ArticleMuscles (Basel, Switzerland)2026
Do Sprinters and Jumpers Differ in the Acute Countermovement-Jump Response to Isometric Conditioning Protocols? An Exploratory Study.
Article in Muscles (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Sprinters and jumpers differ in their force-velocity demands, so this exploratory study compared their acute countermovement jump (CMJ) response to isometric conditioning.
methodsTwenty-two competitive track and field athletes (10 sprinters, 12 jumpers; 19.1 ± 3.3 y) were alternately allocated from a randomised list to a 3 × 5 s isometric knee-extension or isometric half-squat (
resultsSprinters increased (+2.40 ± 4.46%) whereas jumpers decreased (-2.02 ± 6.44%). Discipline and protocol were analysed jointly in one additive model. The protocol contrast was small and imprecise (-0.25 percentage points [ISO-SQ relative to IKE], 95% CI -5.50 to 5.00;
conclusionsThe primary comparison was inconclusive and materially attenuated by age adjustment but directionally consistent across trial summaries and protocols. The observed discipline-dependent pattern is hypothesis-generating and requires confirmation in adequately powered, controlled trials.
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