Cardiorespiratory Fitness
Conditions
Interventions
This study is a two-arm, randomized, crossover, single-blind clinical trial. Participants will be randomized in a 1:1 ratio to one of the following experimental conditions: Sleep Restriction or Contro
Sponsors
Pronto Socorro Cardiologico de Pernambuco. Prof. Luiz Tavares - Procape
Universidade Federal de Pernambuco
Eligibility
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: The study will include participants who meet the following criteria: average sleep duration between 7 and 9 hours; regular street running practice for at least 6 months; performing a minimum of 150 minutes per week; absence of sleep irregularity (standard deviation of sleep duration lower than 90 minutes); absence of sleep disorders, no obesity (Body Mass Index lower than 30 kg/m²); not using medications that interfere with sleep; not pregnant; non-excessive caffeine consumption (lower than 400 mg/day); and not engaged in night shift work
Exclusion criteria
Exclusion criteria: If they fail to adhere to the sleep restriction protocol; fail to properly complete the restriction control form (more than 4 records per day for three consecutive days); show changes in stimulant consumption; engage in another form of physical exercise; or take naps during the protocol period
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Sleep restriction to four hours per night for seven consecutive days is expected to cause a sustained increase in blood pressure, with a mean elevation of 3.1 mmHg in systolic blood pressure and 2.2 mmHg in diastolic blood pressure, as measured by ambulatory blood pressure monitoring. | — |
Secondary
| Measure | Time frame |
|---|---|
| Sleep restriction to four hours per night for seven consecutive days is expected to cause a mean reduction of 7 mL·kg?¹·min?¹ in oxygen consumption, considering the difference between assessments performed before and after the intervention, measured through a maximal exercise test with cardiopulmonary exercise testing (ergospirometry).;Sleep restriction to four hours per night for seven consecutive days is expected to reduce vascular function by approximately 2.2%, as assessed by the flow-mediated dilation technique.;Sleep restriction to four hours per night for seven consecutive days is expected to increase sympathetic modulation by 9% and reduce parasympathetic modulation by approximately 9%, as verified by heart rate variability analysis.;Sleep restriction to four hours per night for seven consecutive days is expected to increase arterial stiffness, leading to an increase of 30 cm/s in pulse wave velocity. | — |
Countries
BR
Contacts
Public ContactOzeas Lins Filho
Universidade Federal de Pernambuco
Outcome results
None listed