Q: What was the study design?

Systematic review with random-effects meta-analysis of 31 comparator-controlled trials (25 pooled), n=609 healthy adult female team-sport athletes, PJT duration 2+ weeks versus active or passive control groups. This sits near the top of the intervention hierarchy, but only as strong as the mostly small primary trials feeding it.

Q: How trustworthy is the methodology?

Risk of bias was graded with the PEDro scale: only 9 of 31 studies reached low risk, 20 were moderate and 2 high, so most pooled effects rest on trials with incomplete blinding, allocation concealment or outcome assessor blinding, which a clinician can check by pulling the RoB table rather than trusting the pooled number alone. GRADE certainty was rated low to moderate for every outcome, heterogeneity was moderate (up to I2=73.1%) in four of nine analyses, and training-study literature is prone to publication bias toward positive findings plus likely differences in control-group content (some comparisons were against no training rather than an active alternative), all of which inflate apparent effect size. The abstract reports effect sizes and p-values but not the 95% CIs the methods promised, so true precision around each estimate cannot be judged from what's given.

Q: What is the overall appraisal?

The included studies are PEDro-rated, meaning this is randomised/controlled-trial evidence, so the finding is causal (PJT improves these jump and sprint metrics in adult female team-sport athletes), not just an association. What's uncertain is the magnitude: 20 of 31 studies carried only moderate risk of bias, heterogeneity reached ~73% in four of the pooled outcomes, and GRADE certainty sits at low-to-moderate, so treat the quoted effect sizes (g=0.55 to 1.22) as a plausible range for justifying a programme, not a number to promise an individual athlete.

Q: What is the main limitation?

The methods state 95% CIs were calculated for every pooled estimate, but this abstract excerpt doesn't show them, so the width of uncertainty around each effect size isn't visible from here. Moderate heterogeneity in four of the nine meta-analysed outcomes (up to I2=73%) also means some pooled estimates may be smoothing over real differences in programming and comparator quality. Worth pulling the full results table and any sensitivity analysis excluding the two high-RoB studies before quoting a specific number to a coach or athlete.

Q: What should clinicians do on Monday?

For a clinician or S&C coach already prescribing plyometrics to female team-sport athletes, this supports continuing and favours programming at 8 or more weeks rather than short blocks for sprint and agility gains; it does not establish a scenario where PJT should newly start where it wasn't already indicated.

Q: How do I apply this in practice?

Applies to adult female team-sport athletes (soccer, basketball, volleyball, handball) already inside a structured strength and conditioning programme, not to deconditioned or newly post-injury athletes starting plyometrics from zero. On the performance floor, favour PJT blocks of 8 weeks or longer over a short 4 to 6 week block before competition, since the shorter blocks specifically underperform on drop jump RSI, 10m sprint and Illinois agility time; baseline and re-test with Countermovement jump and Drop jump (Benchmark) every 4 to 6 weeks to confirm the block is translating into reactive strength and speed rather than just accumulating fatigue. In the rehab clinic, the same CMJ height and DJ RSI pairing doubles as a return-to-sport gate once an athlete is cleared for landing load, flagging persistent between-limb asymmetry before a full return to team training. Caveat: the pooled effect sizes justify continuing or extending PJT programming, they don't guarantee a specific gain for any one athlete, given the moderate risk of bias and heterogeneous comparators behind the pooled numbers.

Question 1

What did the study find?

Accepted Answer

Compared to controls, plyometric jump training (PJT) improved CMJ height (Hedges g=0.550, p<0.001), CMJ peak concentric velocity (g=0.623, p=0.011), drop jump reactive strength index (g=0.926, p=0.001), drop jump height (g=0.721, p=0.002), 10m sprint (g=0.712, p=0.032), 20m sprint (g=0.709, p<0.001), 30m sprint (g=1.018, p=0.001), Illinois agility time (g=1.225, p<0.001) and T-test sprint time (g=0.965, p<0.001); interventions of 8+ weeks outperformed those of 6 weeks or less on several measures.

