Int J Sports Physiol Perform. 2021 May 1;16(5):731-734. doi: 10.1123/ijspp.2020-0558. Epub 2021 Feb 4.
To investigate the relationship between prescribed (preDI), perceived (perDI), and actual delivery intensity (actDI) in cricket pace bowling.
Fourteen male club-standard pace bowlers (mean [SD]: age 24.2 [3.2] y) completed 1 bowling session comprising 45 deliveries. The first 15 deliveries composed the warm-up, where participants bowled 3 deliveries each at a preDI of 60%, 70%, 80%, 90%, and 95%. Bowlers reported the perDI after each delivery. The fastest delivery in the session was used as a reference to calculate relative ball-release speed for the warm-up deliveries, with this measure representing the actDI. Ball-release speed was captured by a radar gun.
For perDI, there was a very large relationship with preDI (rs = .90, P < .001). Similarly, for actDI, there was a large relationship with preDI (rs = .52, P < .001). Higher concordance was observed between perDI and preDI from 60% to 80% preDI. A plateau was observed for actDI from 70% to 95% preDI.
The relationship between perDI and actDI was very large and large with respect to preDI, indicating that both variables can be used to monitor delivery intensity against the planned intensity and thus ensure healthy training adaptation. The optimal preDI that allowed pace bowlers to operate at submaximal perDI but still achieve close to maximal ball-release speeds was 70%. Bowling at the optimal preDI may significantly reduce the psychophysiological load per delivery in exchange for a trivial loss in ball-release speed.
研究板球投球中规定（预 DI）、感知（感知 DI）和实际投球强度（实际 DI）之间的关系。
14 名男性俱乐部标准投球手（平均[SD]：年龄 24.2[3.2]岁）完成了 1 次投球训练，共 45 次投球。前 15 次投球构成热身，其中参与者以 60%、70%、80%、90%和 95%的预 DI 各投 3 次。投手在每次投球后报告感知 DI。会话中最快的投球被用作计算热身投球的相对球释放速度的参考，该测量值代表实际 DI。球释放速度通过雷达枪捕获。
感知 DI 与预 DI 呈非常大的关系（rs =.90，P<.001）。同样，实际 DI 与预 DI 呈大关系（rs =.52，P<.001）。在 60%至 80%的预 DI 范围内，感知 DI 和预 DI 之间的一致性更高。在 70%至 95%的预 DI 范围内，实际 DI 出现平台。
感知 DI 和实际 DI 与预 DI 的关系非常大且较大，表明这两个变量都可用于监测相对于计划强度的投球强度，从而确保健康的训练适应。允许投球手在感知 DI 低于最大但仍能达到接近最大球释放速度的最佳预 DI 为 70%。以最佳预 DI 投球可能会显著降低每次投球的心理生理负荷，而球释放速度仅略有损失。
