Exceeding noise levels of 100 decibels, the grunting sounds produced by some tennis players when hitting the ball are on a par with motorbikes or chainsaws.
from
https://healthnews010.wordpress.com/2019/05/04/study-explores-how-grunting-influences-perception-in-tennis/
from https://karlfletcher.blogspot.com/2019/05/study-explores-how-grunting-influences.html
from
https://karlfletcher1.tumblr.com/post/184638371133
from https://davidrawlins1.blogspot.com/2019/05/study-explores-how-grunting-influences.html
from
https://davidrawlins1.tumblr.com/post/184638512851
from http://bit.ly/2Llm4pH
from
https://jamesprice01.tumblr.com/post/184638603644
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