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Open AccessArticle

Lactate, Heart Rate and Rating of Perceived Exertion Responses to Shorter and Longer Duration CrossFit® Training Sessions

1
Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, 78000 Cuiabá (MT), Brazil
2
Laboratory of Exercise Physiology, Faculty Estacio of Vitoria, 29010 Vitoria (ES), Brazil
3
Graduate Program of Physical Education, Catholic University of Brasilia, 04534 Brasilia (DF), Brazil
*
Author to whom correspondence should be addressed.
J. Funct. Morphol. Kinesiol. 2018, 3(4), 60; https://doi.org/10.3390/jfmk3040060
Received: 4 November 2018 / Revised: 25 November 2018 / Accepted: 26 November 2018 / Published: 28 November 2018
(This article belongs to the Section Athletic Training and Human Performance)
The aim of this study was to analyze blood lactate concentration (LAC), heart rate (HR), and rating perceived exertion (RPE) during and after shorter and longer duration CrossFit® sessions. Nine men (27.7 ± 3.2 years; 11.3 ± 4.6% body fat percentage and training experience: 41.1 ± 19.6 months) randomly performed two CrossFit® sessions (shorter: ~4 min and longer: 17 min) with a 7-day interval between them. The response of LAC and HR were measured pre, during, immediately after, and 10, 20, and 30 min after the sessions. RPE was measured pre and immediately after sessions. Lactate levels were higher during the recovery of the shorter session as compared with the longer session (shorter: 15.9 ± 2.2 mmol/L/min, longer: 12.6 ± 2.6 mmol/L/min; p = 0.019). There were no significant differences between protocols on HR during (shorter: 176 ± 6 bpm or 91 ± 4% HRmax, longer: 174 ± 3 bpm or 90 ± 3% HRmax, p = 0.387). The LAC was significantly higher throughout the recovery period for both training sessions as compared to pre-exercise. The RPE was increased immediately after both sessions as compared to pre-exercise, while there was no significant difference between them (shorter: 8.7 ± 0.9, longer: 9.6 ± 0.5; p = 0.360). These results demonstrated that both shorter and longer sessions induced elevated cardiovascular responses which met the recommendations for gains in cardiovascular fitness. In addition, both training sessions had a high metabolic and perceptual response, which may not be suitable if performed on consecutive days. View Full-Text
Keywords: extreme conditioning training; metabolic stress; cardiovascular response; high intensity functional training extreme conditioning training; metabolic stress; cardiovascular response; high intensity functional training
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Tibana, R.A.; De Sousa, N.M.F.; Prestes, J.; Voltarelli, F.A. Lactate, Heart Rate and Rating of Perceived Exertion Responses to Shorter and Longer Duration CrossFit® Training Sessions. J. Funct. Morphol. Kinesiol. 2018, 3, 60.

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