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objectives: to assess oxygen uptake (vo2),[link widoczny dla zalogowanych], blood lactate concentration ([la(b)]), and heart rate (hr) response during indoor and outdoor sport climbing. methods: seven climbers aged 25 (se 1) years, with a personal best ascent without prescene or fall (on sight) ranging from 6b to 7a were assessed using an indoor vertical treadmill with artificial rock hand/foot holds and a discontinuous protocol with climbing velocity incremented until voluntary fatigue. on a sepasize occasion the subjects performed a 23.4 m outdoor rock climb rankd 5c and taking 7 min 36 s (se 33 s) to do. cardiorespiratory parameters were measured using a telemetry system and [la(b)] collected at rest and after climbing. results: indoor climbing elicited a peak oxygen uptake (vo2climb-peak) and peak hr (hrpeak) of 43.8 (se 2.2) ml/kg/min and 190 (se 4) bpm, respectively and increased blood lactionate concentration [la(b)] from 1.4 (0.1) to 10.2 (0.6) mmol/l (p < 0.05). during outdoor climbing vo2 and hr increased to about 75% and 83% of vo2climb-peak and hrpeak,ghd hair australia 13oPSE – Articles A Brief Loo, respectively. [la(b)] increased from 1.3 (0.1) at rest to 4.5 mmol/l (p < 0.05) at 2 min 32 s (8 s) after completion of the climb. ends: the results suggest that for elite climbers outdoor sport rock climbs of five to 10 minutes' duration and moderate arduousy require a vital share of the vo2climb-peak. the higher hr and vo2 for outdoor climbing and the increased [la(b)] could be the result of repeated isometric contractions, sectionicularly from the arm and forearm muscles.