Exercise Improves Mood State in Normobaric Hypoxia

BACKGROUND: The purpose of this study was to quantify the efficacy of using exercise to alleviate the impairments in mood state associated with hypoxic exposure. METHODS: Nineteen young, healthy men completed Automated Neuropsychological Assessment Metrics-4th Edition (ANAM4) versions of the mood state test before hypoxia exposure, after 60 min of hypoxia exposure (12.5% O-2), and during and after two intensities of cycling exercise (40% and 60% adjusted (V)over dot o(2max)) under the same hypoxic conditions. Peripheral oxygen saturation (Sp02) and regional cerebral oxygen saturation (rSo(2)) were continuously monitored. RESULTS: At rest in hypoxia,Total Mood Disturbance (TMD) was significantly increased compared to baseline in both the 40% and 60% groups. TMD was significantly decreased during exercise compared to rest in hypoxia.TMD was also significantly decreased during recovery compared to rest in hypoxia. Spo(2) significantly decreased at 60 min rest in hypoxia, during exercise, and recovery compared to baseline. Regional cerebral oxygen saturation was also reduced at 60 min rest in hypoxia, during exercise, and recovery compared to baseline. DISCUSSION: The current study demonstrated that exercise at 40% and 60% of adjusted (V)over dot o(2max) attenuated the adverse effects of hypoxia on mood. These findings may have significant applied value, as negative mood states are known to impair performance in hypoxia. Further studies are needed to replicate the current finding and to clarify the possible mechanisms associated with the potential benefits of exercise on mood state in normobaric hypoxia.