. 35, No. 7, pp. 1225–1231, 2003.To quantify the cardiorespiratory responses to indoor climbing during two increasingly difficult climbs and relate them to whole-body dynamic exercise. It was hypothesized that as climbing difficulty increased, oxygen consumption (O2) and heart rate would increase, and that climbing would require utilization of a significant fraction of maximal cycling values.Elite competitive sport rock climbers (6 male, 3 female) completed two data collection sessions. The first session was completed at an indoor climbing facility, and the second session was an incremental cycle test to exhaustion. During indoor climbing subjects were randomly assigned to climb two routes designated as “harder” or “easier” based on their previous best climb. Subjects wore a portable metabolic system, which allowed measurement of oxygen consumption (O2), minute ventilation (E), respiratory exchange ratio (RER), and heart rate. During the second session, maximal values for O2, E, RER, and heart rate were determined during an incremental cycle test to exhaustion.Heart rate and O2, expressed as percent of cycling maximum, were significantly higher during harder climbing compared with easier climbing. During harder climbing, %HRmax was significantly higher than %O2max (89.6% vs 51.2%), and during easier climbing, %HRmax was significantly higher than %O2max (66.9% vs 45.3%).With increasing levels of climbing difficulty, there is a rise in both heart rate and O2. However, there is a disproportional rise in heart rate compared with O2, which we attribute to the fact that climbing requires the use of intermittent isometric contractions of the arm musculature and the reliance of both anaerobic and aerobic metabolism.