Evidence map›Paper›PMID 34450697›Full record

ArticleSensors (Basel, Switzerland)2021

The Effects of Knee Flexion on Tennis Serve Performance of Intermediate Level Tennis Players.

Joana Ferreira Hornestam, Thales Rezende Souza, Fabrício Anício Magalhães, Mickäel Begon, Thiago Ribeiro Teles Santos, Sérgio Teixeixa Fonseca

Abstract read
In one paragraph

Article in Sensors (Basel, Switzerland), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
–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

9 citing papers in PubMed.

  1. Review
  2. Interpretable prediction of knee joint loading during tennis serves based on GNN-GRU model and layer-wise relevance propagation.Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine · 2025
    Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Review
  8. Article
  9. 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

6 authors.

Joana Ferreira HornestamGraduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil.
Thales Rezende SouzaGraduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil.
Fabrício Anício MagalhãesGraduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil.
Mickäel BegonSchool of Kinesiology and Exercise Sciences, Faculty of Medicine, Université de Montréal, Montreal, QC H3C 3J7, Canada.
Thiago Ribeiro Teles SantosGraduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil.ORCID 0000-0003-2395-2023
Sérgio Teixeixa FonsecaGraduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil.

Funding

Conselho Nacional de Desenvolvimento Científico e Tecnológico 000Coordenação de Aperfeiçoamento de Pessoal de Nível Superior 001Coordenação de Aperfeiçoamento de Pessoal de Nível Superior 88887.364812/2019-00Fundação de Amparo à Pesquisa do Estado de Minas Gerais 000
6 · The paper itself

Abstract

This study aimed to investigate the effects of knee flexion during the preparation phase of a serve on the tennis serve performance, using inertial sensors. Thirty-two junior tennis players were divided into two groups based on their maximum knee flexion during the preparation phase of serve: Smaller (SKF) and Greater (GKF) Knee Flexion. Their racket velocity, racket height, and knee extension velocity were compared during the tennis serve. Inertial sensors tracked participants' shank, thigh, and racket motions while performing five first, flat, and valid serves. Knee flexion was analysed during the preparation phase of serve, knee extension velocity after this phase, racket velocity just before ball impact, and racket height at impact. Pre-impact racket velocity (mean difference [MD] = 3.33 km/h,

Indexed as

TennisBiomechanical PhenomenaHumansKnee Jointbiomechanicsinertial sensorsleg drivelower limb driveracket sportserve speed

Identifiers

PMID34450697
PMCPMC8398391

What OpenQuestion holds

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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 OpenQuestion graph.