Reserve Heart Rate and Reserve Oxygen Uptake: Anchors to Stop Miscalculating Your Training Intensity

Starting With a Case Where “The Numbers Didn’t Add Up”

A few years ago, I coached an engineer who worked in the Hsinchu Science Park. Let’s call him A-Jhe. He was diligent—he bought a heart rate monitor, downloaded a training app, and followed the online advice to “ride at 70% of max heart rate for aerobic work.” The problem was, every time he rode at that number, he felt, “This is way too easy, like I’m just cruising.” But a colleague of similar age with average fitness rode at the same 70% figure and was gasping so hard he couldn’t talk.

Same “70% of max heart rate,” yet the two had completely different perceived exertion. A-Jhe even suspected his heart rate monitor was broken. But the monitor wasn’t broken—what was broken was the assumption baked into that formula.

This is exactly the topic I want to discuss today: when we talk about “training intensity,” which heart rate should we use as the baseline? A percentage of max heart rate (%HRmax), or a percentage of Heart Rate Reserve (HRR)? These two sound similar, but for some people, they differ by an entire training zone—enough to turn your interval session into a slow ride, or your recovery ride into a hard grind.

A-Jhe’s problem became immediately clear when we recalculated using the heart rate reserve method (the Karvonen method). Because he’d been riding for years, his resting heart rate was only 48 bpm, far below the typical 65 to 70 bpm. The %HRmax method completely ignores resting heart rate, so it systematically underestimated the heart rate he actually needed. In this article, we’ll get to the bottom of this once and for all.

Conceptual Foundation: What These Two “Percentages” Are Actually Calculating

Max Heart Rate Percentage (%HRmax)

This is the most intuitive method and the one most apps use by default. The approach is simple:

Target heart rate = Max heart rate × Target intensity percentage

For example, if someone has a max heart rate of 190 bpm and wants to work at 70%, that’s 190 × 0.70 = 133 bpm.

The problem with this method is that it treats “0 bpm” as the starting point of intensity. But you don’t exercise at 0 bpm—even when you’re lying asleep, your heart is still beating. True “rest” isn’t 0; it’s your resting heart rate. Using 0 as the baseline inflates the denominator of the entire “rest-to-max” range, so the same percentage corresponds to a systematically lower actual exercise intensity.

Heart Rate Reserve Percentage (%HRR)

This is where Karvonen’s insight comes in. He defined the “usable heart rate range” as the span from resting heart rate to max heart rate, calling it the heart rate reserve:

Heart Rate Reserve (HRR) = Max heart rate − Resting heart rate

The target heart rate formula then becomes:

Target heart rate = (Max heart rate − Resting heart rate) × Target intensity percentage + Resting heart rate

This formula was proposed by Finnish physiologist Martti Karvonen in the 1950s. Its core idea is that the “starting point” of intensity shouldn’t be 0, but your true resting state—your resting heart rate. It incorporates your personal resting baseline into the calculation, so it gives more accurate targets for people with particularly low resting heart rates (well-trained) or particularly high ones.

Running the Numbers with A-Jhe’s Data

A-Jhe’s numbers: max heart rate around 185 bpm, resting heart rate 48 bpm, target 70% aerobic work.

Method	Calculation	Target Heart Rate
%HRmax (70%)	185 × 0.70	~130 bpm
%HRR (70%, Karvonen)	(185 − 48) × 0.70 + 48	~144 bpm

That’s a 14 bpm difference. For heart rate training, 14 bpm is often the gap of an entire zone. No wonder A-Jhe felt like he was cruising at 130 bpm—because for him, that wasn’t even in the aerobic endurance zone yet. And his colleague with a resting heart rate of 70 bpm didn’t get as much underestimation from the %HRmax calculation, so his perceived exertion was naturally closer to expectations.

This is why “the same %HRmax can feel completely different for two people”: %HRmax is blind to differences in resting heart rate, and resting heart rates between individuals can differ by 20 to 30 bpm.

Why the Heart Rate Reserve Method Is More “Accurate”: It Aligns with Oxygen Consumption

At this point, you might ask: what makes Karvonen more “accurate”? What’s the standard for “accuracy”?

The answer is: it more closely tracks your body’s actual oxygen cost.

