- Aug 14, 2018
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Linear, undulating, block, conjugate — periodization models get argued about with religious intensity in lifting circles. The research comparing them tells a calmer story: having organised variation in your training matters; which specific model you pick matters much less than the argument suggests.
Start with the clearest finding. Williams and colleagues (Journal of Strength and Conditioning Research, 2017) meta-analysed periodized versus non-periodized resistance training and found periodized programs produced meaningfully greater strength gains — having some planned progression of intensity and volume beat just training hard. That's the big effect, and it's mostly about structure existing at all.
Within periodization, the comparisons get quieter. Harries and colleagues' meta-analysis (2015) compared linear periodization (intensity rises steadily over weeks while volume falls) against daily/weekly undulating models (intensity and reps change session to session) and found a small edge for undulating on some upper-body strength outcomes and essentially no separation for lower body. Individual trials bounce both ways, samples are usually small and short, and most subjects are young trained men — a fair reason to hold all these conclusions loosely. Block periodization, where phases emphasise one quality at a time, has its strongest support in advanced and elite athletes, precisely the population least represented in the trials most of us read.
There's a practical logic underneath the statistics that the studies can't capture. Undulating models give you a heavy day after a poor night's sleep by swapping sessions; linear models are dead simple to follow and progress-check; blocks make sense when a competition date forces priorities. Fatigue management, exercise variety for joint tolerance, and plain psychological freshness — not dreading week nine because it looks exactly like week three — are legitimate reasons to choose a structure, and adherence over a year will swamp the couple-of-percent differences the meta-analyses are hunting for.
So the evidence-based hierarchy looks like: any sensible plan beats no plan; progression built into the plan beats variety for its own sake; and between the major models, choose the one whose rhythm fits your life, recovery, and temperament. The spreadsheet you actually follow for 40 weeks is the best periodization model ever tested on the only subject you'll ever be.
Which model are you running right now, and is it by genuine choice or just what you started with? Has anyone switched models mid-career and found their progress honestly changed — or just their enthusiasm?
Start with the clearest finding. Williams and colleagues (Journal of Strength and Conditioning Research, 2017) meta-analysed periodized versus non-periodized resistance training and found periodized programs produced meaningfully greater strength gains — having some planned progression of intensity and volume beat just training hard. That's the big effect, and it's mostly about structure existing at all.
Within periodization, the comparisons get quieter. Harries and colleagues' meta-analysis (2015) compared linear periodization (intensity rises steadily over weeks while volume falls) against daily/weekly undulating models (intensity and reps change session to session) and found a small edge for undulating on some upper-body strength outcomes and essentially no separation for lower body. Individual trials bounce both ways, samples are usually small and short, and most subjects are young trained men — a fair reason to hold all these conclusions loosely. Block periodization, where phases emphasise one quality at a time, has its strongest support in advanced and elite athletes, precisely the population least represented in the trials most of us read.
There's a practical logic underneath the statistics that the studies can't capture. Undulating models give you a heavy day after a poor night's sleep by swapping sessions; linear models are dead simple to follow and progress-check; blocks make sense when a competition date forces priorities. Fatigue management, exercise variety for joint tolerance, and plain psychological freshness — not dreading week nine because it looks exactly like week three — are legitimate reasons to choose a structure, and adherence over a year will swamp the couple-of-percent differences the meta-analyses are hunting for.
So the evidence-based hierarchy looks like: any sensible plan beats no plan; progression built into the plan beats variety for its own sake; and between the major models, choose the one whose rhythm fits your life, recovery, and temperament. The spreadsheet you actually follow for 40 weeks is the best periodization model ever tested on the only subject you'll ever be.
Which model are you running right now, and is it by genuine choice or just what you started with? Has anyone switched models mid-career and found their progress honestly changed — or just their enthusiasm?