It's been well-known for decades that each additional 50g on a shoe requires 1% more aerobic function for the same speed, and the gains do not magically level off as you imply.
well-known for decades
A systematic review should be a piece of piss to come by then.
@NotThamesWater started
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It's been well-known for decades that each additional 50g on a shoe requires 1% more aerobic function for the same speed, and the gains do not magically level off as you imply.