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Association between the increase in brain temperature and physical performance at different exercise intensities and protocols in a temperate environment BJMBR
Kunstetter,A.C.; Wanner,S.P.; Madeira,L.G.; Wilke,C.F.; Rodrigues,L.O.C.; Lima,N.R.V..
There is evidence that brain temperature (Tbrain) provides a more sensitive index than other core body temperatures in determining physical performance. However, no study has addressed whether the association between performance and increases in Tbrain in a temperate environment is dependent upon exercise intensity, and this was the primary aim of the present study. Adult male Wistar rats were subjected to constant exercise at three different speeds (18, 21, and 24 m/min) until the onset of volitional fatigue. Tbrain was continuously measured by a thermistor inserted through a brain guide cannula. Exercise induced a speed-dependent increase in Tbrain, with the fastest speed associated with a higher rate of Tbrain increase. Rats subjected to constant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brain cortex; Fatigue; Hyperthermia; Speed; Thermoregulation; Treadmill running..
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000800679
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Comparison of sweat rate during graded exercise and the local rate induced by pilocarpine BJMBR
Vimieiro-Gomes,A.C.; Magalhães,F.C.; Amorim,F.T.; Machado-Moreira,C.A.; Rosa,M.S.; Lima,N.R.V.; Rodrigues,L.O.C..
Centrally stimulated sweat rate produced by graded exercise until exhaustion was compared to the local sweat rate induced by pilocarpine, often used as a sweating index for healthy individuals. Nine young male volunteers (22 ± 4 years) were studied in temperate environment in two situations: at rest and during progressive exercise with 25 W increases every 2 min until exhaustion, on a cycle ergometer. In both situations, sweating was induced on the right forearm with 5 ml 0.5% pilocarpine hydrochloride applied by iontophoresis (1.5 mA, 5 min), with left forearm used as control. Local sweat rate was measured for 15 min at rest. During exercise, whole-body sweat rate was calculated from the body weight variation. Local sweat rate was measured from the time...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sweat rate; Graded exercise test; Pilocarpine; Thermoregulation.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000700017
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Heat storage rate and acute fatigue in rats BJMBR
Rodrigues,L.O.C.; Oliveira,A.; Lima,N.R.V.; Machado-Moreira,C.A..
Thermal environmental stress can anticipate acute fatigue during exercise at a fixed intensity (%VO2max). Controversy exists about whether this anticipation is caused by the absolute internal temperature (Tint, ºC), by the heat storage rate (HSR, cal/min) or by both mechanisms. The aim of the present study was to study acute fatigue (total exercise time, TET) during thermal stress by determining Tint and HSR from abdominal temperature. Thermal environmental stress was controlled in an environmental chamber and determined as wet bulb globe temperature (ºC), with three environmental temperatures being studied: cold (18ºC), thermoneutral (23.1ºC) or hot (29.4ºC). Six untrained male Wistar rats weighing 260-360 g were used. The animals were submitted to...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Thermoregulation; Exercise; Fatigue; Heat storage rate.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000100018
Registros recuperados: 3
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