The back muscles, specifically the upper and lower trapezius, are involved in the shoulder shrug. http://www.exrx.net/WeightExercises/TrapeziusUpper/DBShrug.html
primary muscle used - deltoids secondary muscle used - upper traps
trapesius
The primary muscles activated by the barbell shrug are the trapezius, or traps, and rhomboids
The primary muscles activated by the barbell shrug are the trapezius, or traps, and rhomboids
The primary muscles activated by the barbell shrug are the trapezius, or traps, and rhomboids
medial deltoid(shoulders), traps & biceps
primarily the biceps, also the pectorals (pecs), and shoulder, and abs (most of the upper body really)
A barbell is used in the sport of professional weightlifting.
Barbell exercises can be used to target the muscles in the upper and lower lats, as well as the lower back muscles. A good back workout using barbells is the Barbell Good Morning. An individual starts by holding the barbell behind one's shoulders with both hands, and then leaning forward until their upper body is perpendicular with the floor. The individual then raises their upper body until they are standing, and slowly lower it back after a short pause. One should breathe out while raising one's self, and breathe in when lowering one's self back down.
The miners would shrug off their fatigue and continue to dig in hopes of freeing their trapped comrades.When asked why he had done it, the suspect simply gave a shrug of his shoulders by way of reply.
the clavical, scapula, and humerus
I don't know what you mean by momentary muscular failure. Surely if this happens he won't succeed in lifting the barbell? Lifting a barbell or indeed any muscular work done involves chemical changes in the muscles which provide the energy required, in this case raising the weight against the force of gravity. The energy used to lift a weight m kg a height of h meters is 9.81 x m x h joules.
barbell
well, it depends on what your doing. like if u were to play soccer u would use your leg musles.