Effects of Creatine Supplementation on Lower-Limb Muscle Endurance Following an Acute Bout of Aerobic Exercise in Young Men

• Main Authors: Itamar P. Vieira, Amanda G. de Paula, Paulo Gentil, Claude Pichard, Darren G. Candow, Gustavo D. Pimentel
• Format: Article
• Language: English
• Published: MDPI AG 2020-01-01
• Series: Sports
• Subjects: creatine; aerobic exercise; concurrent exercise; strength loss; muscle
• Online Access: https://www.mdpi.com/2075-4663/8/2/12

We aimed to determine whether creatine supplementation influences lower-limb muscle endurance following an acute bout of aerobic exercise (AE) in young healthy men. Using a randomized, double-blind, placebo-controlled crossover design, 11 men (26.5 &#177; 6.2 years, body mass index 26.6 &#177; 2.1 kg/m²),with 12 months of experience in strength training (three times/week) and AE (two times/week) were randomized to receive creatine (20 g/day plus 20 g/day maltodextrin) and placebo (40 g/day maltodextrin) for 7 days, separated by a washout period of 14 days, before performing an acute bout of AE (30 min on treadmill at 80% baseline maximum velocity) which was followed by four sets of bilateral leg extension endurance exercise using a 10-repetition maximum protocol (10 RM)). There was a significant decrease in the number of repetitions performed in the third (Placebo: &#8722;20% vs. Creatine: &#8722;22%) and fourth set (Placebo: &#8722;22% vs. Creatine: &#8722;28%) compared with the first set (<i>p</i> &lt; 0.05), with no differences between creatine and placebo. Additionally, no differences were observed between creatine and placebo for the total number of repetitions performed across all four sets (Placebo: 33.9 &#177; 7.0 vs. Creatine: 34.0 &#177; 6.9 repetitions, <i>p</i> = 0.97), nor for total work volume (Placebo: 3030.5 &#177; 1068.2 vs. Creatine: 3039.8 &#177; 1087.7 kg, <i>p</i> = 0.98). Short-term creatine supplementation has no effect on lower-limb muscle endurance following an acute bout of aerobic exercise in trained young men.