The gold standard for training intensity is actually oxygen consumption (VO2)—that is, how much oxygen your muscles are actually using to do work. Sports physiology universally recognizes that the most fundamental measure of exercise intensity is “what percentage of your maximal oxygen uptake capacity you’re using.” Heart rate is useful because it’s highly correlated with VO2 and is cheap and easy to measure.

VO2 Reserve (VO2R) and Its Twin Concept

Running parallel to heart rate reserve is VO2 Reserve (VO2R):

VO2 Reserve = Maximal oxygen uptake − Resting oxygen uptake

The logic here is identical to heart rate reserve: you don’t start from “zero oxygen consumption,” but from the basal metabolic oxygen use when you’re lying quietly at rest (about 3.5 ml/kg/min, which is 1 metabolic equivalent, or MET).

Here’s the key fact: research shows that the percentage of heart rate reserve (%HRR) and the percentage of VO2 reserve (%VO2R) have a near 1:1 linear relationship. In other words, when you’re riding at “70% heart rate reserve,” you’re working at roughly “70% VO2 reserve.” This finding was significant enough that the American College of Sports Medicine (ACSM) adjusted its exercise intensity guidelines in 1998, treating %VO2R and %HRR as interchangeable equivalent metrics.

In contrast, %HRmax aligns with %VO2max, but that relationship isn’t 1:1, and the deviation is especially noticeable at low to moderate intensities. So if you want to “use heart rate to represent true physiological intensity,” %HRR is the more honest translation.

Comparing the Three Percentages Side by Side

To give you a clearer picture, let’s line up three common ways of expressing intensity. Assume a rider with a moderate-to-low resting heart rate (max 185, resting 50, HRR = 135), and see how the same “70% intensity” differs across these three “languages”:

Expression	Baseline Definition	Aligned VO2 Metric	Heart Rate at 70%	Common Misuse Risk
%HRmax	From 0 to max heart rate	%VO2max (not 1:1)	~130 bpm	Severely underestimates for those with low resting heart rate
%HRR (Karvonen)	From resting to max heart rate	%VO2R (near 1:1)	~145 bpm	Inaccurate if resting heart rate is measured poorly
%VO2R	From resting to max VO2	Itself is the VO2 metric	Requires gas analysis to measure	Difficult for most people to measure directly

The takeaway from this table: if you only have a heart rate monitor and want the numbers to stay as close as possible to true physiological oxygen cost, %HRR is the most practical choice—it requires no special equipment, just three numbers, yet delivers accuracy close to %VO2R.

An Honest Caveat

I must point out: this 1:1 relationship isn’t set in stone. Research also shows that as intensity approaches maximum, %HRR and %VO2R gradually drift from the ideal 1:1; and individual variability is considerable. Studies in cardiac patient populations found a slope very close to 1 (around 0.96 to 0.97), but that’s a group average—there will still be deviations when applied to any individual.

So treat Karvonen as a better estimation tool, not an absolutely precise ruler. True precision still requires laboratory VO2 analysis or personalized lactate/ventilatory threshold testing. I’ll come back to this later.

So Why Do So Many Apps Still Default to %HRmax?

You might wonder: if %HRR is so good, why do many watches and apps still default to %HRmax? The reason is practical—%HRmax only needs one number (max heart rate) and doesn’t require asking for your resting heart rate, which is more convenient for product design that doesn’t want to burden the user. It’s not “wrong,” it’s “coarse”: for users whose resting heart rate is close to the population average, the two methods differ little; but for people at either extreme (well-trained or naturally high resting heart rate), it becomes inaccurate.

So my advice is simple: if your app allows you to switch the intensity calculation method, change it to Karvonen/HRR, and honestly enter a properly measured resting heart rate. That ten-second setting could be the dividing line between “training at the right intensity” and “consistently training off-target” for the next several months. As a side note, after switching, you’ll notice the upper and lower heart rate limits of each zone generally shift upward. At first it might feel like “this got harder,” but it’s not harder—you were simply training too easy before.

Practical Method: Turning the Formula into a Usable Zone Chart

Step 1: Get Three Numbers

The Karvonen method needs three inputs: resting heart rate, max heart rate, and target intensity.

Resting heart rate: This is the soul of the Karvonen method, so measure it carefully. Recommended approach:

• Measure for 1 minute while lying still, right after waking, before getting out of bed and before checking your phone.
• Take the average of 3 to 5 consecutive days to avoid single-day error.
• Avoid alcohol, late nights, and excessive caffeine the night before—these all elevate resting heart rate.

