Lower-limb activity during the power serve in tennis: Effects of performance level

Olivier Girard, Jean Paul Micallef, Gregoire P. Millet

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)


Purpose: The aim of the present study was to investigate the differences in lower-limb activity during the tennis power serve between players of different performance levels. Methods: Thirty-two participants distributed in three groups (beginner, B; intermediate. I; elite, E) performed countermovement jumps to measure leg power (Pmax) and 15 power serves from a force platform. Lateral, horizontal, and vertical forces (Fx, Fy, and Fz) were sampled simultaneously with EMG signals from six leg muscles. Racquet-ball impact height (Iheight) and maximum velocity of the ball (Vmax) were measured with video analysis and radar, respectively. The total duration of the serve was fractioned into four phases: preparation (Pre), eccentric (Ecc), concentric (Con), and suspension (Sus). Results: Pmax was similar in the three groups. The duration of Pre was longer (P < 0.05) in E than in B, whereas Con was shorter (P < 0.05). Vmax (169.4 ± 11.3 vs 107.2 ± 6.1 km·h-1, P < 0.001), Iheight (149.2 ± 2.7 vs 142.6 ± 4.7% of standing height, P < 0.05), and Fzmax (2.12 ± 0.36 vs 1.68 ± 0.33 of body weight, P < 0.01) were higher in E than in B. Iheight was correlated (r = 0.85, P < 0.001) with Fzmax in E. Peaks EMG occurred earlier (P < 0.05) in E (79 ± 17% of Con) than in other groups (B: 94 ± 11% and I: 94 ± 15%). Conclusion: The vertical forces and coordination in lower extremities during the tennis serve were different between players of different skill levels but with the same Pmax. This may partly explain the differences in serve efficiency.

Original languageEnglish
Pages (from-to)1021-1029
Number of pages9
JournalMedicine and Science in Sports and Exercise
Issue number6
Publication statusPublished - 1 Jun 2005
Externally publishedYes


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