STUDY: Respiratory Muscle Training and Cognitive Function Exercising at Altitude Quackenbush J, Duquin A, Helfer S, Pendergast DR. This study, published in Aerospace Medicine and Human Performance (AMHP), formerly Aviation, Space, and Environmental Medicine, examined the effects that voluntary isocapnic hyperventilatory training of the respiratory muscles (VIHT) has on selected measures of executive functioning, including working memory and processing speed at simulated altitude up to 12,000 ft. Conclusion: The study concluded VIHT improved processing speed and working memory during exercise at altitude. Read the full article here >