筋組織(muscle tissue) は体が伸縮する助けをします。 筋組織には三種類あり、骨と結合した筋肉、骨格筋(skeletal muscle)、 胃、腸、血管や他の器官等にみられる、平滑筋(smooth muscle) 、 心臓に見られる筋肉、心筋(cardiac muscle) があります。

In experiments first reported in 1998, Baumeister and his collaborators discovered that the will, like a muscle, can be fatigued. Immediately after students engage in a task that requires them to control their impulses — resisting cookies while hungry, tracking a boring display while ignoring a comedy video, writing down their thoughts without thinking about a polar bear or suppressing their emotions while watching the scene in “Terms of Endearment” in which a dying Debra Winger says goodbye to her children — they show lapses in a subsequent task that also requires an exercise of willpower, like solving difficult puzzles, squeezing a handgrip, stifling sexual or violent thoughts and keeping their payment for participating in the study rather than immediately blowing it on Doritos. Baumeister tagged the effect “ego depletion,” using Freud’s sense of “ego” as the mental entity that controls the passions.

As thehistorian Jean Leclercq, himself a Benedictine monk, puts it, ‘in theMiddle Ages, one generally read by speaking with one’s lips, at leastin a whisper, and consequently hearing the phrases that the eyessee’.6

And the good news about it is that you can actually train your attention, and it’s not that difficult. In fact, almost every contemplative meditation discipline has to do with just sitting down and paying attention to your breath and noticing how your attention changes. There is a saying that comes from the neuroscientists that neurons that fire together are wired together. When you begin paying attention to your attention, you are developing a capability that enables you to have more control over what’s occupying your mind space.

Some individuals can voluntarily produce this rumbling sound by contracting the tensor tympani muscle of the middle ear. The rumbling sound can also be heard when the neck or jaw muscles are highly tensed as when yawning deeply. This phenomenon has been known since (at least) 1884.

“Henneman’s size principle” and it provides the basis for why Myo Reps work so well.Evolution is an effective optimizer. If you are wasting energy, you’re dead. That sounds harsh in the modern, comfortable world, but it’s true, and a large part of how our muscles contract. The brain — via the central nervous system — will only contract as few muscles as it takes to get the job done. If you are walking down the street at a moderate pace, only your weakest muscle fibers will activate, not your strongest ones.

Likewise, the significant (P<0.01) increases in mean cross-sectional area (and total muscle volume) were equal in both groups. Finally, strength increases were identical for both groups (PT=25% and NA=26% improvement). The results of this study suggest that muscle rebuilding – for example, hypertrophy – can be initiated independent of any discernible damage to the muscle.

CONCLUSIONS: After 9 wk of training, the gains in both isometric and dynamic lifting strength were similar for the two arms. A single bout of damaging eccentric work did not enhance the response to conventional strength training and significantly compromised strength gains for several weeks.