title: Does voluntary hypoventilation during exercise impact EMG activity?
abstract: It has been reported that exercise under hypoxic conditions induces reduced muscle oxygenation, which could be related to enhanced activity on electromyography (EMG). Although it has been demonstrated that exercise under conditions of voluntary hypoventilation (VH) evokes muscle deoxygenation, it is unclear whether VH during exercise impacts EMG. Seven men performed bicycle exercise for 5 min at 65 % of peak oxygen uptake with normal breathing (NB) and VH. Muscle oxygenation; concentration changes in oxyhemoglobin (Oxy-Hb), deoxyhemoglobin (Deoxy-Hb) and total hemoglobin (Total-Hb); and surface EMG in the vastus lateralis muscle were simultaneously measured. In the VH condition, Oxy-Hb was significantly lower and Deoxy-Hb was significantly higher compared to those in the NB condition (P < 0.05 for both), whereas there was no significant difference in Total-Hb between the two conditions. We observed significantly higher values (P < 0.05) on integrated EMG during exercise under VH conditions compared to those under NB conditions. This study suggests that VH during exercise augments EMG activity.
authors.affiliation: Department of Integrated Arts and Science, National Institute of Technology, Okinawa College, 905, Henoko, Nago, Okinawa 905-2192 Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kume
authors.affiliation: Department of Health and Sports Science, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama 701-0193 Japan.
authors.forename: Shogo
authors.initials: S
authors.lastname: Akahoshi
authors.affiliation: Department of Clothing, Japan Women's University, 2-8-1, Mejirodai, Bunkyoku, Tokyo 112-8681 Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamagata
authors.affiliation: Department of Health and Sports Science, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, Okayama 701-0193 Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Wakimoto
authors.affiliation: Department of Nursing, Hyogo University, 2301, Hiraokachoshinzaike, Kakogawa, Hyogo 675-0195 Japan.
authors.forename: Noriki
authors.initials: N
authors.lastname: Nagao
keywords: Electromyography; Exercise; Hypoventilation; Hypoxia; Muscle oxygenation