I really don’t believe in the idea of shouting during prayer(reminds me of the Pharisees). God’s not deaf,if He can hear the mumblings of Hannah or the silent prayers Jesus said bfr feasts and all that…why should I shout? Even when you say stuffs in your mind He knows because He knows the deepest secrets of man( God is the only one that reads minds/heart).
But then,people could be moved by the Holy Spirit that they wouldn’t even know that they’re shouting. Let’s take instance from the coming of the Holy Spirit to the disciples that people thought they were drunk, or the shout of Israelites during their march round the walls of Jericho or that of Elijah during his contest with the prophets of Baal,or the shouts of Christ on the cross(asked God why He forsook Him and when committed His soul and said it’s finished,to mention but a few. Some people aren’t genuinely moved by the spirit while praying and some are.
At times,the Spirit doesn’t move one to shout while praying. See ehn,everything is concealed in the heart. I think we should leave it for God sef to say whether He’d answer such prayers or not.