The Effect of Cool (19ºC) and Neutral (24ºC) Room RecoveryTemperature on Blood Pressure after Interval Exercise
Cardiff Metropolitan University
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The purpose of the present study was to examine whether blood pressure was influenced by a cool (19ºC) or a neutral (24ºC) recovery temperature after a bout of interval exercise. Participants were ten healthy active Cardiff Metropolitan University students (5 male) aged between 18 – 21 years. After a preliminary VO2 max test participants completed 4 bouts of 4 minutes of exercise at 85% VO2 max and 3 minutes at 50% VO2 max after which participants, in a randomised order, sat in a temperature controlled laboratory for one of the two temperature conditions (19°C and 24°C) for a recovery period of 60 minutes. Measurements of blood pressure, heart rate and body temperature were taken during recovery at ten minute intervals. Systolic blood pressure was found to decrease over the recovery time from baseline values with the cool condition showing larger differences, baseline 113.7 mmHg (± 10.4) to 109.05 (± 9.50) at 50 minutes, (p = 0.74). Diastolic blood pressure was significantly affected by temperature (p ≤ 0.02) as the cool condition had lower values from baseline and also over the 50 minute recovery period, with the largest difference at 10 minutes (6.1 mmHg). Heart rate was shown to decline over the 50 minute recovery period for both temperature conditions (cool: 99.2 (± 14.3) to 77.3 (± 11.4) beats/min, neutral: 97.1 (± 15.0) to 84.9 (± 11.2) beats/min. Further analysis showed heart rate at the fifty minute measurement in the cool condition was significantly lower (p ≤ 0.02) for both time and temperature. Body temperature measurements were higher than baseline but decreased over the recovery period, while time caused significant difference of (p ≤ 0.02). These results indicate that recovery in a cool temperature would likely to have beneficial effects on blood pressure, however, this results appears to contradict previous research.
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