I'm looking at a model to make better sense of 1-10 Borg Scale force ratings, and need info related to the correlation between hand grip strength and other hand/finger force types (pinch grip, press w/ fingers, press w/ thumb, etc.).
i'm not awared of any other study related to the correlation between more than one type of hand grip force. However i found this study which measured variables like force, acceleration and muscle activity (by electromiography) in the hand grip.