Such crescendos are often marked by the composer , but sometimes they are not .
象这样的声音渐强的符号经常由作曲家标示出来，但有时他们也不标出。
The researchers found that selections with crescendos , especially those with a series of them ( think : queen 's bohemian rhapsody ) , led to proportional constriction of blood vessels and increases in blood pressure , heart rate and respiration .
Understanding the mechanisms of how swelling crescendos and deflating decrescendos affect our physiology , he suggests , could lead to potential new therapies for stroke and other conditions .
The songs here are gorgeous as they slowly build in intensity , as the string arrangements swirl , the guitars jangle and the vocals steeply climb atop the thundering crescendos .
