Garmin | Firstbeat Physiology Insights - A Detailed Look at Each One

You get all this clever stuff thrown into your top-end Garmin watch, as shown in the image from Firstbeat. And it is clever. I'll talk about the more interesting features in more detail further below. Be mindful that optical HR from the wrist might affect the accuracy of the data Firstbeat has to work with, as might incorrect input data of any sort (power, pace, etc.). Any HR data inaccuracies should be rectified by a chest strap, and most newish chest straps should also produce HRV data that some of the Firstbeat algorithms like/need in any case. Recommended: Garmin Fenix 7 Review I'll talk a bit more about some of these features below, and much of this section is co-authored by HB at Firstbeat. i.e., it should be correct ;-) Garmin Real-Time Performance Condition - an explainer Like the analysis behind VO2max, Performance Condition looks at the relationship between your running speed (or cycling power) and heart rate. You are sometimes prompted with your Performance Condition about 5 or 6 minutes into a run, but you can also display it continuously as a data metric and/or analyse it afterwards. Using your VO2max as a baseline, Performance Condition tells you how your current run stacks up against expectations. Early in your run, your Performance Condition is likely to reflect on your level of recovery or a handful of external factors. As your run progresses, decreases in Performance Condition will likely match up with the onset of fatigue and your body working harder to keep pace with your fresher self. Further below, we have a long Z2/Z3 hour bike ride (based on power meter data) following a swim. I'm not sure if this is how a Performance Condition chart is meant to be. 4 hours seems to mark a turning point in performance as fatigue sets in. Here, a different run is taken from CONNECT. I'm not sure you can infer anything from it. My performance condition definitely reflected that I started to struggle after about an hour due to a heavy week, although my power and HR levels stayed in sync. [caption id="attachment_39413" align="aligncenter" width="2319"] Aerobic Running + Performance Condition, HR+Power Overlain[/caption] Firstbeat Factette: The first Garmin device with Performance Condition was the Forerunner 630 (2015) You might choose to monitor PC during a run or ride and 'go for it' when PC values are positive. As the PC figures decline throughout a session then you might get to the point where you curtail the hard stuff. [caption id="attachment_42555" align="aligncenter" width="1595"] Respiration Rate & Performance Condition in GC[/caption] When values at the start of a run/ride are more extreme, say +6 or -6, they clearly reflect my feeling about my own readiness. However, as values hover between +/-2, then I'm not sure I can read too much into the data. I usually notice a warming-up factor where it takes a while for the PC to peak. I'm not so sure it's meant to do that. Usefulness?: 7/10. It's one of those 'interesting things' that pops up, which you might occasionally take into account as your workout progresses. I haven't yet got much back from looking at this bit of data, trended over a run/ride in real time, and I'm not yet convinced about its true accuracy. Garmin Training Status - An Explainer I've got to like this dashboardesque feature the more I glance at it. It combines the insights of Training Load and VO2max to reveal the relationship between your activities and your personal fitness level. The feedback it offers lets you evaluate the effectiveness of your programs and routines, understand where you are in a training cycle, and learn how your body responds. If you are following a proper training plan geared towards a specific race, then Training Status may be a good check of how well the plan is working for you. If 'Peaking' unexpectedly appears, get down to your local parkrun promptly and run really fast ;-) Firstbeat Factette: The first Garmin devices with Training Status were the Fenix 5 & Forerunner 935 (2017) Usefulness?: 7/10. It's kinda interesting to see what Firstbeat think. But, to me, the usefulness of this stat comes in more as an alerting mechanism eg if my fitness or training load were falling when my plan says they should not be. That rarely happens, but when it does, it is important to address it promptly. Perhaps if you were 'randomly training' rather than following a plan, this feature would be much more useful. Garmin Recovery Time Advisor - An Explainer Another EPOC-based metric, Recovery Time, assesses the degree of homeostasis disturbance resulting from your most recent effort, combined with the amount of time remaining on your recovery clock, to predict when your body will have completed the work or restoration and adaptation. One popular misconception regarding Recovery Time feedback is that it should hit zero before your next session. What it’s really telling you is how long it will be before your body is ready to benefit from a tougher, fitness-improving workout. What’s a fitness-improving workout? Essentially, we’re talking about sessions with an Aerobic Training Effect of 2.5 and above. Lighter efforts are a good way to promote recovery, as long as you don’t overdo it. Recovery Time estimates have been updated for the Fenix 6 based on the latest sports science. This means adjustments are made based on your acute/chronic training load ratios, and additional care is taken to ensure adequate recovery after workouts that produce Training Effect scores significantly exceeding those of your normal training efforts. This will usually pop up at the end of your run. It will NOT be stored in your workout history, as, for example, your recovery time will have changed by then. Firstbeat Factette: The first Garmin device with Recovery Time was the Forerunner 620 (2014) For a full technical breakdown of how Recovery Time is calculated, what affects it, and which devices support it, see the Garmin Recovery Time reference page Usefulness? 