Triphasic Training: Eccentric, Isometric, Concentric

Triphasic training is an advanced periodisation method developed by Cal Dietz, the former head strength coach at the University of Minnesota. It systematically trains each of the three muscle actions - eccentric (lowering), isometric (holding), and concentric (lifting) - in dedicated blocks. This method has been used to develop elite athletes worldwide and offers Malaysian lifters a structured approach to breaking through performance plateaus.

The Three Phases of Muscle Action

Every repetition consists of three distinct phases:

Eccentric Phase

The lowering or lengthening portion of the exercise. During a squat, this is when you descend. During a bench press, this is when the bar comes down to your chest. The eccentric phase is where you can handle the most load - approximately 120 to 140 percent of your concentric maximum.

Isometric Phase

The transition point between lowering and lifting. During a squat, this is the brief pause at the bottom. This phase is about absorbing and redirecting force, which is critical for athletic performance and injury prevention.

Concentric Phase

The lifting or shortening portion. During a squat, this is when you stand up. This is the phase most lifters focus on, but it is only one-third of the equation.

The Triphasic Training Programme Structure

Block 1: Eccentric Emphasis (Weeks 1-3)

Focus on slow, controlled eccentric phases to build strength and resilience in the lengthening muscle action.

Example squat protocol:

• Lower for 5 seconds (eccentric)
• No pause at the bottom
• Explode up as fast as possible (concentric)
• Use 80 to 85 percent of 1RM
• 3 sets of 3 reps

This block builds tendon strength, improves muscle damage resistance, and develops the ability to absorb force - essential for Malaysian athletes who play sports involving deceleration like futsal and badminton.

Block 2: Isometric Emphasis (Weeks 4-6)

Focus on holding at the transition point to improve force absorption and rate of force development.

Example squat protocol:

• Lower at normal speed
• Hold at the bottom for 4 to 6 seconds
• Explode up as fast as possible
• Use 80 to 85 percent of 1RM
• 3 sets of 3 reps

This block is particularly demanding on the nervous system. Ensure adequate sleep and nutrition during this phase. Malaysian lifters should prioritise hydration given the energy demands combined with tropical heat.

Block 3: Concentric Emphasis (Weeks 7-9)

Focus on explosive concentric movements to maximise power output.

Example squat protocol:

• Lower at normal speed
• No pause
• Explode up as fast and hard as possible
• Use 80 to 85 percent of 1RM for triples, or 50 to 60 percent for speed work
• 3 to 6 sets of 2 to 3 reps

Applying Triphasic Training to Common Exercises

Bench Press

• Eccentric block: 5-second lowering, explode up. 3 sets of 3 at 82 percent.
• Isometric block: Normal lower, 5-second pause on chest, explode up. 3 sets of 3 at 80 percent.
• Concentric block: Normal lower, immediate explosive press. 5 sets of 2 at 85 percent.

Deadlift

• Eccentric block: 5-second lowering from the top. 3 sets of 3 at 80 percent.
• Isometric block: Pull to just below the knee, hold for 5 seconds, then complete the lift. 3 sets of 3 at 80 percent.
• Concentric block: Pin pulls or block pulls from the floor with maximum acceleration. 4 sets of 2 at 85 percent.

Benefits for Malaysian Athletes

Injury Prevention

The eccentric block builds resilient tendons and muscles that are better prepared to handle sudden forces. This is valuable for athletes who play on hard futsal courts or uneven outdoor fields common in Malaysia.

Improved Change of Direction

The isometric block enhances your ability to absorb force and redirect it quickly. This directly transfers to agility in sports like badminton, futsal, and martial arts.

Explosive Power

The concentric block develops the fast-twitch muscle fibres responsible for jumping, sprinting, and explosive movements.

Recovery Considerations

Triphasic training is demanding, particularly the eccentric and isometric blocks. Prioritise:

• Sleep: Aim for 7 to 9 hours. This is a challenge for many Malaysians who stay up late, but it is non-negotiable during intense training.
• Nutrition: Ensure adequate protein (1.6 to 2.2 grams per kilogram of bodyweight) and carbohydrate intake to fuel recovery.
• Deload: Take a deload week between each 3-week block, reducing volume by 40 to 50 percent.

Who Should Use Triphasic Training?

This method is best suited for intermediate to advanced athletes with at least 2 years of consistent training experience. You should have a solid foundation in the main lifts and understand proper technique, as the extended eccentric and isometric phases demand excellent movement quality under fatigue.

Beginners will benefit more from traditional progressive overload programmes. Build your base first, then explore triphasic training when your progress begins to stall.