Abstract
PURPOSE: Researchers have demonstrated that submaximal swimming (SMS) can reduce peak blood lactate concentrations ([BLA-]) to near baseline levels. H-wave® is a trans cutaneous electrical stimulator used to reduce peripheral edema by inducing low intensity muscle contractions; this may be used as an alternative recovery mode. The purpose of this study was to evaluate the effect of recovery mode on lactate removal. METHODS: Thirty competitive swimmers (males, n=19; females, n=11) with a mean age of 17.7±2.9 y, height of 1.8±0.1 m, and weight of 67.4±10.7 kg volunteered for the study; mean sprint times were 109.95±4.02 s and 121.60±3.94 s for males and females, respectively. Participants swam a 1,200 – 1,500 yd warm-up, sprinted a 200 yd frontcrawl, and completed a 20 min randomized-counterbalanced recovery. Recovery modes were denned as follows: SMS (8x100 yd repeats at 65% of 200 yd maximum speed); H-wave® (30 mA, 2 Hz; latissimus dorsi and rectus femoris); and, rest (seated). Lactate samples were denned as follows: peak (3 min post-sprint), mid-recovery (10 min into recovery), and post-recovery (following the final 10 min). RESULTS: Resultant blood lactates (mmol/L) were as follows (peak, mid-recovery, and post-recovery, respectively): SMS, 5.96±2.35, 3.50±1.57, and 1.60±0.57;H-wave®, 6.25±1.99, 4.46±1.79, and 3.12±1.41; rest, 6.32±2.17, 5.19±1.93, and 4.11 ±1.35. A repeated measures 3x3 (recovery mode × time) ANOVA revealed a significant interaction which was followed up by a Scheffe post hoc test to identify the source of the interaction. Submaximal swim recovery resulted in [BLA-] significantly lower (p<0.05) than rest at mid-recovery, and [BLA-] significantly lower (p<0.05) than both H-wave® and rest at post-recovery. H-wave® lead to a significantly lower (p<0.05) [BLA-] than rest at post-recovery. CONCLUSION: It appears that both recovery treatments, SMS and H-wave®, remove BLA- faster than rest recovery, with SMS proving to be the most effective
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