The often-ignored support system
Muscles can adapt to training in 6-8 weeks. Connective tissue takes much longer. Understanding this delta is the difference between progressive overload and injury.
Tendons (muscle → bone)
Dense fibrous tissue that transmits force from muscle to bone. Examples: Achilles, patellar, biceps brachii distal tendon.
- Get stronger with progressive loading, especially heavy-slow resistance and isometrics
- Adapt SLOWER than muscle (months vs weeks)
- Major source of overuse injury when muscles get strong faster than tendons
- Treatment for tendinopathy: heavy-slow eccentric loading, NOT rest
Ligaments (bone → bone)
Connect bones at joints. Examples: ACL, MCL, ankle ligaments, spinal ligaments.
- Much less responsive to training than tendons
- Once injured (sprained or torn), often takes 6 weeks to 6 months to heal
- Grade I = stretched, no instability. Grade II = partial tear, mild instability. Grade III = complete tear, often surgical.
- Don't have great blood supply → slow healing
Fascia
A continuous web of connective tissue that wraps and connects every muscle, organ, and bone in the body. The deep fascia layer in particular transmits force between muscles.
- Responsive to foam rolling, stretching, and movement variation
- Restrictions in one area can cause pain elsewhere (referred pain)
- "Tight muscles" are often tight fascia
Healing timelines (rough)
- Muscle strain Grade 1: 1-3 weeks
- Muscle strain Grade 2: 4-8 weeks
- Tendon strain: 4-12 weeks
- Tendinopathy (chronic overuse): 3-6+ months
- Ligament sprain Grade 1: 2-4 weeks
- Ligament sprain Grade 2: 4-8 weeks
- Ligament Grade 3: 6 months to surgical repair
- Stress fracture: 6-12 weeks
Programming around injuries
- Train AROUND, not THROUGH, acute injuries
- Pain-free range only
- Build to heavy-slow eccentrics for tendinopathy
- Surrounding tissue (uninjured muscles around an injury) should still train
- Cardiovascular fitness can almost always be maintained