9/10 I don't treat this measure as the 'truth', but I certainly take it into account when training frequently. For example, if I do an evening workout and I get a recovery time of 21 hours, then I may delay any workout scheduled for the following morning. For the sake of a 5-second glance at the end of your workout, this is 5 seconds well-spent. You can always ignore what it says VO2max - An Explainer A higher VO2max makes sport AND THE PHYSICAL RIGOURS OF LIFE easier. Sometimes us sporty people forget that. [caption id="attachment_28492" align="aligncenter" width="2048"] I've had 65 in a lab a couple of years ago and sometimes Garmins give me as low as 50. Do I think it's really higher? Of course, everyone does ;-)[/caption] VO2max is a relatively definitive metric of fitness. Improving it should indicate you are potentially faster, but, critically, it does not take into account the economy of your technique. So we could both have a RUNNING VO2max of 60, but if your running gait is more efficient than mine, then it's very likely you'll beat me in a 5k. Maintaining your VO2max can also reduce the physiological impact of stress, make it easier to recover, and can help stave off the effects of ageing. I am somewhat intrigued by why Garmin/Firstbeat display daily trends in VO2max. For me, these values can vary quite a bit...say by 5 percentage points. This clearly DOES NOT reflect the reality of what my VO2max actually is, as VO2max is a relatively slowly changing state. So, perhaps, what Fristbeat/Garmin are showing is my effective performance stated in VO2max equivalence terms??? IDK. You can't generally do anything with VO2max. It's a marker of your progression or badge of honour, depending on how you want to see it. Whilst Garmin says the high 50s are 'superior', I would say that decent athletes will generally have values in the high 60s or higher. Firstbeat Factette: The first Garmin Device with VO2max detection was the Forerunner 620 (2013) Usefulness? 5/10. In itself, I would take this measure with a pinch of salt until it stabilises after a few weeks. Even then, it's pointless to regularly look at BUT perhaps helpful to know when a specific workout indicates you are performing at a higher/PB VO2max level. The REAL usefulness of these measures is that much of the other Firstbeat stuff is derived from them. https://the5krunner.com/2023/03/26/garmin-vo2max-how-to-make-it-higher/ Heat & Altitude Acclimatization - VO2max & TRAINING STATUS adjustments The impact of environmental factors is brought into focus with the addition of acclimatization tracking. You will be able to watch as your physiology adapts to help you perform better in higher elevations or in ways that help you manage the effects of hotter, more humid climates. This information is also factored into your performance analytics so that a decrease in performance capability attributable to your environment isn’t mistakenly attributed to unproductive training activities or poor recovery. You will not normally see temperature acclimation or altitude acclimatisation unless you stray above 22ºC (72ºF) or an altitude of 800 m (2625 ft.) - 4000m. The altitude readings are triggered by your Fenix 6 but the temperatures are triggered from weather services via your Connect app. [gallery size="medium" columns="2" link="file" ids="42213,42194"] You can see the SUN icon indicating that temperature acclimation is active. Full adaptation to these conditions will take you at least 4 days. In these conditions, your VO2max and TRAINING STATUS screen, further below, are slightly modified. Usefulness? 6/10: I can see how this feature might be useful to a select number of athletes who specifically use altitude training. Perhaps more useful to mere mortals will be heat acclimation for hot summer races? Garmin Training Effect - An Explainer The two Training Effect metrics are important and, in my experience, they seem to reflect well the session I've just completed. The aerobic score responds to sustained effort and duration; the anaerobic score responds to short, maximal intervals of 10 to 120 seconds. For a full technical explanation of how both scores are calculated, what the 0–5 scale means, and which devices support the feature, see the Garmin Training Effect reference page. Firstbeat Factette: The first Garmin device with (Aerobic) Training Effect was the Forerunner 610 (2011, TE) Firstbeat Factette: The first Garmin device with Anaerobic Training Effect was the Fenix 5 (2017) TE can also be shown as an accumulating metric throughout your workout. Other vendors (eg Suunto) have introduced adaptive workouts that target TE goals and curtail the workout once you have achieved the goal. Training Effect & Workout Labels The two Training Effect measures are combined on one summary screen to which is added the WORKOUT LABEL (shown as TEMPO in the image below, in orange). And then there are further screens (not shown) where a little more commentary is added about each training effect. Usefulness? 