Physical activities involving impact loading are important for improving bone strength and mineral density in children. There is little research quantifying impact loads associated with various high-impact activities. Purpose: Examine the magnitude of peak ground reaction forces (pGRF) across different jumping activities in children. Methods: Eight children between 8 and 12 years (9.63 [1.49] y; 1.42 [0.08] m; 33.69 [4.81] kg), performed 5 trials of a broad jump, countermovement jump, jumping jack, leap jump, and drop jump on a force plate. The pGRF were determined during the landing phase of each activity and expressed in units of body weight (BW). A repeated-measures analysis of variance was employed to assess differences in pGRF across activities. Results: Drop jump exhibited the greatest pGRF (3.09 [0.46] BW) in comparison with the vertical jumping jack (2.56 [0.21] BW; P < .001) and countermovement jump (2.45 [0.22] BW; P = .001), as well as the horizontal broad jump (2.25 [0.2] BW; P = .003), and leap jump (2.01 [0.1] BW; P = .002). Conclusion: Peak loads between 2 and 3.1 BW were exhibited across each jump activity, which is moderate compared with magnitudes in most jump interventions seeking to improve bone health. All conditions except drop jump exhibited loading <3 BW, suggesting these activities may not produce sufficient loads to improve bone outcomes.

涉及冲击负荷的体育活动对于提高儿童的骨骼强度和矿物质密度很重要。很少有研究量化与各种高影响活动相关的影响载荷。目的：检查儿童不同跳跃活动中的峰值地面反作用力 (pGRF) 的大小。方法： 8 名 8 至 12 岁的儿童（9.63 [1.49] y；1.42 [0.08] m；33.69 [4.81] kg），进行了 5 次跳远、逆向跳跃、起重跳、跳跃和跳高测力板。pGRF 在每个活动的着陆阶段确定，并以体重 (BW) 为单位表示。采用重复测量方差分析来评估 pGRF 跨活动的差异。结果：与垂直跳跃 (2.56 [0.21] BW; P  < .001) 和反向跳跃 (2.45 [0.22] BW; P  = .001) 相比，下降跳跃表现出最大的 pGRF (3.09 [0.46] BW)，以及作为水平跳远（2.25 [0.2] BW；P  = .003）和跳跃（2.01 [0.1] BW；P  = .002）。结论：每次跳跃活动都表现出 2 到 3.1 BW 之间的峰值负荷，与大多数旨在改善骨骼健康的跳跃干预的量级相比，这是中等的。除跳伞外，所有条件均显示负荷<3 BW，表明这些活动可能无法产生足够的负荷来改善骨骼结果。