In biceps tendonitis there is often a significant drop in range at the angle where the peak musculo-tendonis force passes through the affected part of the tendon.

Or in other words the drop could be at the begining, end or within range. The point of the drop indicates the part of the tendon injured.

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The curve tends to be very erratic due to pain inhibition. The eccentric strength decreases first followed by the concentric strength. Patients often only address the problem when the concentric strength has started to reduce. This type of curve will normally 'smooth out' as the problem resolves.

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