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In the field a chronometer on the bow gives a repeatable measure of an interval that closely follows the reaction to the clicker

1 study · 20 archers measured

ForContextAgainst200520102015202020252005, for, n = 202005, context, n = 20
Each circle is a study: its position gives the year, its row whether it is for, against or context, its size how many participants it measured. Light circles are studies on other populations or without archers.

There is a single validation study, carefully done. A chronometer mounted on the bow, which starts when the clicker drops and stops when the arrow tip passes a sensor on the handle, was compared with forearm electromyography in twenty archers from the Turkish national team and its candidates, twelve arrows each. The two times go together, with a correlation of 0.787, but they do not coincide: the chronometer gives a mean of 177 milliseconds and the electromyography 146, because the former also includes the start of the fingers opening and the centimetre and a half the tip travels to the sensor. On the field, at 70 metres, the measurement repeats almost exactly a week later, 180 and 179 milliseconds, with an intraclass correlation coefficient of 0.985. What can be measured well in the field, then, is an interval that closely follows the reaction to the clicker, not the reaction itself; and the evidence comes from a single laboratory, on elite archers, with a prototype whose 150 gram sensor on the handle might itself change the shot.

Also phrased as: "measuring clicker reaction time"; "clicker chronometer"; "clicker to release time without a lab"; "clicker reaction in the field"

In practice

On the range the time between the click and the release is timed with cameras, microphones or apps, and that number is readily called the archer's reaction time to the clicker.

Evidence

  • 2005
    For Archers Published later

    20 elite Turkish archers from the national team and its candidates, 10 women and 10 men, half of them juniors, 12 arrows each in the laboratory: the chronometer time, from the clicker dropping to the tip passing the sensor on the handle, correlates with the reaction time derived from electromyography of flexor digitorum superficialis and extensor digitorum (r = 0.787; p < 0.01).

    Reliability and validity testing of an archery chronometer · Hayri Ertan, Behzat B. Kentel, S. Turgut Tümer, Feza Korkusuz

  • 2005
    For Archers Published later

    The same archers, 12 arrows at 70 m repeated a week later in the same shooting order: the time measured by the chronometer repeats almost exactly, 180 and 179 milliseconds in the two sessions (ICC 3,1 = 0.985; 95% confidence interval 0.962 to 0.994; difference between sessions p = 0.536).

    Reliability and validity testing of an archery chronometer · Hayri Ertan, Behzat B. Kentel, S. Turgut Tümer, Feza Korkusuz

  • 2005
    Context Archers Published later

    The two measures do not coincide: 177 ± 55 milliseconds with the chronometer (range 102 to 502) against 146 ± 47 with electromyography (range 88 to 342), a significant difference (p = 0.027) over 240 arrows. The gap of about three hundredths is the first part of the fingers opening plus the travel of the tip to the sensor, a centimetre and a half: the chronometer measures a response time, not the pure reaction. The sensor weighs 150 grams and sits on the handle, and no comparison with and without the device is reported.

    Reliability and validity testing of an archery chronometer · Hayri Ertan, Behzat B. Kentel, S. Turgut Tümer, Feza Korkusuz

Status history

  1. 2005 Reported A chronometer mounted on the bow, which starts with the clicker and stops when the tip passes a sensor on the handle, is compared with electromyography in twenty elite archers: the two measures go together, with a correlation of 0.787, and on the field at 70 metres the value repeats almost exactly a week later. The chronometer reads about three hundredths longer, because it also includes the start of the finger movement. It is a single validation study: reported.

Related

Research lines

Cite
APA

Campagna, M. (2026). In the field a chronometer on the bow gives a repeatable measure of an interval that closely follows the reaction to the clicker (Version 2). In Evidence Registry. Retrieved 16 October 2026, from https://matteocampagna.com/en/registry/technique/field-chronometer-clicker-release

BibTeX
@misc{campagna2026_cronometroclickermisura,
  author = {Campagna, Matteo},
  title = {In the field a chronometer on the bow gives a repeatable measure of an interval that closely follows the reaction to the clicker},
  year = {2026},
  howpublished = {Evidence Registry, matteocampagna.com},
  url = {https://matteocampagna.com/en/registry/technique/field-chronometer-clicker-release},
  note = {Version 2; accessed 2026-10-16}
}

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