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Difference in racket head trajectory and muscle activity between the standard volley and the drop volley in tennis.
Furuya, Ryosuke; Yokoyama, Hikaru; Dimic, Milos; Yanai, Toshimasa; Vogt, Tobias; Kanosue, Kazuyuki.
  • Furuya R; Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
  • Yokoyama H; Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo, Japan.
  • Dimic M; Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
  • Yanai T; Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
  • Vogt T; Institute of Professional Sport Education and Sport Qualifications, German Sport University Cologne, Cologne, Germany.
  • Kanosue K; Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
PLoS One ; 16(9): e0257295, 2021.
Article in English | MEDLINE | ID: covidwho-1410610
ABSTRACT
Among tennis coaches and players, the standard volley and drop volley are considered basically similar, but muscles need to be relaxed (deactivation) just at the moment of impact when hitting the drop volley. However, this is not evidence-based. The aim of this study was to clarify racket head trajectory and muscle activity during the drop volley and to compare them with those of the standard volley. We hypothesized that 1) the racket head would move less forward for the drop volley than for the standard volley and 2) the wrist and elbow muscles be relaxed for the drop volley at the time of ball impact. Eleven male college students with sufficient tennis experience volunteered to participate in this study. Wireless EMG sensors recorded activation of the four arm muscles. Each subject performed the standard volley or the drop volley with both a forehand and a backhand from a position near the net. Four high speed video cameras (300 Hz) were set up on the court to measure ball speed and racket head trajectory. Returned ball speed of the drop volley was significantly lower than that of the standard volley (p < 0.05). The racket head moved less forward than in the standard volley, supporting the first hypothesis. Muscle activity of the drop volley, just before and after ball impact for both the forehand and backhand, was lower than that of the standard volley. However, the activity was in the form of a gradual increase as impact time approached, rather than a sudden deactivation (relaxation), which did not support the second hypothesis. For the drop volley, lower muscle activity in the forearm enabled a softer grip and thus allowed a "flip" movement of the racket to diminish the speed of the returned ball.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tennis / Muscle, Skeletal Type of study: Experimental Studies Limits: Adult / Humans / Male / Young adult Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2021 Document Type: Article Affiliation country: Journal.pone.0257295

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tennis / Muscle, Skeletal Type of study: Experimental Studies Limits: Adult / Humans / Male / Young adult Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2021 Document Type: Article Affiliation country: Journal.pone.0257295