The Norwegian double threshold method has reshaped how elite distance runners approach lactate threshold training. Popularised by coaches Marius Bakken and Gjert Ingebrigtsen — the architect behind Jakob Ingebrigtsen's 1500m Olympic gold — the method replaces one long threshold session with two shorter sessions in the same day, each targeting blood lactate concentrations of approximately 4 mmol/L.
The rationale is simple but powerful: by splitting threshold volume across AM and PM sessions, athletes accumulate 40-50 minutes of quality threshold work per day while keeping individual session stress manageable. Research from the Norwegian Olympic Training Centre shows this approach produced a 3-5% improvement in VO2max over 12 weeks in already well-trained runners.
Why Two Sessions Beat One
A single 50-minute threshold run generates significant neuromuscular fatigue and glycogen depletion. Pace drifts upward in the final 15 minutes, meaning you spend less time at the intended physiological intensity. Splitting the same volume into two 25-minute blocks keeps each session controlled. Heart rate stays in the threshold corridor — typically 82-88% of max heart rate — for nearly the entire duration.
Additionally, the recovery between sessions (6-8 hours) allows partial glycogen replenishment and nervous system recovery, meaning the PM session quality remains high. Studies by Seiler et al. (2013) confirm that session-to-session recovery is a primary determinant of training quality in polarised and threshold-based programmes.
Session Structure: AM and PM Workouts
The classic Norwegian protocol uses two distinct formats:
- AM session (intervals): 5 x 6 minutes at threshold pace with 60-90 seconds recovery jog. Total threshold time: 30 minutes. Target lactate: 3.5-4.5 mmol/L.
- PM session (continuous): 25-30 minutes of continuous running at threshold pace. This session teaches sustained effort and mental tolerance at threshold intensity.
Both sessions should be preceded by a 15-20 minute easy warm-up and followed by a 10-minute cool-down. Total daily running volume on a double threshold day typically reaches 20-25 km.
Weekly Integration
The Norwegian model typically programmes 2-3 double threshold days per week, with the remaining days filled by easy aerobic running at 65-72% of max heart rate. A sample week might look like:
- Monday: Double threshold (AM intervals + PM continuous)
- Tuesday: Easy 60-minute run
- Wednesday: Double threshold
- Thursday: Easy 50-minute run + strides
- Friday: Double threshold
- Saturday: Long run (90-120 minutes, easy pace)
- Sunday: Rest or 30-minute recovery jog
Who Should Use This Method
This approach is not for beginners. The Norwegian method is designed for experienced runners with a VO2max above 55 ml/kg/min who have been consistently training for at least 2-3 years and are already running 70+ km per week. Attempting double threshold sessions on an insufficient aerobic base risks overtraining, soft tissue injury, and hormonal disruption.
Key readiness indicators include: the ability to complete a 30-minute threshold run without significant pace drift, a resting heart rate below 50 bpm, and consistent sleep of 8+ hours per night.
Overtraining Risks and Monitoring
The primary risk of the double threshold method is accumulated fatigue that exceeds recovery capacity. Monitor these markers weekly: resting heart rate (a rise of 5+ bpm signals overreach), heart rate variability (a 10%+ drop suggests incomplete recovery), and subjective mood and motivation using a 1-10 scale.
Nutrition is non-negotiable — threshold sessions burn 600-900 kcal each, demanding 8-10g of carbohydrate per kg of body weight daily. Fueling around sessions is critical: consume 1-1.5g/kg of carbohydrates 2 hours before each session and 0.8g/kg within 30 minutes after. Use the Race Day Nutrition Planner to dial in your carbohydrate timing and ensure you are fueling adequately for high-volume threshold blocks.