Cadence (steps/min) and relative intensity in 61 to 85-year-olds: the CADENCE-Adults study

Table 4 Heuristic cadence thresholds (steps/min) for relatively-defined moderate and vigorous intensity based on segmented regression and ROC curve analyses

Intensity Level	Intensity Indicator	Measure
Moderate Intensity Heuristic Threshold: ≥ 105 steps/min	≥ 64%HR_max	Se	63.6
		Sp	75.8
		PPV	59.0
		NPV	79.1
		Accuracy	71.5
	≥ 40%HRR	Se	74.0
		Sp	77.7
		PPV	59.5
		NPV	87.1
		Accuracy	76.5
	≥ 12 RPE	Se	64.7
		Sp	77.8
		PPV	63.8
		NPV	78.5
		Accuracy	72.9
Vigorous Intensity Heuristic Threshold: ≥ 115 steps/min	≥ 77%HR_max	Se	60.0
		Sp	82.7
		PPV	14.2
		NPV	97.7
		Accuracy	81.6
	≥ 60%HRR	Se	80.8
		Sp	83.8
		PPV	19.8
		NPV	98.9
		Accuracy	83.6
	≥ 14 RPE	Se	63.2
		Sp	84.0
		PPV	22.6
		NPV	96.8
		Accuracy	82.5
Vigorous Intensity Heuristic Threshold: ≥ 120 steps/min	≥ 77%HR_max	Se	28.2
		Sp	97.2
		PPV	84.6
		NPV	71.1
		Accuracy	72.7
	≥ 60%HRR	Se	61.5
		Sp	90.6
		PPV	24.6
		NPV	97.9
		Accuracy	89.3
	≥ 14 RPE	Se	50.0
		Sp	91.0
		PPV	29.2
		NPV	96.1
		Accuracy	88.2

Trade-offs in terms of Sensitivity (Se), Specificity (Sp), Positive Predictive Value (PPV), Negative Predictive Value (NPV), and overall accuracy between the thresholds derived from the segmented regression and the Receiver Operating Characteristic (ROC) curve analyses were considered.

ISSN: 1479-5868