Reply To: Balance between muscle contractions (concentric/eccentric/isometric)
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Ryan is correct. The only testing of isometrics I am aware of in relation to performance are the following
Grip testing - dynomometer
Isometric pulling force at the top of extension (think rack pull at the hip) - correlated to power development
Top ROM in the squat - again to measure power and force development
And top ROM in the bench press for same reasons above.
Other than that, like Ryan said, you are going to have a different isometric strength ability at almost every degree of change in the joint (bottom of bench press vs top of bench press). So the data is so large that is is irrelevant. It won't correlate with anything except what happens at that exact moment of flexion in the joint.