Effect of the Valsalva maneuver on tolerance to +G z  acceleration.
D000054:Acceleration; D000328:Adult; D000337:Aerospace Medicine; D001794:Blood Pressure; D006112:Gravitation; D006339:Heart Rate; D006801:Humans; D008297:Male; D011481:Protective Clothing; D014636:Valsalva Maneuver