To examine the impact of polyphenol supplementation on the recruitment, mobilization, and activation of monocyte subsets after resistance exercise.
Thirty-eight recreationally active males (22.1 ± 3.1 yr; 173.9 ± 7.9 cm; 77.8 ± 14.5 kg) were assigned to 28 d of polyphenol blend (PPB) supplementation, placebo (PL), or control (CON). Blood samples were obtained before (PRE) postresistance exercise, immediately (IP) postresistance exercise, 1 h (1H) postresistance exercise, 5 h (5H) postresistance exercise, 24 h (24H) postresistance exercise, and 48 h (48H) postresistance exercise (PPB/PL) or rest (CON). Fine-needle biopsies were obtained from the vastus lateralis at PRE, 1H, 5H, and 48H. Circulating concentrations of macrophage chemoattractant protein-1 (MCP-1) and fractalkine, as well as intramuscular MCP-1 were analyzed via multiplex assay. Changes in the proportions and expression of CD11b on monocyte subsets were assessed via flow cytometry.
Circulating MCP-1 increased in PPB and PL at IP with further increases at 5H. Intramuscular MCP-1 was increased at 1H, 5H, and 48H in all groups. Classical monocyte proportions were reduced in PPB and PL at IP, and increased at 1H. Nonclassical monocytes were increased in PPB and PL at IP, whereas intermediate monocytes were increased at IP, and reduced at 1H. Intermediate monocytes were increased in PPB at 24H and 48H. CD11b expression was reduced on PPB compared with PL and CON at PRE on intermediate and nonclassical monocytes.
Resistance exercise may elicit selective mobilization of intermediate monocytes at 24H and 48H, which may be mediated by tissue damage. Additionally, polyphenol supplementation may suppress CD11b expression on monocyte subsets at rest.
1Department of Exercise Physiology, Kent State University, Kent, OH;
2Exercise and Nutrition Science, Lipscomb University, Nashville, TN;
3Department of Exercise Science, Bloomsburg University, Bloomsburg, PA;
4Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, FL;
5Kemin Foods, L.C., Des Moines, IA; and
6Pediatric Exercise and Genomics Research Center (PERC), University of California-Irvine, Irvine, CA
Address for correspondence: Adam R. Jajtner, Ph.D., Department of Exercise Physiology, Kent State University, 350 Midway Dr.; Kent, OH 44242; E-mail: firstname.lastname@example.org.
Submitted for publication February 2018.
Accepted for publication June 2018.