Evidence map›Paper›PMID 40046213›Full record

Trial reportJournal of sports science & medicine2025

Accentuated Eccentric Loading in Countermovement Jumps Vs. Drop Jumps: Effects on Jump Performance and Strength in A Randomized Controlled Trial.

Zhengqiu Gu, Chong Gao, Hang Zheng, Kaifang Liao, Chris Bishop, Jonathan Hughes, Mingyue Yin, Zhiyuan Bi, Zhan Li, Jian Li and 3 more

Abstract readRandomized Controlled Trial
PubMed Full text at PMC Publisher
In one paragraph

Trial report in Journal of sports science & medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

6 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Trial
  4. Trial
  5. Article
  6. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Zhengqiu GuSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Chong GaoSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Hang ZhengSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Kaifang LiaoSchool of Physical Education, Chengdu Sport University, Sichuan, China.
Chris BishopFaculty of Science and Technology, London Sports Institute, Middlesex University, London, UK.
Jonathan HughesCardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK.
Mingyue YinSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Zhiyuan BiSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Zhan LiSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Jian LiSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.
Meixia ChenShanghai Minhang Experimental High School, Shanghai, China.
Jianxi WeiThe Research Center of Military Exercise Science, The Army Engineering University of PLA, Nanjing, China.
Yongming LiSchool of Athletic Performance, Shanghai University of Sport, Shanghai, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study examined the effects of Accentuated Eccentric Loading Countermovement Jump (AEL CMJ) training on jump performance, lower body strength, sprint performance, and change of direction ability, compared to drop jump (DJ) training. This study used a randomized controlled trial (RCT) with a parallel design. Forty men physical education students (Mean ± SD: age 22.60 ± 3.24 years, body mass 75.21 ± 8.12 kg, height 1.79 ± 0.07 m) were randomly assigned to AEL (n = 14), DJ (n = 13), or a control group (CON, n = 13). The AEL and DJ groups trained three times per week for 8 weeks, while the CON group maintained their usual routines. All groups with similar levels of physical activity outside the training. Pre-, mid- (4 weeks), and post-intervention (8 weeks) assessments measured jump performance (CMJ and squat jump (SJ)), 1RM squat strength, 30 m sprint time, and change of direction (T-test). A mixed-effects model evaluated group and time effects. Significant group × time interactions were observed for CMJ height (P = 0.006), with both AEL and DJ training improving CMJ (AEL: +11.8%, ES = 0.77; DJ: +7.7%, ES = 0.47), SJ height (AEL: +5.7%, ES = 0.37; DJ: +11.3%, ES = 0.66), and 1RM squat (AEL: +7.0%, ES = 0.44; DJ: +8.4%, ES = 0.46) at 8 weeks. Neither training method significantly improved sprint or change of direction performance. Additionally, no significant gains were seen in any indicator at 4 weeks. These results indicate that AEL CMJ and DJ training both effectively enhance vertical jump and strength, positioning AEL CMJ as an effective alternative or complement to DJ training.

Indexed as

Athletic PerformanceMuscle StrengthPlyometric ExerciseResistance TrainingAdultHumansMaleYoung AdultPlyometricpowerreactive strengthsquatstretch-shortening cycleT-test

Identifiers

PMID40046213
PMCPMC11877295

What Socratic holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.