I doubt it has anything biologically due to being men and boys, but just physical activity.
More contracting your arm muscle, more mRNA getting squeezed into your blood or lymph and causing damage. More muscle, more larger veins that can get injected into or punctured by the needle.
I doubt it has anything biologically due to being men and boys, but just physical activity.
More contracting your arm muscle, more mRNA getting squeezed into your blood or lymph and causing damage. More muscle, more larger veins that can get injected into or punctured by the needle.