Zachary McKenna1, Jonathan Houck2,3, Jeremy Ducharme2, Zidong Li4, Quint Berkemeier2, Zachary Fennel2, Andrew Wells2,5, Christine Mermier2, Michael Deyhle2, Orlando Laitano6, Fabiano Amorim2. 1. Department of Health, Exercise and Sports Sciences, University of New Mexico, Albuquerque, NM, USA. zmckenna@unm.edu. 2. Department of Health, Exercise and Sports Sciences, University of New Mexico, Albuquerque, NM, USA. 3. Department of Science, Husson University, Bangor, ME, USA. 4. Department of Molecular Biology and Chemistry, Christopher Newport University, Newport News, VA, USA. 5. Department of Health and Exercise, Wake Forest University, Winston-Salem, NC, USA. 6. Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA.
Abstract
PURPOSE: The purpose of this study was to determine the effect of prolonged high-intensity interval (INT) and moderate-intensity continuous (CONT) treadmill exercise in the heat on markers of enterocyte injury and bacterial endotoxin translocation. METHODS: Nine males completed 2 h of work-matched exercise in the heat (40 °C and 15% RH) as either INT (2 min at 80% VO2max and 3 min at 30% VO2max) or CONT (~ 50% of VO2max). Blood samples collected pre- and post-exercise were assayed for intestinal fatty acid-binding protein (I-FABP), claudin-3 (CLDN-3), and lipopolysaccharide-binding protein (LBP). RESULTS: I-FABP was significantly increased from pre- to post-exercise in CONT (913.96 ± 625.13 to 1477.26 ± 760.99 pg•mL-1; p = 0.014, d = 0.766) and INT (714.59 ± 470.27 to 1547.93 ± 760.99 pg•mL-1; p = 0.001, d = 1.160). Pre- to post-exercise changes in I-FABP were not different between CONT and INT (p = 0.088, d = 0.414). LBP was significantly increased from pre- to post-exercise in INT (15.94 ± 2.90 to 17.35 ± 3.26 μg•mL-1; p = 0.028, d = 0.459) but not CONT (18.11 ± 5.35 to 16.93 ± 5.39 μg•mL-1; p = 0.070, d = 0.226), and pre- to post-exercise changes in LBP were higher in the INT compared to CONT (p < 0.001, d = 1.160). No significant changes were detected from pre- to post-exercise for CLDN-3 in CONT (14.90 ± 2.21 to 15.30 ± 3.07 μg•mL-1) or INT (15.55 ± 1.63 to 16.41 ± 2.11 μg•mL-1) (p > 0.05). CONCLUSIONS: We conclude that prolonged exercise in the heat induces enterocyte injury, but interval (or intermittent) exercise may cause greater bacterial endotoxin translocation which may increase the risk for local and systemic inflammation.
PURPOSE: The purpose of this study was to determine the effect of prolonged high-intensity interval (INT) and moderate-intensity continuous (CONT) treadmill exercise in the heat on markers of enterocyte injury and bacterial endotoxin translocation. METHODS: Nine males completed 2 h of work-matched exercise in the heat (40 °C and 15% RH) as either INT (2 min at 80% VO2max and 3 min at 30% VO2max) or CONT (~ 50% of VO2max). Blood samples collected pre- and post-exercise were assayed for intestinal fatty acid-binding protein (I-FABP), claudin-3 (CLDN-3), and lipopolysaccharide-binding protein (LBP). RESULTS: I-FABP was significantly increased from pre- to post-exercise in CONT (913.96 ± 625.13 to 1477.26 ± 760.99 pg•mL-1; p = 0.014, d = 0.766) and INT (714.59 ± 470.27 to 1547.93 ± 760.99 pg•mL-1; p = 0.001, d = 1.160). Pre- to post-exercise changes in I-FABP were not different between CONT and INT (p = 0.088, d = 0.414). LBP was significantly increased from pre- to post-exercise in INT (15.94 ± 2.90 to 17.35 ± 3.26 μg•mL-1; p = 0.028, d = 0.459) but not CONT (18.11 ± 5.35 to 16.93 ± 5.39 μg•mL-1; p = 0.070, d = 0.226), and pre- to post-exercise changes in LBP were higher in the INT compared to CONT (p < 0.001, d = 1.160). No significant changes were detected from pre- to post-exercise for CLDN-3 in CONT (14.90 ± 2.21 to 15.30 ± 3.07 μg•mL-1) or INT (15.55 ± 1.63 to 16.41 ± 2.11 μg•mL-1) (p > 0.05). CONCLUSIONS: We conclude that prolonged exercise in the heat induces enterocyte injury, but interval (or intermittent) exercise may cause greater bacterial endotoxin translocation which may increase the risk for local and systemic inflammation.
Authors: Joanne L Fallowfield; Simon K Delves; Neil E Hill; Susan A Lanham-New; Anneliese M Shaw; Pieter E H Brown; Conor Bentley; Duncan R Wilson; Adrian J Allsopp Journal: Br J Nutr Date: 2019-02 Impact factor: 3.718