VMA-031Z5VO2maxVO2maxRunning

Norwegian 4×4 (Helgerud Protocol)

Norwegian VO2max protocol: 4 intervals of 4 minutes at 90-95% of maximum heart rate with 3 minutes of active recovery at 70% HRmax. Helgerud method validated for significant VO2max gains.

Duration: 55min
Level: Advanced
Target: VO2max

Flat preferred

Session structure

55min · 3 phases

0 min · start55min · end

Intensity scaleZ1RecoveryZ2EnduranceZ5VO2max

Warm-up

20min

Z1-Z2Recovery → EnduranceProgressive jog

15min

No zoneDrills and 4× progressive accelerations

5min

Main Set

4 × 4'/3' Z2

25min

4 ×

Z5VO2max4min at 90-95% HRmax (Z5)

4min

Z2Endurance3min jog low Z2 (70% HRmax)

3min

Cool-down

10min

Z1RecoveryRecovery jog

10min

Zone Distribution

Z1Recovery17min30

Z2Endurance16min30

Z5VO2max16min

Total 55min · No zone 5min

Tips

Target 90-95% HRmax from the second minute of each interval
Active recovery must stay at 70% HRmax, not lower
Use a heart rate monitor to respect the intensities
Progressively increase pace over weeks, not within repetitions

Common Mistakes

Starting too fast and not holding the full 4 minutes
Recovering too slowly (walking) instead of maintaining 70% HRmax
Scheduling this session more than once per week

Nutrition & Recovery

Nutrition

Eat your last meal at least 3 hours before the session for optimal digestion.
Carb snack 1 to 1.5 hours before: banana, energy bar, or applesauce.
Avoid high-fiber and high-fat foods before the session (legumes, fried foods).

Hydration

Drink 400 to 500 ml of water in the 2 hours before the session.
Top up with 200 ml in the 15 to 30 minutes before heading out.
Avoid diuretic beverages (excessive coffee, alcohol) in the hours before.

Why it works

Why this format

VO2max represents the ceiling of aerobic capacity. Specific training aims to maximize cumulative time spent between 90-100% of VO2max per session. Adaptations are both central (cardiac output) and peripheral (muscle oxygen extraction). Short-short intermittent (30/30) or long interval (3-5 min) formats allow accumulating 10-15 effective minutes at VO2max per session.

Zones solicited

VO2max

Z5 is the primary target zone: it corresponds to 95-100% of maximal heart rate and the velocity associated with VO2max. The cardiorespiratory system operates at its maximum.

Recovery

Active recovery in Z1 maintains high blood flow, accelerating metabolic clearance between intense repetitions.

Expected adaptations

VO2max increase of 5-15% depending on baseline fitness (greater gains in less trained individuals)
Eccentric cardiac hypertrophy: increased left ventricular end-diastolic volume
Improved capillary density and peripheral oxygen extraction (a-vO2 diff)
Increased mitochondrial electron transport chain enzyme activity
Improved skeletal muscle buffering capacity

2 studies

Billat VL, Slawinski J, Bocquet V, Demarle A, Lafitte L, Chassaing P, Koralsztein JP (2000) View study →Intermittent runs at the velocity associated with maximal oxygen uptake enables subjects to remain at maximal oxygen uptake for a longer time than intense but submaximal runs
Midgley AW, McNaughton LR, Wilkinson M (2006) View study →Is there an optimal training intensity for enhancing the maximal oxygen uptake of distance runners?

Continue exploring

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Glossary

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VMA-031Z5VO2maxVO2maxRunning

Norwegian 4×4 (Helgerud Protocol)

Norwegian VO2max protocol: 4 intervals of 4 minutes at 90-95% of maximum heart rate with 3 minutes of active recovery at 70% HRmax. Helgerud method validated for significant VO2max gains.

Duration: 55min
Level: Advanced
Target: VO2max

Flat preferred

Session structure

55min · 3 phases

0 min · start55min · end

Intensity scaleZ1RecoveryZ2EnduranceZ5VO2max

Warm-up

20min

Z1-Z2Recovery → EnduranceProgressive jog

15min

No zoneDrills and 4× progressive accelerations

5min

Main Set

4 × 4'/3' Z2

25min

4 ×

Z5VO2max4min at 90-95% HRmax (Z5)

4min

Z2Endurance3min jog low Z2 (70% HRmax)

3min

Cool-down

10min

Z1RecoveryRecovery jog

10min

Zone Distribution

Z1Recovery17min30

Z2Endurance16min30

Z5VO2max16min

Total 55min · No zone 5min

Tips

Target 90-95% HRmax from the second minute of each interval
Active recovery must stay at 70% HRmax, not lower
Use a heart rate monitor to respect the intensities
Progressively increase pace over weeks, not within repetitions

Common Mistakes

Starting too fast and not holding the full 4 minutes
Recovering too slowly (walking) instead of maintaining 70% HRmax
Scheduling this session more than once per week

Nutrition & Recovery

Nutrition

Eat your last meal at least 3 hours before the session for optimal digestion.
Carb snack 1 to 1.5 hours before: banana, energy bar, or applesauce.
Avoid high-fiber and high-fat foods before the session (legumes, fried foods).

Hydration

Drink 400 to 500 ml of water in the 2 hours before the session.
Top up with 200 ml in the 15 to 30 minutes before heading out.
Avoid diuretic beverages (excessive coffee, alcohol) in the hours before.

Why it works

Why this format

Zones solicited

VO2max

Z5 is the primary target zone: it corresponds to 95-100% of maximal heart rate and the velocity associated with VO2max. The cardiorespiratory system operates at its maximum.

Recovery

Active recovery in Z1 maintains high blood flow, accelerating metabolic clearance between intense repetitions.

Expected adaptations

VO2max increase of 5-15% depending on baseline fitness (greater gains in less trained individuals)
Eccentric cardiac hypertrophy: increased left ventricular end-diastolic volume
Improved capillary density and peripheral oxygen extraction (a-vO2 diff)
Increased mitochondrial electron transport chain enzyme activity
Improved skeletal muscle buffering capacity

2 studies

Billat VL, Slawinski J, Bocquet V, Demarle A, Lafitte L, Chassaing P, Koralsztein JP (2000) View study →Intermittent runs at the velocity associated with maximal oxygen uptake enables subjects to remain at maximal oxygen uptake for a longer time than intense but submaximal runs
Midgley AW, McNaughton LR, Wilkinson M (2006) View study →Is there an optimal training intensity for enhancing the maximal oxygen uptake of distance runners?