The method of delivering chest compressions remains the same, as does the rate (at least 100 per minute). It is hoped that the use of compression-only delivery will increase the chances of the lay public delivering CPR.
Much like when crack your knuckles, loud popping noises from your knees are most likely caused by what is called cavitation. Cavitation results from a change in joint pressure that allows carbon dioxide, which is normally dissolved in your joint fluidâa.k.a.
Your quadriceps at the front of your thighs extend your knees to help propel you off the floor. At the hips, your glutes and hamstrings contract to extend your hips for the jumping component. When you swing your legs out, your gluteus medius, gluteus minimize, tensor fasciae latae and sartorius are responsible.