Aerobic capacity is not improved following 10-day supplementation with peppermint essential oil

This study examined the effects of peppermint essential oil (PEP) on aerobic capacity. Seven healthy participants performed a graded maximal exercise test following 10-days of ingesting either PEP or a control in a randomised cross-over design. There was no significant difference between control and PEP trials for expired gas variables (V ̇O2 peak 3.54 vs. 3.52 L/min) or performance measures (time to exhaustion 583.33 vs. 587.04 seconds). Similarly, resting cardio-pulmonary measures were also unchanged between visits.