Clinical Trial: Resistance Exercise Modify Cardiovascular Responses of Professors During Teaching and Sleep

Study Status: Completed
Recruit Status: Completed
Study Type: Interventional

Official Title: Resistance Exercise Modify Cardiovascular Responses of Professors During Teaching and Sleep

Brief Summary: Both work activity and reduced nocturnal dipping of blood pressure are related to increased cardiovascular risk. The aim of the present study was to assess the hemodynamic and autonomic responses of university professors during teaching and sleeping times after different resistance exercise intensities. Ten normotensive professors (33.6±3.4 years, 82.4±12.4 kg; 177.0±7.5 cm) randomly underwent control and resistance exercise before initiating their daily activities. Resistance exercise consisted of a circuit training lasting 40min at 40% and 80% of one repetition maximum test. Systolic blood pressure and diastolic blood pressure as well as heart rate variability indicators in the time and frequency domains (Low Frequency, High Frequency, Low Frequency:High Frequency ratio) were evaluated on resting and 24 hours after the sessions. The average day-time, night-time and nocturnal blood pressure fall of systolic blood pressure and diastolic blood pressure were calculated.

Detailed Summary:

Experimental Procedure To test the hypothesis of the present study, after the evaluation of anthropometric characteristics, an interview covering medical history and habits of daily living and a strength assessment using the one maximum repetition test, consisting of another three distinct experimental sessions for a period of seven days each and always at the same time of the day and in random order, were applied to university professors. The interventions during each experimental session consisted of resistance exercise with intensities of 40% one maximum repetition (low intensity), 80% one maximum repetition (high intensity) and control without exercise. Before and 24 hours after the different interventions, with emphasis on the teaching and sleeping hours of the university professors, the hemodynamic and cardiac autonomic responses were examined.

Experimental Sessions The participants were told to avoid the intake of alcohol and caffeine in the 24 hours prior to the experimental sessions. In addition, for this same period, the participants were asked to not perform moderate or vigorous physical activity. The experimental sessions were performed in random order and were separated by a period of seven days each, from 9 to 10 am. All sessions were performed on days the professor taught class, which occurred during the university's night period, between 7 and 10 pm. In the three experimental sessions, the professor taught the same class and the same subject.

Pre-intervention: Before each intervention, the individuals remained seated in the laboratory for a period of 20 minutes in a quiet room without interference from noise and with a room temperature between 22-24ºC. During this period, every 5 minutes, blood pressure measurements were obtained, and the R-R intervals (the elapsed time between two consecutive R waves
Sponsor: Universidade Federal do vale do São Francisco

Current Primary Outcome: Blood pressure response to resistance exercise of different intensities during teaching period. [ Time Frame: 24 hours ]

Original Primary Outcome: Same as current

Current Secondary Outcome: Blood pressure response to resistance exercise of different intensities during sleep period. [ Time Frame: 6 hours ]

Original Secondary Outcome: Same as current

Information By: Universidade Federal do vale do São Francisco

Dates:
Date Received: December 31, 2015
Date Started: July 2013
Date Completion:
Last Updated: January 6, 2016
Last Verified: January 2016