I have not seen Garmin or anyone else discuss this, but it seems to me that the Garmin HRM strap averages my HR over a couple of minutes. I've attached two HR screen captures: one using just my Garmin Swim 2 watch and one using the HRM strap. These are typical of many others lap-swimming sessions. HR is the bottom red trace, and SWOLF is included just to show the interval of each lap. Total time shown is about 7 minutes for each. Notice that the Swim 2 by itself reports peak HR toward the end of each lap, as I'd expect. The HRM reports a slowly rising HR, with very little variation. It reaches a fairly steady level in 3min 20sec, and takes about 2min to get half-way there, which suggests to me that it is averaging the HR it measures for a time of order 2 minutes.
It would be interesting to hear about this from Garmin or from other users. Even for long-distance running, I would think the user would like to know how their HR changes during short spurts of effort. I'll be primarily using my SWIM 2 for swimming HR.
BTW, Garmin claims that the HRM strap is more accurate than the Swim 2 by itself, and it makes the Swim 2 switch to the HRM if it is available. This is probably because it is notoriously difficult to get a reliable HR measurement while swimming. For example, the Polar H10 shorts out in a salt water pool (see my H10 review). I find that if put the Swim 2 on fairly tightly (as recommended by Garmin), the HR readings are reasonable and reproducible. I had hoped that the H10 would provide a simultaneous measurement to compare with the Swim 2, but no luck there.
| 商品尺寸 | 144.78 x 3.81 x 1.27 cm; 72.57 克 |
|---|---|
| 颜色 | 蓝色 |
| 尺寸 | 均码 |
| 产品系列名称 | HRM- Swim |
| 运动类型 | Wireless |
| 本商品是否包含电池 | 是 |
| 是否需要电池 | 是 |
| 适用性别 | Unisex |
| 型号年份 | 2015 |
| 商品特征 | 无线, Monitor, fitness |
