The aim of this study was to evaluate if performing cognitive task while doing low intensity repetitive work is able to increase oxygen consumption (VO₂) in two different ambient temperatures. Ten healthy men performed continuous wrist flexion-extension repetitive work at 10% maximal voluntary contraction (MVC) for one hour. During the last 30 minutes they also performed a cognitive task (Verbal Span test). Participants performed these tasks in thermoneutral (25°C) and cold (5°C) ambient temperature. Oxygen consumption (VO₂) was measured continuously throughout the experiments. We observed that skin temperature was stable in thermoneutral (33.00.1°C) but significantly decreased in cold (26.10.2°C, p<=0.05). Oxygen consumption during repetitive work was 4.20.2 and 5.10.1 ml.min^-1.kg^-1 at 25 and 5°C, respectively. Adding the cognitive task increased VO₂ to 4.60.2 and 6.50.4 ml.min^-1.kg^-1 (p<=0.05). The percentage increase in VO₂ due to adding cognitive task was 9 and 21% at 25 and 5° C, respectively. The combination of repetitive work and cognitive task at 5°C was able to increase VO₂ by 35% (p<=0.05) as compared to performing only repetitive work at 25°C. In conclusion, performing cognitive task together with low intensity work is able to significantly increase VO₂, especially in cold ambient temperature. This should be taken into account while giving instructions to workers performing similar tasks at low ambient temperatures.