Imagine you're a police officer in a tactical group, facing the toughest and riskiest situations. Your heart rate (HR) is usually what's measured to see how hard you're working. But there's another tool that might be better at showing your overall stress level – heart rate variability (HRV). This study looked at whether HRV is more sensitive than HR at monitoring the workload during crucial police selection activities. It involved six male candidates doing a specialist police selection course. Researchers tracked their HR and HRV with ambulatory electrocardiograms. They also tested the candidates' aerobic fitness with a beep test. Here's what they found: while HR stayed pretty normal, HRV showed signs of being depressed, which could mean overstress. Interestingly, the fitter the candidate, the higher their HRV. But when they looked at the relationship between HR, HRV, and fitness, they didn't find any significant connections. So, what does this mean? It seems like HR might not be enough to show the full picture of stress during tasks that combine physical effort with mental strain in tough conditions. HRV could offer more insights, but we don't yet know if it's fitness that influences HRV or the other way around.

Why HRV Matters: Unveiling Stress in Police Selection

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