Purpose: To establish whether measurements obtained from the isometric mid-thigh pull (IMTP) or isometric squat (ISQT) relate to performance of a dynamic one-repetition maximum (1RM) for the barbell back squat. Methods: Eight resistance trained men (22.9±3.7yrs; 177.3±5.7cm; 84.9±17.4kg; 1RM: 1.89 ± 0.29x body weight) completed two separate visits: a preliminary visit, during which participants completed a 1RM of the back squat, and IMTP and ISQT familiarization. At least 72 hours later (Day 2) participants completed the IMTP and ISQT. Prior to all testing, participants cycled for 5-minutes at a submaximal intensity followed by 10 bodyweight squats and 10 walking lunges. Briefly, participants were fitted for the IMTP at 110° at the hip and at 75% of their standing stature for ISQT. Participants completed 3 maximal effort, 6-second attempts of both IMTP and ISQT, with each attempt separated by 3 minutes of seated rest. Isometric force and rate of force development (RFD) were recorded at 1,000Hz, and correlated with 1RM values with a Pearson Product Moment Correlation. Results: A significant positive correlation was observed between the peak RFD of ISQT and 1RM load (r=0.746, p=0.034). No other significant correlations were observed between force production or RFD for IMTP or ISQT. Conclusions: The peak RFD for ISQT had the greatest relationship with 1RM, however, the results of this project are preliminary and likely require data larger sample size.