Exercise physiology loss of integrity to the blood brain barrier. Hyperthermia also can lower cerebral blood flow, and raise brain temperature. Researchers once attributed fatigue to a build-up of lactic acid in muscles. However, this is no longer believed. Rather, lactate may stop muscle fatigue by keeping muscles fully responding to nerve signals. The available oxygen and energy supply, and disturbances of muscle ion homeostasis are the main factor determining exercise performance, at least during brief very intense exercise. Each muscle contraction involves an action potential that activates voltage sensors, and so releases Ca ions from the muscle fibre’s sarcoplasmic reticulum. The
Kegel exercise to consumers as improving sex or orgasms, increasing "energy", "balancing hormones", and as having other health or lifestyle benefits. There is no evidence for any of these claims, and many of them are pseudoscience. Kegel exercise Kegel exercise, also known as pelvic floor exercise, consists of repeatedly contracting and relaxing the muscles that form part of the pelvic floor, now sometimes colloquially referred to as the "Kegel muscles". The exercise can be performed multiple times each day, for several minutes at a time, for one to three months, to begin to have an effect. Kegel exercises can make the pelvic