Max heart rate: The most accurate way is a field test (a ramp test under professional supervision), but most people can use an estimation formula as a starting point. Common age-based estimates carry significant individual error (people of the same age can have true max heart rates differing by ±10 to 12 bpm), so:

• If you have a heart rate monitor and regularly do high-intensity intervals, check your historical data—the highest heart rate you’ve seen at the tail end of an all-out effort is often closer to your true max than any formula.
• Treat a formula-estimated max heart rate as a “provisional value” and refine it over time using perceived exertion and field tests.

Target intensity: Choose based on your training goal—see the zone chart below.

Step 2: Karvonen Heart Rate Zone Chart (Example)

The following uses a hypothetical rider with a max heart rate of 185 bpm and resting heart rate of 55 bpm, so HRR = 130 bpm. Substitute your own numbers in practice. The intensity zones follow the common five-zone concept in exercise physiology, with ranges rather than false precision.

Zone	Training Purpose	%HRR	Target Heart Rate (bpm)	Perceived Exertion (RPE 1-10)
Z1 Recovery	Active recovery, warm-up	50–60%	120–133	2–3, can chat easily
Z2 Aerobic Endurance	Base building, long rides	60–70%	133–146	3–4, can speak full sentences
Z3 Tempo	Upper aerobic, tempo	70–80%	146–159	5–6, speech starts to break up
Z4 Threshold	Lactate threshold, TT ability	80–90%	159–172	7–8, can only utter single words
Z5 Maximal	VO2max intervals	90–100%	172–185	9–10, unable to converse

A few things to note:

• You’ll notice that the Z1 starting point calculated with %HRR (120 bpm) is already clearly above resting heart rate. This is exactly Karvonen’s advantage—it doesn’t mistake “barely moving” for a training zone.
• Including RPE (rating of perceived exertion) alongside is intentional. Heart rate drifts with caffeine, sleep, dehydration, and temperature; perceived exertion is the best real-time correction tool, so look at both together.

Step 3: Mapping Zones to Actual Workouts

Having zones isn’t useful unless you map them to training content. Here are the cycling workout skeletons I commonly give to students with different goals (durations and repetitions are examples only—adjust to your own situation):

Workout Type	Primary Zone	Example Content	Recommended Frequency per Week
Long slow distance (LSD)	Z2	90–180 minutes of steady riding	1–2 times
Tempo	Z3	2×20 minutes, 5 minutes rest between	1 time
Threshold intervals	Z4	4×8 minutes, 4 minutes rest	1 time
VO2max intervals	Z5	5×3 minutes all-out, 3 minutes rest	1 time (advanced)
Recovery ride	Z1	30–45 minutes very easy	Insert as needed based on fatigue

This is where the most classic principle of cycling training lies: the majority of volume belongs in Z2. A common flaw is “too much moderate intensity, not enough easy, not enough hard,” leaving the whole week stuck in the gray zone of Z3—exhausting yourself without building an aerobic base. With a correctly calculated Karvonen Z2 ceiling, you’ll know whether you’ve been pushing too hard again.

Application Scenarios Specific to Taiwan

Now that you have zones, how do you map them to common riding venues in Taiwan? Here are some practical pairings:

• Riverside bike paths (e.g., Dadaocheng, Xindian River, Dongfeng Green Corridor): Flat, few traffic lights, ideal for steady Z2 long rides and Z3 tempo sessions because you can maintain constant intensity without heart rate being disrupted by stop-and-go traffic.
• Yangmingshan, Fengguizui, Xizhi Wuzhi Mountain: Climbing sections are natural venues for Z4 threshold and Z5 interval work. On climbs, resistance is steady, making it easier to push heart rate into the target zone and hold it there—more controllable than sprinting on flat ground.
• High-altitude routes like Wuling and Hehuan Mountain: The higher the altitude, the higher your heart rate will be at the same intensity, and oxygen uptake is limited. In this case, fixed heart rate targets become unreliable, so switch to perceived exertion and power as the primary guides, with heart rate as a reference. Also, be sure to assess your physical condition before any high-altitude challenge.
• Indoor trainers (during rainy season or poor air quality): Taiwan has heavy plum rain season, frequent summer afternoon thunderstorms, and poor air quality on some winter days, making the trainer a great alternative. Indoor heat dissipation is poor, so heart rate runs higher than outdoors at the same power—remember to use a strong fan and be mentally prepared for heart rate drift.

