Physiologic Evaluation of the L1/M1 Anti-G Straining Maneuver

摘要

The primary objective of this investigation was to test the use of a relativelysimple (non-invasive) system to enable continuous monitoring of human muscle performance and reserve capability, as well as prediction of physical competence during repetitive execution of the L1/M1 anti-G straining maneuver (AGSM). Ten healthy volunteers tested this system while seated in a special mockup of an F-16 pilot seat. They were instructed to perform repetitive AGSMs, each at their maximal force capability. By comparing the initial Force Output and Electromyograph magnitudes with subsequent values, an index of muscle fatigue and reserve capability can be derived. Both Fo and EMG were found able to predict physical competence for performing AGSMs. Some subjects perceived their Fo to be maintained at the original maximum voluntary contraction (MVC) level due to their maximal effort contractions. However, it was clearly seen that Fo progressively deteriorated with muscle fatigue.