9/10: I really like these screens and the data they give. The three metrics AnTE, AeTE and Workout labels give me a NICE summary of my workout. Sure it usually coincides with how I feel and what I know I have planned to do but sometimes it's just nice to have someone else agree with you ;-) If anything the workout feedback tells me that the session should feel easier than what it did...aka I'm not trying hard enough sometimes. Garmin Training Load - An Explainer If you trained with me then, for sure, I would be looking at your Training Load (TL). It's important. Whilst TL is still more complex than the limited view presented by the Firstbeat metric, this is still a great place to start to understand more about the effect of your training. Long runs, tempo runs, intervals, cycling, going to the gym? Mix things up, it doesn’t matter. Firstbeat's Training Load reveals the combined physiological impact of all your activities in the past 7 days. As you can see from the image, it looks like the LOAD is also split each day and colour coded according to the training zone (sort of) - see next section! What are the numbers? Your Training Load is 'simply' the sum of the EPOC values of your activities. EPOC is used to describe homeostasis disturbance and when placed into the context of your fitness level (VO2max) and activity history also provides the basis for your Training Effect. In the world of elite sport, sports scientists are increasingly turning to this type of training load data to help athletes reduce injuries through smart application of load over time. Firstbeat Factette: Training load for cycling requires a power meter. Firstbeat Factette: The first Garmin devices with Training Load were the Fenix 5 & Forerunner 935 (2017) Usefulness?: 7/10. Training Load is super-important to me. Maybe I'm biased or blinkered in that respect. It seems to me that the Training Load info given here is a bit lacking on insight and actionability. Give me more (please) Training Load Balance aka Training Load FOCUS [caption id="attachment_39407" align="alignright" width="243"] 945 Shown[/caption] This looks at how you have invested your time across the training 'zones' (Anaerobic, high aerobic, low aerobic) AND it puts a little oval to show you the Goldilocks zone - the OPTIMAL area. Again, this is a backwards-looking measure which is nice enough. But I would like to see more actionability to answer the 'So What' question. How should my load be split over the coming few days? A recommendation just for tomorrow would be great although it is nice that the Fenix 6 gives you a broad textual 'steer' on what to do next (see image) Usefulness? 7/10. Both useful and, yet, could be more precise & useful when looking forward Garmin Lactate Threshold - An Explainer This is the only training metric onboard the Fenix 6 that requires that you have your watch paired with a chest belt. This feature uses Heart Rate Variability (HRV) data captured across a range of intensities to identify your lactate threshold. Your lactate threshold responds to training, meaning you can improve it by challenging yourself in the right way. Once your device has detected your lactate threshold, you have a chance to use this information to personalise your heart rate zones based on your situation. You will get a Lactate Threshold heart rate AND and Lactate Threshold pace. If you are not so fit then you might be able to maintain this for about 40 minutes but the fitter you get the longer you can maintain it for ie WELL over an hour. For me, it's not quite my half-marathon pace, if I only run-trained I reckon it would be my HM pace. I think the LTHR may be slightly over-estimated by a few BPMs based on lab tests. Don't forget that your HR zones may well be best determined by basing them on LTHR rather than HRmax. Firstbeat Factette: The first Garmin device with Lactate Threshold was the Forerunner 735xt (2016) Usefulness? 9/10. I'm a little concerned about the accuracy (based on the last 2 years across many devices). Wannabe athletes REALLY need to look at and understand AeT and AnT/LTHR. It's fundamental for how you can perform. Garmin FTP - An Explainer Cyclists all know that FTP is pretty useless. Haha. Just kidding. A whole sub-industry has been built up around FTP. I use power and FTP a LOT but don't be taken in by the glitzy catch-all it seems to be. Read around to understand it, then Google XERT and switch on the lightbulb. Your Functional Threshold Power (FTP) for cycling represents the highest, constant level of power that you can produce whilst not accumulating lactic acid. It's probably NOT 60 minutes for most of us...probably less. Maybe higher for those who are well-trained. Regardless of that, we tend to say it's your "60-minute critical power aka CP60" and we derive power zones and other training insights from that. You can estimate your FTP in a shortened test or measure it in a lab test. Firstbeat derives estimates of FTP from your routine efforts, which is potentially less hard on your body than some of the FTP testing protocols that exist. Usefulness? 