Question 2

What was the study design?

Accepted Answer

Systematic review with random-effects meta-analysis of 31 comparator-controlled trials (25 pooled), n=609 healthy adult female team-sport athletes, PJT duration 2+ weeks versus active or passive control groups. This sits near the top of the intervention hierarchy, but only as strong as the mostly small primary trials feeding it.

Question 3

How trustworthy is the methodology?

Accepted Answer

Risk of bias was graded with the PEDro scale: only 9 of 31 studies reached low risk, 20 were moderate and 2 high, so most pooled effects rest on trials with incomplete blinding, allocation concealment or outcome assessor blinding, which a clinician can check by pulling the RoB table rather than trusting the pooled number alone. GRADE certainty was rated low to moderate for every outcome, heterogeneity was moderate (up to I2=73.1%) in four of nine analyses, and training-study literature is prone to publication bias toward positive findings plus likely differences in control-group content (some comparisons were against no training rather than an active alternative), all of which inflate apparent effect size. The abstract reports effect sizes and p-values but not the 95% CIs the methods promised, so true precision around each estimate cannot be judged from what's given.

Question 4

What is the overall appraisal?

Accepted Answer

The included studies are PEDro-rated, meaning this is randomised/controlled-trial evidence, so the finding is causal (PJT improves these jump and sprint metrics in adult female team-sport athletes), not just an association. What's uncertain is the magnitude: 20 of 31 studies carried only moderate risk of bias, heterogeneity reached ~73% in four of the pooled outcomes, and GRADE certainty sits at low-to-moderate, so treat the quoted effect sizes (g=0.55 to 1.22) as a plausible range for justifying a programme, not a number to promise an individual athlete.

Question 5

What is the main limitation?

Accepted Answer

The methods state 95% CIs were calculated for every pooled estimate, but this abstract excerpt doesn't show them, so the width of uncertainty around each effect size isn't visible from here. Moderate heterogeneity in four of the nine meta-analysed outcomes (up to I2=73%) also means some pooled estimates may be smoothing over real differences in programming and comparator quality. Worth pulling the full results table and any sensitivity analysis excluding the two high-RoB studies before quoting a specific number to a coach or athlete.

Question 6

What should clinicians do on Monday?

Accepted Answer

For a clinician or S&C coach already prescribing plyometrics to female team-sport athletes, this supports continuing and favours programming at 8 or more weeks rather than short blocks for sprint and agility gains; it does not establish a scenario where PJT should newly start where it wasn't already indicated.

Question 7

How do I apply this in practice?

Accepted Answer

Applies to adult female team-sport athletes (soccer, basketball, volleyball, handball) already inside a structured strength and conditioning programme, not to deconditioned or newly post-injury athletes starting plyometrics from zero. On the performance floor, favour PJT blocks of 8 weeks or longer over a short 4 to 6 week block before competition, since the shorter blocks specifically underperform on drop jump RSI, 10m sprint and Illinois agility time; baseline and re-test with Countermovement jump and Drop jump (Benchmark) every 4 to 6 weeks to confirm the block is translating into reactive strength and speed rather than just accumulating fatigue. In the rehab clinic, the same CMJ height and DJ RSI pairing doubles as a return-to-sport gate once an athlete is cleared for landing load, flagging persistent between-limb asymmetry before a full return to team training. Caveat: the pooled effect sizes justify continuing or extending PJT programming, they don't guarantee a specific gain for any one athlete, given the moderate risk of bias and heterogeneous comparators behind the pooled numbers.

Female Team-Sport Athletes' Physical Fitness and Jump Performance Kinematics After Plyometric Jump Training: A Systematic Review and Meta-analysis

The paper

What they found

Study design

Methodology

The appraisal

The gap

Landmark context

What to do Monday

In practice

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