Browsing by Author "Pussieldi, Guilherme de Azambuja"
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- Assessment of heart rate variability and infrared thermography in response to exercise-induced muscle damagePublication . Marques, Wanessa Karoline Brito; Santana, Paulo Vitor Albuquerque; Oliveira, Vinícius Fernandes Ferreira de; Pussieldi, Guilherme de Azambuja; Leite, Luciano Bernardes; Forte, Pedro; Assis, Miller Gomes; Pimenta, Eduardo Mendonça; Mostarda, Cristiano Teixeira; Costa, Herikson Araújo; Dibai-Filho, Almir Vieira; Oliveira Junior, Mario Norberto Sevilio; Cabido, Christian Emmanuel Torres; Veneroso, Christiano EduardoThe aim of this study is to investigate the behavior of autonomic nervous activation and infrared thermography (IR) after an eccentric exercise protocol. The sample consisted of ten physically active men (22.5 ± 3.3 years) who had not practiced plyometric training in the 6 months prior to the study. After a period of familiarization and assessment of body composition, the participants underwent a plyometric jumping protocol, including jumps over a 50 cm obstacle and jumps from a 50 cm box, after a 5-min warm-up on the treadmill. Subsequently, the following assessments were performed: assessments included measures of rating perceived fatigue (RPF), delayed-onset muscle soreness (DOMS), IRT and heart rate variability (HRV) performed at 24, 48 and 72 h after exercise. The RPF results showed a significant increase from baseline at 24 h, 48 h, and 72 h after the muscle damage protocol. For DOMS, significant increases were observed at 24 h, 48 h, and 72 h compared to baseline, with values notably higher at 24 h and 48 h than at 72 h. Thermographic assessments of the posterior thigh region showed a higher concentration of pixels in the warm zone at 48 h and 72 h compared to baseline, as well as at 48 h and 72 h compared to 24 h. Regarding HRV, the LF/HF ratio and %LF were elevated at 24 h and 48 h compared to baseline and 72 h, while %HF decreased at 24 h and 48 h relative to baseline. The exercise-induced stress increased warm-zone pixels and elevated sympathetic activity (LF/HF ratio and %LF) up to 48 h post-exercise. This was followed by a shift to increased parasympathetic modulation (higher %HF), indicating recovery. These findings underscore the utility of IRT and HRV in monitoring recovery and optimizing training.
- Thermal stress and physiological responses in Brazilian jiu-jitsu athletes submitted to simulated fights in a hot environmentPublication . Pereira, Diogo; Forte, Pedro; Leite, Luciano Bernardes; Ribeiro, Joana; Cachada, José M.; Bolani, Wladimir; Pussieldi, Guilherme de Azambuja; Rezende, Leonardo M.T.; Pimenta, Eduardo Mendonça; Cabido, Christian Emmanuel Torres; Oliveira Junior, Mario Norberto Sevilio; Mendes, Thiago Teixeira; Veneroso, Christiano EduardoAnalyze thermal stress and changes in physiological variables in simulated BJJ fights in a hot environment. The study included 12 male athletes, comprising 11 black belts and 1 brown belt. The athletes were divided into pairs according to their categories and there were four 10-minute bouts with 10 minutes of rest between bouts in a covered environment, during the night, with an ambient temperature (TA) of 29.3 ± 0.5ºC and relative air humidity (URA) of 75.9 ± 1.1%. The variables heart rate (HR), lactate, gastrointestinal temperature (Tgi) and skin temperature (Tskin), hand grip, dehydration rate, total sweating and specific urine density were evaluated. HR, lactate and Tgi data were collected before starting the simulated fights (pre 1, 2, 3 and 4), immediately after the end of each fight (post 1, 2, 3, and 4). All other variables were collected during the baseline period, which corresponds to pre 1, and in the post-fight assessments (post-fight 1, 2, 3, and 4). There was a significant reduction in body mass post-fight compared to pre-simulated fights (p < 0.001). Despite ad libitum hydration, athletes transitioned from a euhydrated state to significant-to-severe dehydration by the end of the protocol. HR values were significantly higher post-fight (post 1, 2, 3, 4) compared to rest (pre-1) (p < 0.001). Blood lactate levels increased post-fight (post 1, 2, 3, 4) compared to rest (pre-1). Tgi increased significantly after the first fight (post 1, 2, 3, 4) compared to rest (pre 1) (p < 0.001) and remained stable until the fourth fight. Tskin showed a increase post-fight (post 1, 2, 3) compared to rest (pre-1) (p < 0.001). Conclusions: The thermoregulatory mechanisms were sufficient to maintain thermal control during the simulated BJJ fights.