Table 1.
Comparison of Actiheart and ActiTrainer Monitors
| Actiheart | ActiTrainer | |
| Components | Single-unit that includes a main sensor and left lead connected by a 100mm. wire | Polar T31 adjustable heart rate transmitter strap; accelerometer unit |
| Size | Main sensor — Thickness: 0.7 cm., Diameter: 3.3 cm. Left lead — 0.5 × 1.1 × 2.2 cm. |
Accelerometer — Thickness: 1.52 cm., Width: 8.56 cm., Height: 3.81 cm. Heart rate transmitter strap — 25–33 in. (+25% stretch capability) |
| Weight | 10 g. | Accelerometer unit: 48 g. Heart rate transmitter strap: 2.3 oz. |
| Storage Capacity | 128kb (15 days with 60s epochs) | 1MB (∼59 days with 60s epochs) |
| Rechargeable Battery | 17 mAh Lithium; 3.0 volt Life: ∼14 days continuous wear Recharge Time: 11 hrs |
400 mAh Lithium; 4.18 volt Life: ∼7–10 days for daytime only wear (depends on LED setting) Recharge Time: 2.5 hrs |
| Accelerometer frequency range | 1–7 Hz | 0.25–2.5 Hz |
| ECG sampling frequency | 128 Hz | NA |
| Measurable heart rate range | 31–250 bpm | 40–220 bpm |