shield. Here is the link with Psalms 18. Compare "strength" in Psalms 28:8, below.
trusted. confided. Hebrew. batah. App-69.
trusted... helped... praise. Note the reference to past, present, and future.
Related Commentaries of Psalms 28:7
Psalms 28:7
7 The LORD is my strength and my shield; my heart trusted in him, and I am helped: therefore my heart greatly rejoiceth; and with my song will I praise him.