On fueling, Taiwanese riders should pay special attention to fluids and electrolytes. In the humid summer heat with heavy sweating, on rides over 90 minutes, aim for roughly 500 to 1000 ml of fluid per hour, plus sodium depending on sweat rate; for energy, 30 to 60 grams of carbohydrates per hour is a common range, varying by individual and intensity. The high density of convenience stores is a perk for Taiwanese riders—make good use of resupply points and don’t let dehydration drag down your heart rate data and performance.

Deep Dive Case Studies: Three Riders with Different Resting Heart Rates

Principles alone can feel abstract, so I’ve condensed three typical students I’ve coached into three fictional but realistic cases to show how differences in resting heart rate completely change your zones. All three are the same age, all assumed to have a max heart rate of 185 bpm, differing only in resting heart rate.

Case	Background	Resting Heart Rate	HRR	70% HRR Target	If Using %HRmax 70%
Xiao-Mei	Sedentary office worker, new to cycling	74 bpm	111	~152 bpm	~130 bpm
A-Ming	Weekend rider for 3 years, average fitness	60 bpm	125	~148 bpm	~130 bpm
A-Jhe	Long-term consistent training	48 bpm	137	~144 bpm	~130 bpm

See the pattern? If all three use 70% of %HRmax, the target heart rate is uniformly 130 bpm—seemingly fair, but it severely underestimates for someone like A-Jhe who is well-trained (his true 70% aerobic effort should be 144). Karvonen, on the other hand, gives targets that separate according to resting heart rate: Xiao-Mei 152, A-Ming 148, A-Jhe 144.

Interestingly, the intuition that “the lower the resting heart rate (the more trained), the smaller the gap between Karvonen and %HRmax targets” is wrong—in fact, the largest gap is exactly A-Jhe’s. The reason: the lower your resting heart rate, the longer the baseline that %HRmax “ignores,” and the more severe the underestimation. This also explains why the more seriously you train, the less you should use %HRmax—otherwise, you’ll keep boxing yourself into intensities that are too easy, training hard yet never feeling like you’re getting enough stimulus.

Conversely, look at Xiao-Mei: her resting heart rate is high, so %HRmax underestimates her less severely, but Karvonen still gives her a more reasonable starting point. After six months of training, when her resting heart rate drops from 74 to 62, her entire zone chart needs to be recalculated—which is exactly why I keep emphasizing “update every 4 to 6 weeks.”

Common Mistakes and Corrections

Having coached for years, I’ve seen the same pitfalls countless times. Here are the most common ones:

Mistake 1: Filling in a Random Resting Heart Rate

More than half of Karvonen’s accuracy rests on the resting heart rate. Some people just enter “60” to get it over with, when their actual number is 48 or 72, skewing the entire zone chart. Fix: measure it properly, average multiple days, and re-measure every few weeks (as fitness improves, resting heart rate drops, and zones need to be updated accordingly).

Mistake 2: Treating an Estimated Max Heart Rate as Gospel

Age-based formulas have large individual error. Applying one rigidly could set your Z5 ceiling too low (not enough stimulus to train) or too high (you’ll never reach it, just creating frustration). Fix: treat the formula value as provisional and refine it repeatedly using actual peak heart rates from high-intensity sessions and perceived exertion. If you’re serious, the most efficient approach is to get a ramp test done once at a sports science center.

Mistake 3: Ignoring Daily Heart Rate Drift

Taiwan’s summers are humid and hot. At the same power output, heart rate on a hot day can be 5 to 15 bpm higher than on a cool day (cardiovascular drift plus heat dissipation burden). If you fixate on a rigid heart rate number, you’ll be forced to lower intensity on hot days and think you’re regressing. Fix: on hot days, prioritize perceived exertion/power with heart rate as a secondary reference; or simply shift your heart rate targets up by a few bpm as a heat compensation. In Taiwan’s summer, also avoid training during the hottest hours—early morning or evening is safer.

Mistake 4: Copying Someone Else’s Zone Chart

Copying a teammate’s zones is the most pointless thing you can do. Everyone’s max heart rate and resting heart rate differ, and the very value of Karvonen lies in personalization. Fix: spend ten minutes calculating your own—don’t take shortcuts.

