Cycling and high G-force training

Recently completed high G training at a centrifuge for Air Force pilot training and one thing that came up was how to get better at tolerating G forces. The recommendation was to do 4-12 reps of explosive movements with focus on legs and core. They also said endurance training can have negative effects.

During high G maneuvering and G forces you are supposed to anti G strain (AGSM) which involves flexing all of your lower body muscles and abs while maintaining oxygen levels with short breaths every 3 seconds. The goal of this is to maintain pressure in your head, as the pressure drops you lose vision and then you G-loc (pass out). These stretches were all for 15 seconds or less and should be able to be repeated with 5 seconds or less of rest.

My question is how can endurance training, specifically cycling, have negative effects on G tolerance? It seems strange given that cycling helps with leg muscle activation and endurance, yet it may have a negative effect during a maneuver where you want to fully flex your legs. My thought is that it may have something to do with blood pressure (higher resting blood pressure means more Gz in order to get to vision loss/G-loc). Any input would be appreciated!

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My first (and only) guess would be lower viscosity. If I remember correctly one of the adaptations of endurance training is increased blood plasma volume which results in a decrease in viscosity. Good if you’re pumping it, bad if it needs to resist a g-force.

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Based on what I’ve read, I think that’s exactly it.

Endurance athletes tend to have lower blood pressure, which means higher susceptibility to G-loc.

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