Research progress on anti-G straining maneuver and its indisensability in G-LOC protection

Objective To overview and analyze the research progress in respect of anti-G straining maneuver(AGSM) and G induced loss of consciousness(G-LOC) protection so as to provide ideas and references to the institution of standardized AGSM training procedure and method.Literature resource and selection Domestic and abroad research articles and reports in this field.Literature quotation Sixty-two domestic and abroad references were cited. Literature synthesis This article reviewed and discussed the historical development of different AGSMs and their respective merits and demerits,the necessity and the physiological mechanisms of AGSM in G-LOC protection,and the application and training of AGSM. Conclusions Correctly performing AGSM is an important and the most cost-effective mean on reducing the risk of G-LOC.Although there appeared several variations of AGSM,their common purpose is to increase the heart level blood pressure so as to maintain the cerebral blood flow.Some AGSMs could achieve a satisfactory laboratory result,but they are unfavorable for aerial application.HP and PHP maneuvers have been proven to be the best choice and arc being popularized among Chinese fighter pilots.The significance of AGSM training either on ground or on human centrifuge is accentuated.The evaluation of HP and PHP maneuvers combined with anti-G system and the institution of its standardized training procedure and method are desiderated to assure pilots' performance of an optimally effective AGSM for minimizing the aircraft and aircrew losses due to G-LOC in flight. Key words: Anti-G straining maneuver;  Acceleration;  Unconsciousness;  Physical endurance; Gravity suits;  Positive pressure respiration;  Physical education and training