The forehand loop drive is one of the primary attacking techniques in table tennis and is practiced at a large volume during training. The aim of this study was to investigate the energetic profile of the high-repetition forehand loop drive practice in table tennis. Twenty-six well-trained, young table tennis players performed a treadmill graded exercise test to determine their peak oxygen uptake as a measure of overall cardiorespiratory fitness and an incremental table tennis stroke test with 3-min intervals during the forehand loop drive with a ball-throwing robot at a frequency of 35 to 85 strokes∙min⁻¹. Pulmonary and blood parameters were measured and analyzed with a portable spirometry system and a blood lactate analyzer. Energy contributions were calculated from aerobic, anaerobic lactic, and anaerobic alactic pathways for each stroke frequency. Energy cost was defined as the amount of energy expended above resting levels for one stroke. Repeated-measures analyses of variance (ANOVA) with the stroke frequency (35,45,55,65,75, or 85 strokes/min⁻¹) as a within-subject factor were performed for the dependent variables. A Power regression was performed for the energy cost as a function of the stroke frequency. Findings demonstrated a function of Y = 91.566·x^−0.601 where Y is the energy cost and x is the stroke frequency, R² = 0.9538. The energy cost decreased at higher stroke frequencies. The energy contributions from aerobic, anaerobic lactic, and anaerobic alactic pathways at each stroke frequency ranged from 79.4%–85.2%, 0.6%–2.1%, and 12.9%–20.0%, respectively. In conclusion, the energy cost of the forehand loop drive decreased at higher stroke frequencies. The high-repetition forehand loop drive practice was aerobic dominant and the anaerobic alactic system played a vital role.

中文翻译：

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与训练有素的年轻乒乓球运动员一起进行正手环球练习的能量曲线。

正手打环驱动是乒乓球的主要进攻技术之一，在训练过程中被大量练习。这项研究的目的是调查乒乓球中高重复性正手环驱动练习的能量分布。26名训练有素的年轻乒乓球运动员进行了跑步机分级运动测试，以确定其总体摄氧量的峰值氧吸收量，并在正手打球时以3分钟的间隔进行了增量乒乓球击球测试以35至85冲程∙min ^-1的频率投掷机器人。使用便携式肺活量测定系统和血液乳酸分析仪测量并分析肺和血液参数。从每个冲程频率的有氧，厌氧乳酸和厌氧算术途径计算能量贡献。能源成本定义为一次冲程超过静止水平所消耗的能量。对于因变量，以冲程频率（35、45、55、65、75或85冲程/分钟^-1）作为对象内因素，对方差（ANOVA）进行了重复测量分析。针对作为冲程频率的函数的能量成本执行了幂回归。结果表明，函数Y = 91.566·x ^-0.601，其中Y是能源成本，x是冲程频率R ²= 0.9538。在较高的冲程频率下，能量成本降低了。有氧，厌氧乳酸和厌氧乳酸途径在每个冲程频率下的能量贡献分别为79.4％–85.2％，0.6％–2.1％和12.9％–20.0％。总之，在较高的冲程频率下，正手环驱动的能量成本降低了。高重复性的正手环驱动练习是有氧运动的主导，厌氧性算术系统起着至关重要的作用。