Background: Participation in on-duty exercise is critical to enhance firefighter safety and readiness. However, these sessions are often interrupted with emergency responses and require firefighters to work in a fatigued state that may increase injury risk.

Objective: To assess the impact of on-duty resistance training on neuromuscular function.

Methods: A sample of 18 firefighters (Age: 38.8 ± 8.0 y; Body fat: 24.9 ± 7.0%) completed three testing sessions, separated by at least 72 h to compare the effects of circuit (CT) versus heavy resistance training (HRT) fatigue on neuromuscular function. During Session 1, anthropometrics and familiarization trials of balance and neuromuscular function were completed, which included single-leg drop landing (SLDL), postural sway (PS), and modified Functional Balance Test (mFBT). Sessions 2 and 3 were randomized, where participants completed either HRT or CT. Isometric midthigh pull (IMTP), long jump (LJ), and lower body power (LBP) tests were conducted pre- and immediately post exercise, whereas static and dynamic balance assessments were conducted pre- and 10 min post exercise to simulate an emergency response time course. Repeated measures ANOVA, effect sizes, and difference scores were used to analyze the effects of condition and time. The level of significance was set at p < 0.05.

Results: CT decreased IMTP, LJ, and LBP, whereas HRT decreased LJ and LBP (p ≤ 0.001, ES ≥ 0.476). Despite several significant condition by time interaction effects on balance outcomes, there were no differences within CT or HRT over time (p ≥ 0.066).

Conclusions: These findings suggest that on-duty resistance training reduces firefighters' power and/or strength immediately post exercise but does not influence most firefighters' balance 10 min post exercise. Thus, firefighters are recommended to perform resistance training on-duty during low emergency call volume times.

Keywords: circuit training; functional balance test; heavy resistance training; isometric midthigh pull; postural control; postural sway; single leg drop landing; time to stabilization.

背景: 参与当值训练对于提高消防员的安全性和备战状态至关重要。然而，这些训练经常因紧急响应而中断，并要求消防员在疲劳状态下工作，这可能会增加受伤风险。

目的: 评估当值阻力训练对神经肌肉功能的影响。

方法: 18名消防员（年龄：38.8 ± 8.0岁；体脂率：24.9 ± 7.0%）完成了三个测试会话，这些会话间隔至少为72小时，以比较循环训练（CT）和重型阻力训练（HRT）对神经肌肉功能的影响。在第一次会话中，进行了身体测量学评估及平衡和神经肌肉功能的适应性试验，包括单腿落地着陆(SLDL)、姿势摇晃(PS)以及改良功能性平衡测试(mFBT)。第二次和第三次会话是随机分配的，参与者完成了HRT或CT。在训练前和训练后立即进行了等长中股拉力（IMTP）、长跳(LJ)和下肢功率(LBP)测试；而在训练前及10分钟后对静态和动态平衡进行了评估以模拟紧急响应的时间进程。使用重复测量方差分析、效应量以及差异评分来分析条件和时间的影响。显著性水平设定为p

结果: CT使IMTP、LJ和LBP下降，而HRT则使LJ和LBP减少（p ≤ 0.001, ES ≥ 0.476）。尽管在平衡结果中有几个显著的条件与时间交互效应，在CT或HRT的过程中没有发现任何变化（p ≥ 0.066）。

结论: 这些研究结果表明，当值阻力训练会立即降低消防员的力量和/或力量，但在紧急响应后的10分钟内不会影响大多数消防员的平衡。因此，建议消防员在呼叫量较低的时间段进行当值阻力训练。

关键词: 循环训练；功能性平衡测试；重型阻力训练；等长中股拉力；姿势控制；姿势摇晃；单腿落地着陆；稳定时间。