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Date Permissions Signed
Date of Award
Master of Education (MEd)
Health and Human Development
Suprak, David N. (David Nathan)
Brilla, Lorraine R., 1955-
Chalmers, Gordon R.
Postactivation potentiation (PAP) is the phenomenon in which a highly trained power athlete may be able to obtain a higher rate of force development (RFD) and greater power performance following a heavy muscular loading stimulus. Research on the mechanisms of PAP indicate that it may be caused by myosin light chain (MLC) phosphorylation due to intramuscular calcium saturation during intense contraction. For PAP to be used effectively in actual performances, guidelines for its use need to be developed. This study examined the predictors of PAP, hypothesized as relative strength (REL), absolute strength (ABS), initial reactive strength index (PreRSI), and initial mean RFD (PreMRFD). Linear regressions (Î± = .025) were applied using those four variables for each of the outcome measures: percent change in MRFD (%MRFD), and percent change in RSI (%RSI). Means baseline values of the same four independent variables were also compared (Î± = .00625) between potentiated and fatigued subject groups as measured by %MRFD and %RSI. REL significantly predicted %RSI (p = .006), and ABS, PreMRFD, and PreRSI significantly predicted %MRFD (p < .001). Using a cutoff value of 10% change from baseline, REL and ABS were both higher (p = .004, p = .003) in potentiated subjects with respect to %MRFD, and REL was higher (p = .005) in potentiated subjects with respect to %RSI. PAP occurs more in subjects with high REL and ABS, while subject with low REL and ABS exhibit fatigue.
Western Washington University
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Harrison, Alexander, "Postactivation potentiation: predictors in NCAA Division II varsity track and field power athletes" (2011). WWU Graduate School Collection. 130.