Key result
Exposure to a hyperthermic environment significantly decreased resting mean arterial pressure and increased total vascular conductance in college basketball players compared to a normothermic environment.
Why the study?
Does a hyperthermic environment alter the cardiovascular and metaboreceptor responses to static handgrip exercise and post-exercise muscle ischemia in healthy college basketball players compared to a normothermic environment?
Does a hyperthermic environment alter the cardiovascular and metaboreceptor responses to static handgrip exercise and post-exercise muscle ischemia in healthy college basketball players compared to a normothermic environment?
Absolute Event Rate: 79% vs 83%
p-value: p=<0.05
In well-trained college basketball players, a hyperthermic environment blunts the expected blood pressure increase during metaboreceptor stimulation due to uncompensated peripheral vasodilation.
Hyperthermia may lower resting BP via increased conductance in athletes; leaves open metaboreflex effects during ischemic exercise.
The objective of this study is to review physiological differences of college basketball players cardiovascular responses and group IV metaboreceptor interactions appearing post muscular ischemia exercise (PEMI) caused by a static handgrip exercise (SHE). The subjects were placed in a temperature and moisture stabilized indoor environment for 2 h in order to measure blood pressure. For the SHE, maximal voluntary contraction of arms with a relative strength of 50 % of the maximum muscular strength was put into isometric training for 2 min. After completing the exercises, cuffs worn on the arms of the subjects were pressurized up to 200 mmHg by applying PEMI to block the artery and vein. In this way, the cardiovascular responses created by SHE and PEMI were measured. Blood samples of subjects were collected from the vein of each upper arm before SHE and after PEMI to measure the metabolite hormone and catecholamine in the blood. Results from the measurements showed a significant decrease of blood pressure under high temperature environments compared to normal temperature environments. With respect to PEMI, increases in blood pressure under the high temperature environment were significantly lower compared to the normal temperature environment. In conclusion, this study revealed that college basketball players with good physical strength had higher sensitivities of arterial baroreceptor. However, blood pressure was not increased accordingly because the increase of cutaneous vasoconstriction due to stimuli of the metaboreceptor under a high temperature environment could not be compensated by arterial baroreflex due to the increase of total vascular conductance.
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Kim et al. (2016) studied Healthy college basketball players (n=20). Hyperthermic environment (35 °C, 50% relative humidity) vs. Normothermic environment (22-23 °C, 50% relative humidity) was evaluated on Resting mean arterial pressure (MAP) (p=<0.05). Exposure to a hyperthermic environment significantly decreased resting mean arterial pressure and increased total vascular conductance in college basketball players compared to a normothermic environment.
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