No Differences Between 12 Weeks of Block- vs. Traditional-Periodized Training in Performance Adaptations in Trained Cyclists
Participants
n=30 trained cyclists (VO2peak 58 ± 8 ml·kg−1·min−1): block periodization (BP, n=14) vs traditional periodization (TP, n=16).
Protocol
12 weeks, load-matched.
BP: weekly concentration of high- (HIT), moderate- (MIT) and low-intensity (LIT) training.
TP: weekly, cyclic progressive increase in training load across HIT, MIT and LIT sessions ("best practice" traditional).
Outcomes: 5-min and 40-min time-trial power, maximal aerobic power (Wmax), power at 4 mmol·L−1 lactate (W4mmol), gross efficiency, VO2peak, muscle biopsies (enzymes, proteins, capillaries), haematology.
Key Results
No group differences in time-trial performance or in most muscular and haematological adaptations.
Both groups improved 5-min and 40-min TT power by 9 ± 9% and 8 ± 9% (both p < 0.001), Wmax by 6 ± 7% (p = 0.001) and W4mmol by 10 ± 12% (p = 0.001); gross efficiency in a semi-fatigued state rose 0.5 ± 1.1%-points (p = 0.026).
VO2peak and fresh-state gross efficiency were unchanged in both groups.
Where the groups differed: red blood cell volume rose 10 ± 16% more in BP (p = 0.029); capillaries around type I fibres rose 20 ± 12% more in TP (p = 0.002). TP increased capillary-to-fibre ratio 36 ± 15% and capillaries around type I fibres 17 ± 8%; BP increased capillary density 28 ± 24%.
Muscle HAD protein rose 55 ± 58% in TP only; COXIV rose 72 ± 34% in both; CS and PFK activities were unaltered.
Practical Application
In 30 trained cyclists, 12 load-matched weeks of block periodization (HIT concentrated into weeks) and traditional periodization (cyclic progressive load) produced the same performance gains — about 9% in 5-min power, 8% in 40-min power, 6% in Wmax and 10% in W4mmol — with no difference between models.
Periodization model choice is less critical than consistent execution of the same total load; pick the structure the athlete can sustain.
The block model carried no performance penalty and no performance advantage here; haematological and capillary adaptations differed in direction between models, but that did not show up in time-trial power.
Not from this paper; the base's own practice: our block layout (heat → metabolic → threshold → VO2 → taper) is a house structure, not something this trial tested.
Limitations
Trained (not elite) cyclists, n=30, 12 weeks; performance measured as laboratory TTs; VO2peak did not change in either group.
How this entry was checked and changed
Why this level
regraded 2026-09-27 from A: parallel RCT, n=30 (14 vs 16)
Content correction 2026-09-27
Title "Block periodization + tapering effects" -> the paper's title; it does not study tapering.
Added participants (n=30: BP 14, TP 16, VO2peak 58 ± 8), protocol and the abstract's results (both groups +9%/+8% TT power, +6% Wmax, +10% W4mmol; no group difference; RBC volume and capillary differences).
"Block approach (Heat→Metabolic→Threshold→VO2→Taper) works" -> relabelled as the base's own structure, not tested here.
Level A -> B+ (parallel RCT, n=30).
Cross-reference pointed at an entry whose content does not match the label (checked against the cited entry); repointed or relabelled.
Resync 2026-09-28: REF-136 listed twice in Cross-References -> duplicate removed.