What happens to fatigue as pulse frequency increases?

As pulse frequency increases, fatigue typically increases due to the continuous stimulation of the muscles or nerves being engaged. When electrical pulses are delivered at a higher frequency, the muscle or nerve does not have enough time to recover or reset between stimulation events. This leads to a build-up of fatigue, as the muscle fibers become less responsive and require more time to recover from the constant firing. Higher frequencies can also lead to a situation where the muscle is being stimulated to contract at a rate that exceeds its capacity to perform effectively, further contributing to feelings of fatigue. Thus, as pulse frequency rises, the effects of fatigue become more pronounced.