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No study cited here shows that a hot bath by itself lowers blood pressure more than a 30-minute workout. The study behind that comparison tested hot-water immersion after exercise against cooler immersion after the same exercise. Other studies found mixed results, so the evidence does not show that baths can replace exercise, medication, or clinician-directed hypertension care.
What the headline’s study actually compared
A 2025 study in The Journal of Physiology enrolled physically inactive middle-aged adults. Participants completed 30 minutes of moderate-intensity aerobic exercise, then immersed themselves in either 40°C water or 34°C thermoneutral water. They did this, on average, three times a week for eight weeks. The comparison was therefore exercise plus hot immersion versus the same exercise plus thermoneutral immersion—not a bath versus a workout. Read the study.
The hot-water group had greater reductions in diastolic and mean arterial pressure, and improved brachial artery flow-mediated dilation, a measure of blood-vessel function. The researchers did not find additional improvements in cardiorespiratory fitness, glucose, lipids, or inflammatory markers from adding hot immersion. These results suggest a possible added effect of heat after exercise in this group and protocol; they do not establish that bathing alone has the same effect.
What other blood-pressure studies found
Short-term immersion in people taking hypertension medication
A 2025 randomized crossover study involved 16 people with hypertension who were taking at least one antihypertensive medication. Participants completed separate sessions: 20 minutes in 40°C water, 40 minutes in 40°C water, 40 minutes in 36.5°C water, and seated control. Compared with control, reported 24-hour systolic blood pressure was 7 mm Hg lower after the 40-minute hot-water session and 6 mm Hg lower after both the 20-minute hot-water session and the 40-minute thermoneutral session. This was an acute result in a small, selected group, not evidence that immersion replaces treatment. Read the study.
#1 Best Overall
- Clinically Accurate: Easy Operation by two buttons, Advanced Accuracy, No Calibration required.
- Large Multi-Color Backlit Display: The large, oversized numbers make reading the results from this upper arm blood pressure monitoring device a breeze. Coded (GREEN/YELLOW/RED) display tells if your blood pressure readings are optimal or not.
- Easy Management: Manage and track up to 99 readings on your blood pressure monitor and unlimited readings on your smartphone with iHealth's free iOS and Android applications ( iOS 12.0 or later. Android 9.0 or later.Requires Bluetooth 4.0.and up).
- Heart Rhythm Disturbances: This unit automatically identifies and alerts you to any heart rhythm disturbances. If detected, a warning symbol will be displayed after the measurement is taken.
- What You Get: 1 x blood pressure monitor that meets ESH 2010 performance standards, 4 AAA batteries, 1 wide range cuff that fits upper arms with Circumference of 8.7"-16.5" (22-42cm),1 Instruction manual, our worry-free 12-month warranty and friendly California-based customer service.
Heat therapy versus exercise in untreated hypertension
A separate 2025 randomized clinical trial tested 30 supervised sessions of heat therapy or aerobic exercise in adults with untreated hypertension. It reported no blood-pressure effect from either intervention; the available study record does not give a numeric between-group estimate. This finding is a reminder that passive heat has not shown a reliable blood-pressure effect across populations and protocols. Read the study.
How to interpret the findings
These studies answer different questions. One tested repeated hot immersion after exercise in physically inactive adults and measured diastolic and mean arterial pressure. Another tested single immersion sessions in people taking medication and reported 24-hour systolic pressure. The third compared repeated heat therapy and exercise in untreated hypertension and reported no effect on blood pressure. Their results cannot be combined into a single claim that a bath lowers blood pressure more than exercise.
Rank #2
- One-Button Design: This Oklar blood pressure monitor features a one-button operation, making measurement easy and convenient; with just a touch, you can quickly take a measurement and get an accurate reading
- Large LED Display: The backlit LED screen with clear digits makes it easy for anyone to read quickly; you can get readings within 1 minute, and it's user-friendly for the elderly
- Stores Up to 240 Readings: Supports two users, storing 120 readings per user; this feature makes it easy to track and monitor blood pressure trends for you and your family over time
- Convenient Dual Power Supply: Allows to operate by using either 3AA batteries or a Type-C interface (Notice: Use the provided Type-C cable if no batteries are installed; This product is not rechargeable) ; its compact size and dual supply capabilities ensure it's ready for use at home or on the go
- Adjustable Arm Cuff: The arm cuff range from 8.7 - 15.7 inches (22-40 cm) fits your size, ensuring a comfortable and secure fit for most adults
In particular, the studies do not establish a bath-alone comparison with a 30-minute workout, a lasting benefit from regular bathing, or a replacement for prescribed medication or clinician-directed care. Anyone managing high blood pressure should follow their clinician’s advice rather than changing treatment based on these findings.
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Best Value
- CONFIDENCE IN EVERY READING: The OMRON Iron Upper Arm Blood Pressure Monitor's Advanced Accuracy Technology helps you monitor your heart health
- SAFEGUARD YOUR HEART: OMRON's Irregular Heart Beat Detection identifies heartbeat irregularities during routine blood pressure measurements, helping you and your doctor determine if treatment or further evaluation is needed
- START YOUR DAY WITH CONFIDENCE: Count on quick and accurate readings with simple one-touch operation; Just press one button; Regular monitoring can reveal irregular fluctuations before they lead to serious complications
- MORE ACCURATE RESULTS: Body Movement Detection alerts help enhance the accuracy of your blood pressure readings
- READY OUT OF THE BOX: Includes everything you need for your blood pressure kit; OMRON monitor, wide-range D-ring blood pressure cuff (fits arms 9"-17"), instruction manual, and quick start guide
Rank #4
- Quick & Accurate Readings: Get reliable blood pressure measurements in under a minute with one-touch operation, perfect for easy daily monitoring
- Large LCD Display & Dual User Mode: Features a clear, easy-to-read screen; Store and track readings separately for two users (120 memories each), suitable for family use
- Adjustable Wide-Range Cuff: The comfortable cuff fits arms 22-40cm (8.7"-15.7")
- Clear Time Display: Automatically records time and date with each reading for easy trend tracking
- Convenient Power & Complete Kit: Use the included Type-C power cable or 3xAA batteries (not included); Comes ready with cuff, storage bag, power cord, quick guide, and manual
Rank #3
- CONFIDENCE IN EVERY READING: Monitor your heart health with the OMRON Bronze Upper Arm Blood Pressure Monitor's Advanced Accuracy Technology; Store up to 14 readings to track your progress
- SAFEGUARD YOUR HEART: Detect heartbeat irregularities during routine blood pressure measurements with OMRON's Irregular Heart Beat Detection, helping you and your doctor determine if treatment or further evaluation is needed
- START YOUR DAY WITH CONFIDENCE: Know when your blood pressure is elevated with Hypertension Indicator alerts; Regular monitoring can reveal irregular fluctuations before they lead to serious complications
- TURN NUMBERS INTO INSIGHTS: Connect effortlessly to the free OMRON connect app via Bluetooth to store unlimited blood pressure readings, track trends, and share reports with your doctor; Compatible with Apple Health and Google Fit
- READY OUT OF THE BOX: Includes everything you need to start monitoring your heart health; OMRON monitor, wide-range D-ring blood pressure cuff (fits arms 9"– 17"), storage case, instruction manual, quick start guide, and four AA batteries
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