Isometric quadriceps activation

Purpose of the exercise

Activation and strength exercise for the quadriceps (especially vastus medialis obliquus/VMO). Improves neuromuscular control of the quadriceps, prevents quadriceps atrophy after injury and helps restore the knee extension reflex. Also effective for reducing swelling, stimulating blood circulation and preparing the knee for more strenuous exercises.

Supplies

• Mat or soft surface
• Optional: towel or foam roll under the knee for feedback
• Sufficient space to lie outstretched

Starting position

1. Lie on your back on a mat
2. Fully extend both legs
3. Optional: place a rolled-up towel under your knee
4. Let your arms relax next to your body
5. Keep your head relaxed on the ground

Implementation

1. Tighten your quadriceps to the max
2. Actively push your knee down (into the ground or towel)
3. Pull your toes towards you (dorsal flexion)
4. Try to pull your kneecap towards your hip
5. Feel your quadriceps getting hard
6. Hold this contraction for 5-10 seconds
7. Relax completely
8. Rest 2-3 seconds
9. Repeat the contraction

Points of interest

• ✓ Tighten your quadriceps to the max (100% contraction)
• ✓ Keep the contraction static (no movement)
• ✓ Actively push your knee down
• ✓ Pull your toes towards you during contraction
• ✓ Breathe calmly (do not hold your breath)
• ✓ Focus on driving the VMO (inner quad)
• ✗ Avoid lifting your leg (should stay flat)
• ✗ Don't tighten your other muscles unnecessarily
• ✗ Don't hold your breath
• ✗ Give up too soon - really stretch to the max

When this exercise?

This exercise is suitable from day 1 post-operatively after knee surgery (cruciate ligament, meniscus, patella) or in acute knee pain (in consultation with physiotherapist). Ideal as very first quadriceps exercise when movement is still limited. Very effective for preventing quadriceps atrophy in the first days/weeks after injury. Perfect as daily exercise, often prescribed to do 10-20 repetitions every hour. Also valuable for learning to control the quadriceps for people who have difficulty with quad activation. Suitable for all ages. Can be combined with straight leg raises. For swelling or pain, the exercise can help by creating pumping action. Start with 10 repetitions per hour and build up.