Monitore a frequência cardíaca durante o treino.

Monitore comes from the verb monitorar and is the command form used with você:

• você monitora = you monitor
• Monitore! = Monitor!

In Brazilian Portuguese, commands for você usually use the same form as the present subjunctive. So:

• monitorar → que você monitore → Monitore

If you used tu, the command would normally be monitora in standard grammar.

It is neutral to polite, because it uses the você command form.

In Brazil, você is extremely common and often sounds perfectly natural in everyday speech, not especially stiff. So Monitore a frequência cardíaca durante o treino sounds like normal instruction language you might see in:

• a fitness app
• a trainer’s advice
• a health guide
• a machine display

It is not overly formal, but it is a little more instructional than casual conversation.

The a is the definite article the.

So:

• a frequência cardíaca = the heart rate

Portuguese often uses definite articles in places where English might or might not use the. In instruction-style sentences, it is very normal to say:

• Monitore a frequência cardíaca
• Observe a respiração
• Mantenha a postura

Even when talking generally, Portuguese often sounds more natural with the article here.

Because frequência is a feminine noun, so the adjective must agree with it.

• frequência = feminine
• cardíaca = feminine form of the adjective

This is basic adjective agreement in Portuguese:

• ritmo cardíaco = cardiac rhythm / heart rhythm
• frequência cardíaca = heart rate

So the ending changes to match the noun.

Literally, it means something like cardiac frequency.

But in natural English, the correct meaning is heart rate.

This is a good example of how Portuguese and English may use different wording for the same idea:

• frequência cardíaca → heart rate
• not usually cardiac frequency in normal English

The accents help show pronunciation and stress.

• frequência: the stress falls on ên
• cardíaca: the stress falls on dí

A rough pronunciation guide for English speakers:

• frequência ≈ freh-KWEN-see-a
• cardíaca ≈ kar-JEE-a-ka or kar-DEE-a-ka, depending on accent and how you approximate it

The accents are part of correct spelling and should not be omitted in standard writing.

It means during the workout or during training.

• durante = during
• o treino = the workout / the training session

This phrase emphasizes that the monitoring should happen while the exercise session is going on.

So the idea is not just before or after training, but throughout the training period.

Yes, in many contexts you could, but there is a small difference in feel.

• durante o treino = during the workout, clearly emphasizing the time span
• no treino = in the workout / during the workout, a little broader and slightly less explicit

For example:

• Monitore a frequência cardíaca durante o treino = monitor it while the workout is happening
• Monitore a frequência cardíaca no treino = also understandable, but a bit less precise in tone

In instructional or health-related language, durante often sounds more deliberate and clear.

Here, treino usually means workout, training session, or practice session.

It is often more natural than treinamento in everyday fitness language.

Compare:

• o treino = the workout / the training session
• o treinamento = the training process / training program / more formal training

So in a gym or exercise context, treino is usually the best word.

Yes. Portuguese allows some flexibility.

For example, these are all natural:

• Monitore a frequência cardíaca durante o treino.
• Durante o treino, monitore a frequência cardíaca.

The original version is very natural because it starts with the action word Monitore, which is common in instructions and commands.

That depends on whether the region uses tu or você.

In many parts of Brazil, people still use você even with friends, so the original sentence can already be informal enough:

• Monitore a frequência cardíaca durante o treino.

In areas or contexts where tu is used according to standard grammar, you could say:

• Monitora a frequência cardíaca durante o treino.

But keep in mind that real spoken Brazilian Portuguese varies a lot by region, and command forms with tu are not used the same way everywhere.

A rough guide for an English speaker is:

mon-ee-TOH-ree ah freh-KWEN-see-ah kar-DEE-ah-kah doo-RAHN-chee oo TRAY-noo

A few helpful notes:

• r in treino and frequência is not like a strong English r
• ão does not appear here, so you do not need the nasal sound common in many Portuguese words
• treino sounds roughly like TRAY-noo
• durante is usually pronounced smoothly, with the stress on ran

This is only an approximation, but it can help you get started.