If dieting by a calorie app has stopped working, your metabolic rate is probably not what the formula assumed. TELOMYX brings clinical-grade RMR testing to Evolution Fitness XL in St Helens, so you can measure exactly how many calories your body burns at rest instead of guessing. Full medical report within 48 hours.
From £110 per test
Metabolic cart precision · No GP referral needed · Full medical report within 48 hours
An RMR test on its own tells you exactly how many calories your body burns at rest, the true baseline that standard calorie calculators estimate and often get wrong by 200–400 kcal per day. Pairing it with a DEXA scan in the same session at Evolution Fitness XL adds your full body composition picture: fat mass, lean mass and visceral fat to medical precision. Most clients who book for nutrition or weight management combine both, because knowing your metabolic rate without knowing your body composition (or vice versa) gives you half an answer.
£210 · most popular
Pair your RMR with a DEXA scan in the same session. Your metabolic rate tells you how much to eat; your DEXA tells you exactly what your body is made of. Together they give you the full picture.
£110 · 20-min test · 48-hr report
The standalone RMR test. Measure exactly how many calories your body burns at rest, the true baseline every nutrition plan should start from.
Quick explainers covering how each test works, what it measures and who it is for.
How metabolic rate testing works, what it measures and who it is for. Read the full RMR guide →
The medical gold standard for body composition, visceral fat and bone density, often paired with RMR. Read the full DEXA guide →
Standard calorie calculators estimate your metabolic rate from population averages. For any individual they can be off by 200–400 kcal per day, enough to make the difference between losing weight and maintaining it, or between fuelling right for a training block and running on empty. Until TELOMYX, getting a properly calibrated RMR test meant leaving St Helens for a university sports-science lab or a specialist clinic in Liverpool or Manchester. We fixed that by bringing clinical metabolic cart testing directly to Evolution Fitness XL, West Park, with on-site parking and easy access from across the borough.
Every standard calorie calculator (Harris-Benedict, Mifflin-St Jeor, MyFitnessPal) uses population-average formulas. RMR testing measures your actual metabolic rate from your exhaled breath. For the same height and weight, individual RMR can vary by 400 kcal or more. We test at Evolution Fitness XL, West Park (WA10 3TF) — on-site parking, minutes from St Helens town centre, no drive across to Liverpool or Manchester.
Within 48 hours of your test, with your RMR result, estimated TDEE at multiple activity levels, respiratory exchange ratio and goal-specific interpretation.
Unlike DEXA, an RMR test requires no medical referral. Book a slot, follow the pre-test guidelines and turn up. No GP appointment, no waitlist, no extra steps.
Clinically led from day one. No supplements, no transformations, no upsells. Just the data and what it means for your specific biology and goals.
Recent reviews from clients who had an RMR test at our St Helens venue. Verified via Google Business Profile.
★★★★★
"Been logging everything in a calorie app for the best part of half a year and the weight just would not shift. The RMR test came back well below what the app assumed, so my deficit was barely a deficit at all. First time the numbers have actually made sense."
★★★★★
"Building up the mileage for the St Helens 10K and wanted to make sure I was actually eating enough on the bigger weeks. The RMR result anchored the whole nutrition plan. Knew what to eat on easy days versus long-run days and got to the start line feeling strong rather than drained."
★★★★★
"Hit perimenopause and suddenly the things that used to keep my weight steady stopped working. The RMR test confirmed my metabolic rate had genuinely dropped. It made months of frustration make sense and gave me a real number to take to my nutritionist."
Six things every St Helens RMR client gets, as standard.
Your exact calorie burn at complete rest, the true baseline and not a population-average estimate. The number every nutrition plan should start from. Measured at Evolution Fitness XL, West Park, St Helens (WA10 3TF), using a clinical metabolic cart.
Your RMR scaled to your actual activity level, giving you a realistic daily calorie target for maintenance, fat loss or muscle gain.
Shows whether your body is predominantly burning fat or carbohydrate at rest, relevant context for metabolic health and nutrition strategy.
Emailed within 48 hours with your results, reference ranges and interpretation. Share it with your dietitian, coach or GP.
Alongside your report, a member of the TELOMYX team will give you specific recommendations based on your own metabolism and goals, so you know what to actually do with your results.
The test takes 20 minutes lying still under a metabolic canopy. From arriving at Evolution Fitness XL to leaving, plan for 30 to 40 minutes. More on RMR →
Our metabolic testing equipment is mobile across St Helens. Below is where you can currently book a St Helens RMR slot. To see all tests and testing locations currently available in St Helens click here.
Tests available: DEXA scan · VO2 Max test · RMR test
These are just a handful of the most common reasons people in St Helens book an RMR test with us. For the full list, hit Goals in the top navigation bar.
For all other goals, see Goals in the top navigation.
Book online in 60 seconds. Pick a slot at Evolution Fitness XL, Unit 1 Duncan Street, St Helens (WA10 3TF). No referral needed. Just book, follow the pre-test guidelines and turn up.
Read your pre-test guidelines carefully. You will receive a confirmation email with the full pre-test guidelines for an RMR test. These cover fasting requirements (typically 4 to 6 hours with no food or caloric drinks), no caffeine beforehand, and no intense exercise for at least 12 hours before your appointment. Please read them in full. The guidelines matter more for RMR than for almost any other test, as recent food, caffeine or activity directly elevates your metabolic rate and will skew the result upward.