9/10. Yes, FTP and power are super-useful. Yes, it's great that FTP can be estimated by Firstbeat from sub-maximal efforts. No, FTP is not a panacea for world domination. https://the5krunner.com/2023/09/21/garmin-ftp/ Garmin Race Time Predictor - An Explainer There are various race and marathon predictors online which can extrapolate your performance from one distance to another. Just because you got a 5k PB with lots of anaerobic training does NOT mean that you will be able to anywhere near achieve a race predictor's time for a marathon. This screen is unchanged compared to several models from several years ago. However, my understanding is that Garmin has moved from its own calculations behind the scenes to using those from Firstbeat, which incorporate insights from trends in your Training Load, weekly mileage, and the presence of long runs in your training history. These elements combine to improve on the more traditional, less personalised predictions that rely solely on your current fitness level (VO2max) and general references regarding the sustainability of various intensity levels over time. [caption id="attachment_25485" align="aligncenter" width="1391"] Forerunner 645 Shown: If I could do a 2:50 marathon at London I would be 'quite pleased'.[/caption] I'll stick with the 645's image as the one the Fenix 6 shows isn't as flattering ;-) To be more honest, the newer predictions seem more accurate to me. Usefulness? 7/10. You can probably extrapolate your 5k time to your 10k time, and vice versa. For other comparisons, this is more of a guide to what your physiology could achieve with the correct stimuli for the distance. Calories Burned Hey. You know what calories are. And you can see them trended in lots of exciting ways. Usefulness? 5/10. I mean calories in-out are obviously important but...you're a triathlete worried about training too much rather than eating too much, right? Garmin Respiration Rates I've always wanted this metric and knew it was possible YEARS ago from HRV-derived data. Now that I have it, I'm not quite sure what to do with it. In some sports lab tests, Ventilatory Threshold (VT) is marked. Maybe there is a usefulness related to identifying VT? Usefulness? 5/10. I mean, breathing is obviously important but....do I target a higher breathing rate or monitor it over time? https://youtu.be/ZX8GCGYq8Zg Garmin All-day Stress and Recovery Stress can be something of a mystery, but it doesn’t have to be. The Fenix 6 features a special heart rate variability-based analysis capable of revealing the presence and intensity of the stress you experience. Checking in with this feedback will allow you to pinpoint activities, interactions, and events that produce stress in your life. [gallery size="medium" columns="2" ids="42534,42536"] You can also see when your body is in a state of rest and recovery. This can be particularly important when looking at your overnight stress data, which will shed some light into the restorative quality of your sleep. When examining this feedback, it’s essential to understand that stress isn’t necessarily a bad thing, and experiencing stress is an important part of life. The key is to ensure that stress is offset with adequate recovery, and maintaining this balance between stress and recovery is vital to being able to benefit from the challenges you experience in life and through your activities. Firstbeat Factette: The first Garmin device with All-day Stress & Recovery was the Vivosmart 3 (2016) Usefulness? 3/10 - I guess it's nice to know. Garmin Quick Stress Level Test I get stressed out just thinking about these things. On a scale of 0-100, how stressed are you right now? high=stressed. There's also a related link on the watch to a quick meditation period so you can worry about de-stressing instead. Usefulness? 3/10. Unless you are a stressed-out person, then it will stress you out some more ;-) Garmin Body Resources Body Battery combines All-day Stress data, physical activity, and the restorative power of sleep into a single & easily understood metaphor. Among other things, you can instantly see when a bad night’s sleep or an unusually stressful day at work will make a hard workout less beneficial than normal. I'm not quite sure how accurate this is as I spend much of my life sitting down and then periodically getting up and doing something crazy for a few hours. So I'm a little concerned that this shows me as stressed as soon as I get out of bed. I think I'm a fairly chilled-out person. The blue line in the chart represents your body battery or body resources. The higher it is the better prepared you are for mental and physical challenges. Overlay that with 'stress' and your activities then it's certainly an interesting chart to see the interplay of these factors throughout the day Usefulness? 4/10 [caption id="attachment_38326" align="alignright" width="2048"] Links to the best-priced local store from REI, PMC, Wiggle, Amazon[/caption] Return back to the main Garmin Fenix 6 Review This article is part of the site's sports science reference for endurance athletes.