There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players. Seventeen male (age: 19.5 ± 2.3 years) rugby union players performed a conventional maximal isoinertial resistance loading protocol. Countermovement jump (CMJ) and maximal voluntary isometric contraction (MVC) performance was measured on three occasions: at baseline, immediately post and 48h post. The results indicated that the decrease in MVC (9.7%) is greater than or comparable with the CMJ output variables (4.2-10.3%), immediately post exercise. Whilst isometric strength had demonstrated a full recovery at 48h post, many of the key CMJ output variables were still impaired (P <0.05). Similar findings were observed in the normalised CMJ curves. Complete recovery of the ability to rapidly produced force may require more than 48h in many athletes. Individual responses should therefore be monitored to help plan acute and chronic training loads. It is recommended that future fatigue studies should incorporate temporal phase analyses to consider the power-, force-, velocity-, and displacement-time curves.
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