The impact of firefighter personal protective equipment and treadmill protocol on maximal oxygen uptake

This study investigated the effects of firefighter personal protective equipment (PPE) on the determination of maximal oxygen uptake (VO _2max)while using two different treadmill protocols: a progressive incline protocol (PIP) and a progressive speed protocol (PSP), with three clothing conditions (Lightlight clothing; Boots-PPE with rubber boots; Shoes-PPE with running shoes). Bruce protocol with Light was performed for a reference test. Results showed there was no difference in VO_{2 max} between Bruce Light, PIP Light, and PSP Light. However, VO _2max was reduced in Boots and Shoes with shortened maximal performance time (7 and 6 min reduced for PIP Boots and Shoes, respectively; 11 and 9 min reduced for PSP Boots and Shoes, respectively), whereas the increasing rate of VO₂ in Boots and Shoes during submaximal exercise was greater compared with Light. Wearing firefighter boots compared with wearing running shoes also significantly affected submaximal VO₂ but not VO_2max. These results suggest that firefighters' maximal performance determined from a typical VO_2max test without wearing PPE may overestimate the actual performance capability of firefighters wearing PPE.