Makspulsen påvirker pulssonen.

Because Norwegian normally writes compound nouns as one word.

• makspuls = maks
  • puls
• pulssone = puls
  • sone

This is much more consistent in Norwegian than in English. Where English might use maximum heart rate or heart-rate zone, Norwegian usually prefers a single compound word.

A useful rule: in Norwegian compounds, the last part is the main noun. It decides the basic meaning and how the word behaves grammatically.

Because the compound is built from puls + sone.

• puls ends in s
• sone starts with s

When they join, both letters stay, so you get pulssone.

Then the definite ending -en is added:

• pulssone → pulssonen

So the spelling is completely regular.

The ending -en marks the definite singular form in Bokmål for nouns that normally take en.

So:

• en makspuls = a maximum heart rate
• makspulsen = the maximum heart rate

and

• en pulssone = a pulse zone / heart-rate zone
• pulssonen = the pulse zone / heart-rate zone

Unlike English, Norwegian often puts the at the end of the noun instead of using a separate word.

The dictionary forms are the indefinite singular forms:

• en makspuls
• en pulssone

In the sentence, both appear in the definite singular:

• makspulsen
• pulssonen

If you look them up in a dictionary, you would normally search for makspuls and pulssone.

Because påvirker is the present tense form of the verb å påvirke.

• å påvirke = to affect
• påvirker = affects / is affecting
• påvirket = affected
• har påvirket = has affected

In this sentence, the present tense is used because it expresses a general fact or relationship.

Also, Norwegian verbs do not change for person the way English verbs sometimes do. So you get:

• jeg påvirker
• du påvirker
• han/hun påvirker

The form stays the same.

Yes. This sentence uses the straightforward pattern:

subject + verb + object

• Makspulsen = subject
• påvirker = verb
• pulssonen = object

So it matches English very closely.

However, Norwegian main clauses follow the verb-second rule. In this sentence, the subject comes first, so it looks simple. But if another element came first, the verb would still stay in second position.

Example:

• I praksis påvirker makspulsen pulssonen.

So this sentence is simple, but it still fits a larger Norwegian word-order rule.

Yes, you could, but the nuance changes.

• Makspulsen påvirker pulssonen sounds like the maximum heart rate is being referred to as a known or conceptually established thing.
• Makspuls påvirker pulssonen sounds more like a more general or label-like statement about max heart rate as a concept.

In technical or explanatory Norwegian, the definite form is often used where English might sound more natural with a bare noun. So the original sentence is very natural.

Yes. maks is a shortened form related to maksimal or maksimum.

So makspuls is basically maximum heart rate in a compact Norwegian form. This kind of shortening is very common in everyday Norwegian, especially in areas like training, sports, and health.

You may also see maksimalpuls, which is a fuller and slightly more formal version.

Å påvirke normally takes a direct object. No preposition is needed.

Pattern:

• å påvirke noe
• å påvirke noen

So in the sentence:

• Makspulsen = the thing doing the affecting
• pulssonen = the thing being affected

This works exactly the way affect works in English.

Example:

• Søvn påvirker humøret.
• Sleep affects mood.

A rough English-friendly approximation is:

MAHKS-puls-en POH-vir-ker PULSS-so-ne(n)

A few important notes:

• a in maks is more open than in many English words
• u in puls is not exactly English oo
• å in påvirker is roughly like the vowel in more for many English speakers, but not identical
• y in påvirker has no exact English equivalent; it is a rounded front vowel

So the approximation helps, but the real Norwegian sounds are a bit different from English ones.