Morgan Maleske1, Macy Kate Bynum1, Annika Marie Pschorr1, Taylor Carrico1, Matthew Hermes1, & Brenda Reeves1

1Murray State University, Murray, Kentucky

Citrulline malate (CM) is a recognized supplement to improve performance due to its potential to enhance blood flow and nutrient delivery. Various studies have focused on the effect of CM on anaerobic performance in trained athletes with differing results in power output due to variations in methodology. The benefits of acute CM supplementation on high intensity aerobic/anaerobic performance in novice CrossFit® participants is unknown. PURPOSE: To examine the effects of acute CM vs. placebo (PL) supplementation on repeated-bout overhead squat (OH) performance in novice Nancy CrossFit® participants. METHODS: Eight recreationally trained males (X ± SD; age = 20.8 ± 2.3 yrs, height = 180.0 ± 6.0 cm, body fat 9.5 ± 5.1%, VO2max = 49.3 ± 6.4 ml/kg/min, 1RM = 59.5 ± 19.7 kg, MET.min = 701.2 ± 230.5) were randomized in a double-blind, crossover design. Participants completed two sessions of the Nancy separated by a 7-day washout period. In each session, participants consumed 4 oz of orange juice with either 8 g of CM or PL. After 60 min, participants completed the Nancy (5 bouts of a 400-meter run on a treadmill followed by 15 OH using a 20 kg barbell) as quickly as possible. Mean concentric power (MP) and mean concentric velocity (MV) in OH performance was measured with a linear position transducer. A 2x2 (condition x set) repeated measures ANOVA with Bonferroni adjustments was used to assess changes in MP and MV between the first and last set between conditions. An additional 2x2 repeated measures ANOVA (trial x set) was used to compare Nancy performance between the first and second sessions to test for a potential practice effect independent of supplementation. RESULTS: Two-way interactions between supplementation condition and set were not significant for MV (p = .63, = .04) or MP (p = .65, = .03). Main effects for condition and set were not different for MV (p = .28 - .54, = .06 - .16) or MP (p = .29 - .53, = .06 - .16). When collapsing across sets, MV (1.05 ± 18 vs. 101.1 ± 16 m/s) and MP (205.0 ± 35.8 vs. 198.5 ± 31.6 W) for CM and PL, respectively, were not different (p = .28 -.29, = .16). In addition, no practice effect was found between the first and second session for MV (p = .17 - .80, = .01 - .25) or MP (p = .16 - .83, = .07 - .26). CONCLUSION: These data suggest that acute CM supplementation before the Nancy did not improve OH performance.

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