Cardiorespiratory Assessment

This assessment combines two of the most powerful diagnostic tools in longevity medicine: a Resting Metabolic Rate evaluation and a VO2 Max test.

Together, they reveal how efficiently your body produces energy at rest and how well it performs under physical demand, giving us a complete picture of your metabolic and cardiovascular health.

Resting Metabolic Rate (RMR) Assessment

A clinical breath test that reads your metabolism directly

Using indirect calorimetry, this test analyzes the oxygen you absorb and the carbon dioxide you exhale at rest to measure your Resting Metabolic Rate (RMR) and Respiratory Exchange Ratio (RER) in real time.

From this data, our team can assess your metabolic flexibility: your body’s ability to switch between burning glucose and fat for fuel.

The inability to make this transition, known as metabolic inflexibility, often precedes metabolic syndrome and insulin resistance, sometimes years before standard lab results show any abnormality.

Who is this for

This assessment is recommended if you

Those with chronic fatigue that standard lab tests cannot explain

Those struggling to lose weight despite consistent diet and exercise

Healthy individuals or athletes who want to optimize metabolic flexibility

Cardiorespiratory Capacity (VO2 Max)

The clinical gold standard for cardiovascular fitness

The VO2 Max test measures the maximum volume of oxygen your body can absorb, circulate, and use during intense physical activity. It evaluates how well your lungs, heart, and skeletal muscles work together under measured physical stress.

In longevity medicine, VO2 Max is recognized as one of the strongest independent predictors of all-cause mortality, more predictive than many conventional risk factors.

Your results form the basis of a personalized exercise protocol, including your optimal Zone 2 Heart Rate for stimulating mitochondrial development without triggering excessive oxidative stress.

Who this is for

This assessment is recommended if you

Those who want to assess their cardiovascular fitness against their biological age

Those at risk of sarcopenia or functional decline who need safe, measured exercise guidance

Those completing cardiovascular rehabilitation who need a personalized progression plan

What to expect

Two tests, one complete picture, in a single visit

Both tests use the same clinical breath analysis system. The resting evaluation is done while you sit comfortably and breathe normally through a mask, taking around 15 to 20 minutes.

The VO2 Max test follows, with a progressively intense activity conducted under full medical supervision and calibrated to your current fitness level. Together, the results give our team everything needed to build a precise, personalized plan for your metabolism and your cardiovascular health.

Testimonials

Real journeys, real results

Every journey is unique, but they all begin with the same step, understanding your body on a deeper level

Kezia

NAD+ Infusion

36 Years Old

“Before trying NAD+ Infusion at Previ, I often had trouble sleeping, felt easily tired, and found it hard to stay focused, which affected my productivity at work. After the treatment, I slept better, felt more energized, and noticed my focus improving. I also felt safe knowing the process was supported by a professional doctor. As a bonus, my skin looked more glowing and refreshed.”

Sonita

NAD+ Infusion

40 Years Old

“After my first NAD+ treatment, I noticed that reading felt more comfortable and my eyes did not get tired as easily. The dryness I usually felt in the afternoon also improved. I later continued with NMN to help maintain my overall condition. For me, NAD+ followed by NMN felt like a good combination to support daily energy and wellness.”

Micel

NAD+ Infusion

– Years Old

“What I noticed most after NAD+ was that my energy came back. Daily activities felt lighter, and I even felt more motivated to go to the gym. My sleep quality also improved. I could sleep for 6–7 hours without waking up often, and I felt fresher in the morning.”

Laody

Secretome Therapy

52 Years Old

“My main concern was pain and stiffness in both knees, especially when standing up from sitting or waking up in the morning. After the therapy at Previ Clinic, my legs felt more relaxed and easier to move. I used to struggle with walking even 1 km, but now I can walk 3–4 km and do my daily activities more comfortably.”

Wiwi

Secretome Therapy

68 Years Old

“I had osteoarthritis in my right knee, which made walking difficult and caused swelling. After receiving secretome injections at Previ Clinic, walking felt much smoother and my knee became more comfortable for light daily activities. Previ Clinic has been a good experience for me.”

Afri

Secretome Therapy

– Years Old

“I had knee pain from OA for months and had tried another treatment before, but did not feel much improvement. After three injections at Previ Clinic, I started to feel the difference. The service was warm, sincere, and very comfortable, so the whole treatment process felt easy and reassuring.”

Get started

Start consultation

Schedule an initial session with our clinical team. We’ll help you understand your body’s condition, needs, and health goals as the first step toward a longer, healthier, and better-quality life.