Sweat rate measurements after high intensity interval training using body weight

Alexandre Fernandes Machado, Alexandre Lopes Evangelista, João Marcelo Q. Miranda, Cauê V. La Scala Teixeira, Gerson Leite, Roberta Luksevicius Rica, Aylton Figueira Junior, Julien Baker, Danilo S. Bocalini

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OBJECTIVES: When using different physical activity training regimes, high-intensity interval training has received considerable attention. However, the sweat rate variation using the HIIT method still needs to be evaluated. The objective of this study was to assess sweating and water loss during a HIIT body work session in healthy college students. 

MATERIALS AND METHODS: 20 male individuals (31 ± 07 years) were split into two groups: Active group (AG), weekly physical activity:  331 ±16 minutes) and Inactive group (IG, weekly physical activity: 100 ± 15 minutes).The HIIT body work protocol consisted of a single bout of exercise with a 1:1 work recovery stimuli. The exercise consisted of a 30 second maximal intensity bout. The following exercises were used during the exercise phase, jumping jack, mountain climb, burpee and squat jump exercises. All exercises were followed by 30 seconds of passive recovery and a total time of 20 minutes was required for both exercise and recovery periods. For comparison purposes, after 48 hours all the individuals were submitted to a continuous running protocol at an intensity corresponding to 75% of individual maximum cardiovascular frequency, for 40 minutes. The intensity of the session was monitored continuously, at 30 second periods, using the perception of effort scale, for both protocols. To guarantee the state of eu-hydration all individuals ingested 500 ml of water 120 minutes prior to the training sessions. To assess the sweating rate (SR, ml/min) the following equation was used: SR =  [(Initial weight – Final weight) x 1000] / total time of the physical activity. 

RESULTS: Significant differences (p= 0.01) in body mass were found after HIIT protocol when compared to Moderate session in both Active (HIIT: -0.60 ± 0.29 kg, Moderate: -0.26 ± 0.12 kg) and Inactive (HIIT: -0.92 ± 0.30 kg, Moderate: -0.26 ± 0.26 kg) groups. However, no differences were found between groups. The values of absolute sweating rate comparing moderate and HIIT single bout in Inactive (Moderate: 10.55 ± 10.59 ml/min; HIIT: 28.90 ± 13.88 ml/min) and Active (Moderate: 9.60 ± 4,52 ml/min; HIIT: 26.00 ± 15.06 ml/min) were different between modalities, but not between groups. 

CONCLUSIONS: The sweating rate is influenced by the intensity of the exercise, being higher after HIIT than after moderate exercise session. However, the sweating rate variation is not affected by the physical activity level of the subjects. 
Original languageEnglish
Pages (from-to)197-201
JournalRevista Brasileira de Medicina do Esporte
Issue number3
Publication statusPublished - 1 May 2018


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