Comparison of Acute Sauna With Exercise and Sauna

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

72 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-08-01

Study Completion Date

2018-12-01

Brief Summary

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Sauna bathing has been associated with a lower risk for cardiovascular disease (CVD) outcomes, improved vascular endothelial and cardiac function, reduced oxidative stress and lower blood pressure. Earlier studies conducted by the investigators have showed positive alterations of arterial stiffness and hemodynamics through sauna bathing.

Some studies have sought to utilize sauna bathing as an intervention after exercise with promising and synergistic results, although the effects on populations with cardiovascular risk factors are less clear. Furthermore, studies investigating the use of both exercise and sauna bathing in combination has been somewhat limited. However, results from some studies speculate that adjunctive exercise and sauna interventions may be useful for aging and clinical patient population groups.

Given that heat therapy and sauna use is gaining more worldwide popularity, the investigators sought to compare the acute hemodynamic effects between sauna use alone and a short bout of exercise followed by sauna exposure. It was hypothesize that the combination of exercise and sauna will elicit greater changes than sauna alone. To achieve this, we standardized the protocol duration (30 minutes).

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Detailed Description

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In this crossover trial, all study participants underwent two interventions, each on a separate occasion (\>72 hours apart). A standalone 30-minute sauna at 75°C (S), and 15-minutes of cycling on the stationary bike at 75% maximum heart rate, followed by 15-minutes of sauna exposure (ES). A cycling exercise test was conducted on a separate day prior to the experiment to ascertain individual maximal exercise heart rates, which was then used to calculate individual 75% maximum.

After the ﬁrst 15-minute period of S, the participants left the sauna room to have a quick shower (\<30 seconds) before going back for the second 15-minute period. The same sauna bathing room (75°C) was used for all participants and the cycling exercise was conducted within 10 meters of the sauna room to minimize transit time during ES. Participants were instructed to abstain from eating 2h, caffeine 12h and alcohol 24h prior to the measurements. Food intake was not standardized. Fluid was consumed ad libitum. A medical physician was in attendance at all times and participants were allowed to leave the sauna or stop the experiment at any time if they felt uncomfortable.

Brachial blood pressures and pulse wave velocity (PWV) as a measure of arterial stiffness, were taken in their respective order at three different time points; before (PRE), immediately after (POST), and after a 30-minute recovery (POST30). Transit time from the cessation of the intervention to POST measurements were kept under 60 seconds. All measurements were performed by the same assessor to minimize ascertainment biases.

Participants were permitted to take a quick shower (\<30 seconds) before POST measurements were taken. Water temperature or the shower was not controlled and participants could freely select their desired temperature. Thereafter, they were instructed to rest in a designated waiting lounge (mean temperature 21°C) in a seated position for a duration of 30-minutes before the last measurement (POST30) was taken.

Conditions

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Cardiovascular Risk Factor Blood Pressure Arterial Stiffness

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

NONE

Study Groups

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Sauna alone

Sauna exposure for 30 minutes

Group Type ACTIVE_COMPARATOR

Sauna bathing

Intervention Type OTHER

Passive heat exposure

Exercise and Sauna

Cycling exercise for 15 minutes followed by sauna for 15 minutes

Group Type EXPERIMENTAL

Aerobic exercise

Intervention Type OTHER

15 minutes of aerobic exercise using stationary bicycle

Sauna bathing

Intervention Type OTHER

Passive heat exposure

Interventions

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Aerobic exercise

15 minutes of aerobic exercise using stationary bicycle

Intervention Type OTHER

Sauna bathing

Passive heat exposure

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Free of a prior diagnosis of CVD, exhibits at least one of the following cardiovascular risk factors: a history of smoking, hyperlipidemia, hypertension, diabetes, obesity, or family history of coronary heart disease (CHD).

Exclusion Criteria

* recent musculoskeletal injuries or surgery (less than 6 months ago), mental illnesses, under 30 years of age or over 75 at time of recruitment, health conditions that may contraindicate study parameters.

Minimum Eligible Age

30 Years

Maximum Eligible Age

75 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No