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Thomas, C, Jones, PA, Rothwell, J, Chiang, CY, and Comfort, P. An investigation into the relationship between maximum isometric strength and vertical jump performance. J Strength Cond Res 29 (8): 2176–2185, 2015—Research has demonstrated a clear relationship between dynamic strength and vertical jump (VJ) performance; however, the relationship of isometric strength and VJ performance has been studied less extensively. The aim of this study was to determine the relationship between isometric strength and performance during the squat jump (SJ) and countermovement jump (CMJ). Twenty-two male collegiate athletes (mean±SD; age= 21.3±2.9 years; height= 175.63±8.23 cm; body mass= 78.06±10.77 kg) performed isometric midthigh pulls (IMTPs) to assess isometric peak force (IPF), maximum rate of force development, and impulse (IMP)(I100, I200, and I300). Force-time data, collected during the VJs …