Arrows released during diastole score higher

The summary today

Only one study has actually compared diastole with systole, and it finds a small advantage. In thirty-six Japanese archers at 50 m, arrows released in diastole score on average about half a point more than those released in systole (7.3 against 6.8 with no external cue), and the same effect turns up in a second group of twelve university archers in the same paper. With no cue the release falls at random relative to the heartbeat, almost half in systole and half in diastole; listening to their own heartbeat through headphones the archers release far more often in diastole and the total for six arrows rises by about two points (from 42.3 to 44.4), while a metronome in place of the heartbeat changes nothing. The oldest study of cardiac phase does not help decide: in four elite archers the good arrows leave clustered at two points of the cycle, at the heart's maximum contraction (the ST segment, in systole) or at its maximum relaxation (mid-cycle, in diastole). The picture stays limited: a single research group, six arrows per condition in a regional journal, and with the heartbeat in headphones the phase of the release and the regularity of shot timing change together, so it is not known which of the two brings the points.

Also phrased as: "releasing between heartbeats"; "shooting in diastole"; "the heartbeat disturbs the aim"; "timing the release to the heart"; "cardiac phase and accuracy"

Evidence

• 1990
  Context Archers Published later

  4 elite archers recorded in two sessions, 240 arrows of which 164 were good: the release of the good arrows falls clustered in two phases of the cardiac cycle, the ST segment, that is maximum contraction, or mid-cycle, that is maximum relaxation (chi-square, p < 0.0001), while average and poor arrows leave scattered at random. The authors read the two phases as systole and diastole: the study does not rank one above the other, so it does not say whether diastole is worth more.

  Fine Body Movements and the Cardiac Cycle in Archery · David Keast, Bruce Elliott

• 2009
  For Archers Published later

  36 experienced Japanese archers, 27 men and 9 women aged 16 to 24, six arrows at 50 m per condition, with and without their own heartbeat in headphones in counterbalanced order: average score per arrow without headphones 6.8 ± 2.3 in systole and 7.3 ± 1.9 in diastole, with headphones 6.9 ± 2.3 and 7.6 ± 1.8; effect of phase F(1,134) = 15.68, p < 0.001, with no interaction with condition. In the second experiment of the same paper, 12 male university archers with a metronome in place of the heartbeat, the effect of phase appears again (F(1,140) = 7.44, p < 0.01). Regional journal.

  Physiological and Psychological Changes Caused by Archery Athletes Monitoring Their Own Heartbeat in Shooting Situation, and the Effects on Performance · Hideaki Takai, Osamitu Saijyo, Yasuhisa Kusumoto

• 2009
  Context Archers Published later

  With no cue the release falls at random relative to the cardiac cycle: 102 arrows in diastole and 114 in systole out of 216. With the heartbeat in headphones this becomes 139 and 77 (McNemar, chi-square = 13.09, p < 0.001), the total for six arrows rises from 42.3 ± 7.2 to 44.4 ± 6.2 (t(35) = 3.12, p < 0.005) and shot timing varies less (t(35) = 3.48, p < 0.001). In the second experiment, with a metronome in place of the heartbeat, neither the phase of the release nor the total score changes. The gain with the heartbeat in headphones comes with two changes at once, and the study does not separate them.

  Physiological and Psychological Changes Caused by Archery Athletes Monitoring Their Own Heartbeat in Shooting Situation, and the Effects on Performance · Hideaki Takai, Osamitu Saijyo, Yasuhisa Kusumoto

Status history

1. 1990 Not studied The first study to look at the phase of the cardiac cycle at the moment of release, four elite archers and 240 arrows, finds the good arrows clustered at two points of the cycle, the heart's maximum contraction (the ST segment, in systole) or its maximum relaxation (mid-cycle, in diastole), while average and poor arrows leave at random (chi-square, p < 0.0001). It shows that good arrows leave at a consistent moment of the heartbeat, not that diastole is worth more than systole: on this question there is still no evidence.
2. 2009 Reported The first direct comparison arrives. Thirty-six Japanese archers at 50 m, with and without their own heartbeat in headphones: arrows released in diastole score 7.3 points against 6.8 for those in systole, and the effect of phase holds up in the analysis (F = 15.68, p < 0.001); a second group of twelve university archers in the same paper finds it again. With the heartbeat in headphones more arrows go in diastole and the total rises from 42.3 to 44.4 points over six arrows, but at the same time shot timing becomes more regular, so the gain cannot be put down to phase alone. One study on archers, with six arrows per condition and in a regional journal: reported.

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