Capsaicin supplementation increases time to exhaustion in high-intensity intermittent exercise without modifying metabolic responses in physically active men

Made available in DSpace on 2019-10-06T15:32:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-04-09 Purpose: The purpose of this study was to investigate the acute effect of capsaicin supplementation on performance and physiological responses during high-intensity intermittent exercise (HIIE). Method: Thirteen physically active men (age = 24.4 ± 4.0 years; height = 176.4 ± 6.9 cm; body mass = 78.7 ± 13.8 kg; running training per week = 3.9 ± 0.9 h) performed an incremental running test to determine peak oxygen uptake (V˙ O 2Peak ) and the speed associated with V˙ O 2Peak (sV˙ O 2Peak ). Thereafter, subjects completed two randomized, double-blind HIIE (15s:15 s at 120% sV˙ O 2Peak ) trials 45-min after consuming capsaicin (12 mg) or an isocaloric placebo. Time to exhaustion, blood lactate concentration, oxygen consumption during and 20 min post-exercise, energy expenditure, time spent above 90% of V˙ O 2Peak , and the rate of perceived exertion were evaluated. Results: There was no difference between capsaicin and placebo for any variable except time to exhaustion [capsaicin: 1530 ± 515 s (102 efforts) vs placebo: 1342 ± 446 s (89 efforts); p < 0.001]. Conclusion: In conclusion, capsaicin supplementation increased time to exhaustion in high-intensity intermittent exercise without modifying the metabolic response of exercise or the rate of perceived exertion in physically active men. Capsaicin could be used to increase the training load during specific exercise training sessions. Skeletal Muscle Assessment Laboratory (LABSIM) Department of Physical Education School of Technology and Sciences São Paulo State University (UNESP) Department of Kinesiology Laval University Department of Sport School of Physical Education and Sport University of São Paulo Immunometabolism of Skeletal Muscle and Exercise Research Group Federal University of Piauí (UFPI) University São Judas Tadeu Exercise and Immunometabolism Research Group Department of Physical Education São Paulo State University (UNESP) Department of Nutrition University of Western São Paulo (UNOESTE) Skeletal Muscle Assessment Laboratory (LABSIM) Department of Physical Education School of Technology and Sciences São Paulo State University (UNESP) Exercise and Immunometabolism Research Group Department of Physical Education São Paulo State University (UNESP)