Almost 1,700 cyclists were hospitalised due to crashes last year.
According to Freedom of Information figures released to Newstalk, it includes nearly 200 children under the age of nine.
A total of 1,693 people were hospitalised after road crashes or transport accidents in 2021.
It includes almost 1,300 men and 400 women.
Martina Callinan is the deputy chairperson of Galway Cycling Campaign.
"The HSE day-case and inpatient care figures for cycling injuries paint a really grim picture.
"Particularly for children and teenagers, and also for middle-aged people aged 40 to 59.
"The rates of recorded injury are highest in these two groups".
In total, 583 cyclists aged under-19 were hospitalised last year - including 192 under the age of nine.
Ms Callinan says action is needed.
"Children and teenagers are more likely to be cycling close to home.
"They're playing with their friends outside the front door, going up and down the streets on their bikes, they're cycling to school.
"They're using their bike to cycle independently to GAA training, chess club and drama classes.
"They're in their neighbourhood"
These figures only include inpatient and day-case presentations.
They do not account for Emergency Department admissions - meaning the total figure could be higher.