Arrive and get tested. A member of the TELOMYX team meets you at Evolution Fitness XL reception. You will be set up on a reclined couch and fitted with a transparent metabolic canopy that sits over your head and upper body. You lie still and breathe normally for around 20 minutes while the system analyses your exhaled gases, measuring your oxygen consumption and CO2 production to calculate exactly how much energy your body burns at rest.
Results walkthrough and targeted advice. A member of the TELOMYX team walks you through your RMR result, your estimated total daily energy expenditure at different activity levels, and your respiratory exchange ratio. You will get specific recommendations based on your own metabolism and goals, not a generic printout explanation but actionable advice tailored to you.
Full medical PDF report within 48 hours. Comprehensive report emailed to you with your RMR, TDEE estimates at multiple activity levels, respiratory exchange ratio and interpretation. Ready to share with your dietitian, nutritionist, coach or GP. Includes reference ranges so you can benchmark your metabolic rate against expected values for your age and sex.
RMR tells you how many calories your body burns. Pair it with DEXA for body composition and bone density, or VO2 Max for your aerobic fitness ceiling.
£210
Full body composition plus metabolic rate in one session. Our most popular bundle.
From £120
Gold-standard body composition, visceral fat and bone density in a 7-minute scan. Often combined with RMR in the same session.
From £150
Treadmill-based aerobic capacity test, the gold standard for measuring true cardiovascular fitness.
No. Unlike DEXA, an RMR test requires no medical referral. Book a slot at Evolution Fitness XL, Unit 1 Duncan Street, St Helens (WA10 3TF), follow the pre-test guidelines and turn up. No GP appointment, no waitlist, no extra steps.
The test itself takes around 20 minutes lying still under a metabolic canopy. Including setup, your results walkthrough and targeted goal advice, plan for 30 to 40 minutes at Evolution Fitness XL, West Park. On-site parking is available. Your full medical PDF report follows by email within 48 hours.
A standalone RMR test is £110. The DEXA + RMR bundle is £210 and is the most popular option for clients focused on nutrition and body composition. See our bundles page for multi-test options.
Calorie calculators (Harris-Benedict, Mifflin-St Jeor, MyFitnessPal estimates) use population-average formulas. For any individual they can be off by 200 to 500 kcal per day, enough to undermine months of dieting or training. An RMR test measures your actual oxygen consumption and CO2 production, which is a direct physiological measurement, not an estimate. If you are making nutritional decisions based on a calculator, you are working from a guess.
Yes. You should fast for at least 4 to 6 hours before your test: no food, no caloric drinks, no caffeine. Avoid intense exercise for at least 12 hours beforehand and arrive in a rested, calm state. Full pre-test guidelines are sent when you book. Following them matters more for RMR than for almost any other test: recent food, caffeine and exercise all temporarily elevate your metabolic rate and will push your result above your true baseline.
Your RMR (in kcal/day) is the number of calories your body burns at complete rest. It accounts for roughly 60 to 70% of total daily energy expenditure for most people. From your RMR, your report includes estimated total daily energy expenditure (TDEE) at different activity levels, giving you a realistic daily calorie target for maintenance, fat loss or muscle gain. Your result also includes your respiratory exchange ratio (RER), which indicates whether your body is predominantly burning fat or carbohydrate at rest.
Several factors can depress RMR below population-average estimates: prolonged calorie restriction (metabolic adaptation), low muscle mass, thyroid dysfunction, certain medications, and age-related hormonal changes, particularly in women around perimenopause and menopause. If your measured RMR comes back lower than predicted, the TELOMYX team will discuss the likely contributing factors and what that means for your calorie targets going forward.
It depends on your goal. If your primary question is about calorie targets or why your current approach is not working, RMR alone answers it. If you also want to understand your body composition, specifically how much of your weight is fat, muscle and bone, then the DEXA + RMR bundle gives you both in a single session at Evolution Fitness XL. Most clients focused on body recomposition, weight management or metabolic health book both, because knowing your calorie burn without knowing your body composition gives you half the picture.
RMR is relatively stable over time. Most clients retest every 6 to 12 months, or when something significant changes: a major shift in weight, a meaningful change in training volume, starting or stopping medication, or a hormonal transition such as perimenopause. Clients managing weight or fuelling across a St Helens race season often retest at the start of each main training block.
Yes, particularly for athletes in high-volume training. RMR gives you the calorie floor, the minimum intake required to maintain basic physiological function. Athletes who underfuel relative to training load commonly experience suppressed performance, slower recovery, increased injury risk and, over time, hormonal disruption. Knowing your RMR and applying an accurate total energy expenditure multiplier means you can fuel your training properly rather than by feel or generic online estimates.
No. They measure completely different things. A DEXA scan measures what your body is made of: fat mass, lean mass and bone mineral density. An RMR test measures how much energy your body burns at rest. They complement each other well, which is why the DEXA + RMR bundle is our most popular option. DEXA tells you your body composition; RMR tells you your calorie baseline. Together they give you the two numbers most nutrition plans need but rarely start from.
The respiratory exchange ratio is the ratio of CO2 you produce to O2 you consume. At rest, an RER near 0.7 indicates predominantly fat burning; near 1.0 indicates predominantly carbohydrate burning. Most people fall between 0.75 and 0.90 at rest. A high resting RER can reflect high carbohydrate intake in the hours before the test (which is why fasting matters), chronic stress, or a metabolic state where the body struggles to access fat stores efficiently. Your report includes your RER with a plain-English interpretation.
From £110. Full medical report within 48 hours. No referral needed.
