The efficiency of oxygen supply to tissues is a factor in the severity of important diseases such as Covid-19 and heart conditions.
Scientists already know that the relationship between the length of a person's index and ring fingers, known as the 2D:4D ratio is correlated with performance in distance running, age at heart attack and severity of Covid-19.
Now Swansea University digit ratio expert Professor John Manning has been working with colleagues to look more closely at the subject.The research analysed 133 professional football players as they underwent a series of body measurements which included measuring digit lengths from hand scans. They also completed an incremental cardiopulmonary test to exhaustion on a treadmill.
"The players with long ring digits relative to their index digits have efficient oxygen metabolism such that they reach very high maximal oxygen consumption in an incremental cardiopulmonary test to exhaustion on a treadmill." He added:"Our findings are consistent with those from distance running, where long 4D is related to high performance, and heart disease and Covid-19 where long 4D is linked to low severity of disease.
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