London Sport Institute, Middlesex University, Greenlands Lane, London, United Kingdom.
Hong Kong Cricket Association, Hong Kong, China.
J Strength Cond Res. 2021 Apr 1;35(4):941-948. doi: 10.1519/JSC.0000000000003927.
Bishop, C, Weldon, A, Hughes, J, Brazier, J, Loturco, I, Turner, A, and Read, P. Seasonal variation of physical performance and interlimb asymmetry in professional cricket athletes. J Strength Cond Res 35(4): 941-948, 2021-The aims of this study were to: (a) determine the seasonal variation of physical performance in professional cricket players and (b) determine the seasonal variation of interlimb asymmetries in the same cohort of professional players. Fifteen male professional cricket players (age: 20.60 ± 1.59 years; height: 1.82 ± 0.08 m; and body mass: 78.70 ± 11.23 kg) performed unilateral countermovement jumps (CMJs), unilateral drop jumps, 10 m sprints and 505 change of direction (COD) speed tests at pre (March), mid (June), and end (September) of the 2018 season. Interlimb asymmetry was quantified in the unilateral CMJ (jump height and concentric impulse), unilateral drop jump (jump height and reactive strength index [RSI]), and 505 (total time and COD deficit). Significant changes (p < 0.05) were evident for the following tests: unilateral CMJ (effect size [ES] range = 0.67-1.00), 505 on the right leg (ES = 0.70), 10 m (ES range = -1.39 to 0.70), and COD deficit (ES range = 0.70-0.80), with the largest changes evident for 10-m sprint. No significant differences were evident in drop jump performance throughout the season. For the magnitude of asymmetry, significant changes in jump height asymmetry from the unilateral CMJ were evident from mid to end of season (ES = 0.72). For the direction of asymmetry, levels of agreement ranged from poor to substantial in the unilateral CMJ (kappa = -0.21 to 0.72), fair to substantial in the unilateral drop jump (kappa range = 0.33 to 0.74), and slight to moderate during the 505 test (kappa range = 0.06 to 0.44), with RSI showing noticeably better results than other tests or metrics. These data show that the largest changes in performance scores throughout the season came from the 10-m test, which practitioners may wish to consider implementing if not doing so already. Furthermore, both unilateral jump tests showed their use for asymmetry interpretation, which practitioners may wish to consider implementing in to their test batteries. Specifically, jump height asymmetry during the unilateral CMJ was the only metric to exhibit meaningful changes between time points, whereas RSI was the metric that exhibited more consistent limb dominance characteristics for the direction of asymmetry.
毕晓普、韦尔登、休斯、布赖泽、洛图尔科、特纳和里德。职业板球运动员的身体表现和肢体不对称季节性变化。J 力量与调节研究 35(4)：941-948，2021-本研究的目的是：(a)确定职业板球运动员身体表现的季节性变化；(b)确定同一批职业运动员肢体不对称的季节性变化。15 名男性职业板球运动员(年龄：20.60±1.59 岁；身高：1.82±0.08 m；体重：78.70±11.23 kg)在 2018 赛季的赛前(3 月)、赛中(6 月)和赛后(9 月)进行了单侧反跳(CMJ)、单侧跳落、10 m 冲刺和 505 变向(COD)速度测试。在单侧 CMJ(跳跃高度和向心冲量)、单侧跳落(跳跃高度和反应强度指数[RSI])和 505(总时间和 COD 不足)中量化了肢体不对称。以下测试有明显变化(p<0.05)：单侧 CMJ(效应量[ES]范围=0.67-1.00)、505 右侧腿(ES=0.70)、10 m(ES 范围=-1.39 至 0.70)和 COD 不足(ES 范围=0.70-0.80)，10 m 冲刺的变化最大。整个赛季跳落表现均无显著差异。对于不对称的幅度，单侧 CMJ 的跳跃高度不对称从赛中到赛后有明显变化(ES=0.72)。对于不对称的方向，单侧 CMJ 的一致性程度从差到适度(kappa=-0.21 至 0.72)，单侧跳落的一致性程度从一般到适度(kappa 范围=0.33 至 0.74)，505 测试的一致性程度从轻度到中度(kappa 范围=0.06 至 0.44)，RSI 的结果明显优于其他测试或指标。这些数据表明，整个赛季的表现得分最大变化来自于 10 m 测试，如果实践中尚未实施，从业者可能希望考虑实施该测试。此外，两项单侧跳跃测试都显示出了其在不对称解释方面的用途，从业者可能希望考虑将其纳入他们的测试组合中。具体来说，单侧 CMJ 期间的跳跃高度不对称是唯一表现出有意义的时间点变化的指标，而 RSI 则是表现出更一致的肢体优势特征的指标，用于表示不对称的方向。
