Jason A. Campbell1, Rebecca D. Larson1, Christopher D. Black1, & Kellea N. McGuire1

1University of Oklahoma, Norman, Oklahoma

PURPOSE: The aims of this study were to determine the time-course for recovery in Army ROTC cadets following a bout of high-intensity exercise, if sex differences for recovery exist, & examine the use of a countermovement jump (CMJ) as a measure of fatigue & muscle damage. METHODS: 10 male (M) & 9 female (F) ROTC cadets performed high-intensity interval resistance (HIIR) exercise using their 10RM for 3 sets of 8 resistance exercises (Chest press, leg press, lat pull, etc.) w/60s work:60s rest. Soreness ratings (100mm VAS) & perceived recovery status (PRS) were recorded prior to performing 5 counter-movement jumps (CMJ). RPE (CR10 scale) was taken after each round. Immediately post-exercise, subjects performed 5 more CMJs. Thirty-minutes post exercise, subjects provided session RPE (sRPE). This protocol was used at baseline (BL), 24, 48 & 72 hrs post BL. RESULTS: For M & F subjects, exercise performance was similar with 24, 48, & 72 hrs of recovery & all were > than BL (385.3-419.8 vs. 331.9 reps). CMJ relative peak power was > in M vs. F at all time points (47.2 vs. 33.7 W/kg, respectively) & decreased from pre-to-post at BL only for both M & F cadets (1.1% vs. 1.8%, respectively). Percent change in CMJ performance from pre-to-post did not differ between genders at any time point. Soreness ratings were > at 24H (27.2) versus BL (7.5) and 72H (12.3). Upper body soreness ratings were > than lower body soreness for BL (7.5 c 6.2), 24H (24.3 v 15.1) & 48H (16.8 v 10.1). M & F did not differ in soreness ratings. PRS was moderately correlated (r = 0.484, 0.682, 0.503, 0.528)) with soreness ratings for BL, 24H, 48H, & 72H; sRPE did not differ between time points for all subjects (overall x̅ = 8.3). RPE increased from set 1 to set 3 (7.5 v 8.8, respectively). M & F did not differ in RPE for all sets. CONCLUSION: ROTC cadets could recover 24H following a bout of HIIR exercise with no differences between M & F cadets. CMJ performance did not match the change in exercise performance. Soreness patterns were similar for M & F cadets for high-intensity exercise. PRS matched the pattern of soreness indicating it is associated with soreness rather than performance. More work is needed to better understand the recovery capacity of ROTC cadets & the usefulness of CMJ monitoring. Lastly, this type of resistance exercise could be used to improve performance in entry-level ROTC cadets.

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