RESUMO
OBJECTIVE: The purpose of this investigation was to evaluate the effects of foam rolling (FR) and passive recovery (PR) on symptoms of delayed-onset muscle soreness (DOMS) and military-specific performance. METHODS: Twenty men and women (age: 23.6 ± 4.1 years, height: 176.4 ± 5.6 cm, and body mass: 84.7 ± 13.4 kg) completed a DOMS-inducing exercise protocol (DIP), followed by FR or PR. Four loaded military tasks (LMT) were performed 24 h later. Rating of perceived exertion (RPE) was measured during DIP and after each LMT. Rating of muscle pain (RMP) was measured prior to the LMTs and after the recovery protocols. A repeated measure analysis of variance and partial eta squared were used to compare LMT performance across baseline, FR and PR sessions. Friedman tests compared perceptual variables across baseline, FR, and PR. Wilcoxon matched-pairs signed-ranks test evaluated RPE during DIP, post-DIP, and post-recovery RMP between FR and PR. RESULTS: LMT performance times were significantly faster after FR compared to PR (stair climb: p = .038, cover position sprint: p = .011, simulated ammunition can carry: p = .003, Shuttle Run: p = .034). RPE measured during LMTs was similar across all data points. Post-recovery RMP for FR (3.0 (2.3, 4.0)) and PR (4.0 (3.0, 6.0)) were not significantly different. CONCLUSION: FR reduced the impact of DOMS on three loaded tactical performance tasks without significant reduction in perceived soreness.
RESUMO
Sampling sites for determining lactate concentration [La(-)] have been debated for years. To date, none of the research that has been completed has taken into consideration the muscle group that is active during exercise, sample site, and the passivity of nonexercising muscle, collectively. The purpose of this study was to determine if this passive sink phenomenon could be visualized by using common sampling methods immediately after exercise and during the recovery period from 2 sample sites. Eleven male cyclists completed a subject-specific trial on a Velotron cycle ergometer. Plasma [La(-)] was measured from the finger and toe immediately postexercise and every 5 minutes after, for 25 minutes after the cycling trial. All 3 analyses were significant (p < 0.05) with the sample site × sample time interaction, sample time main effect, and sample site main effect being reported, respectively: Wilks' λ = 0.079, F (5,6) = 13.932, p = 0.003, Wilks' λ = 0.012, F (5,6) = 94.804, p = 0.000, and Wilks' λ = 0.492, F (1,10) = 10.316, p = 0.009. Post hoc paired t-tests on computed mean differences between sample sites for each sample time revealed statistically significant differences (p < 0.05) between several time intervals. Further analysis also revealed significant differences (p < 0.05) in the sample site main effect at each collection time. Blood lactate samples need to be obtained from the limb containing the exercising muscle(s) to negate the passive sink effect that has been observed to occur in nonexercising muscles. This recommendation needs to be followed to better establish future training volumes and outcomes.