Mistake 5: Thinking Karvonen Can Replace Threshold Testing

Karvonen is an excellent “starting move,” but ultimately it’s a linear interpolation based on just two points: max and resting. The lactate threshold and ventilatory threshold that truly determine your endurance performance vary by individual and don’t necessarily fall at a fixed %HRR. Fix: serious endurance athletes should pursue threshold-related testing (e.g., a 20-minute power test to estimate FTP, or laboratory ventilatory threshold analysis) to fine-tune their zones.

Mistake 6: Mixing Up Karvonen Percentages with %HRmax Percentages

This is the pitfall I’ve seen cause the most communication disasters. A coach says “do 70% today,” and the athlete goes home and matches it against their watch’s %HRmax setting, ending up at a significantly lower intensity while thinking they trained properly. Fix: when discussing intensity, always clarify whether it’s “70% HRR” or “70% HRmax”—they are not the same thing. For the same number, Karvonen percentages always correspond to a higher actual heart rate than %HRmax. In team training, standardize on one language to avoid talking past each other.

Mistake 7: Forgetting That Zones Shift as Fitness Changes

Many people calculate their zones once and use them for a whole year. The problem is that as you get fitter, your resting heart rate drops, and your heart rate at the same pace also drops (your heart pumps more blood per beat). Zones from six months ago may already be too low six months later. Fix: build “zone updates” into your training cycle—when seasons change, training phases shift, or you clearly feel a change in fitness, re-measure your resting heart rate and recalculate.

Actionable Advice for Readers at Different Levels

If You’re a Beginner Just Riding for Health

You don’t need to obsess over five zones. Just master two things:

1. Use Karvonen to calculate your 60–70% HRR (Z2)—this is the “comfortable aerobic” zone where you should spend most of your time.
2. Learn the “talk test”: if you can speak full sentences easily, the intensity is right; if you’re gasping and can only utter single words, you’re pushing too hard.

For general health, accumulating about 150 minutes of moderate-intensity aerobic exercise per week is highly valuable. Use heart rate as a reference and perceived exertion as the guide, and you’ll ride longer without injury.

If You’re an Intermediate Rider Looking to Improve

• Calculate all five zones and implement the “Z2 as the base, Z4/Z5 as supplements” distribution.
• Re-measure resting heart rate and update zones every 4 to 6 weeks.
• Start a training log, cross-referencing heart rate, power, and perceived exertion to find which zone your personal threshold heart rate falls into.

If You’re an Advanced or Competitive Athlete

• Treat Karvonen as a rough estimate before calibration; anchor your formal training on power or threshold heart rate.
• Regularly field-test max heart rate and threshold—don’t let your zones go stale.
• Understand that the %HRR≈%VO2R 1:1 relationship drifts at high intensity, so your Z5 intervals should rely more on power and perceived exertion than heart rate alone.

A Quick Self-Checklist

Check Item	Have You Done It?
Resting heart rate measured lying still in the morning, averaged over multiple days	☐
Max heart rate field-tested or at least corrected with high-intensity peak data	☐
Zones calculated with Karvonen (resting heart rate included)	☐
Majority of training volume in Z2	☐
Heat compensation applied to heart rate/perceived exertion on hot days	☐
Zones updated every 4–6 weeks	☐

If you’ve checked all six, your intensity anchors are solid. Save this table on your phone and review it monthly—you’ll find your training quality quietly stabilizes.

Frequently Asked Questions (FAQ)

Here are the questions I get asked most often when coaching, all in one place.

Q1: Without a lab, what’s the safest way to estimate max heart rate?

Age-based formulas (like the common “220 minus age” or newer versions) can serve as a starting point, but remember their individual error can exceed ±10 bpm. A more practical approach: dig through your heart rate monitor’s history for a high-intensity session where you truly pushed to the point of nearly throwing up and your heart rate couldn’t go any higher—that peak is often closer to your true max than any formula. If you want a relatively safe and standardized field test, you can do a “3 to 4 minute all-out climb” after a thorough warm-up, but only if your heart is healthy and ideally with someone accompanying you.

Q2: My resting heart rate changes every day—which number should I use?

Use the “average of 3 to 5 consecutive days of morning lying-still measurements.” Single-day values are affected by sleep, stress, caffeine, and the previous day’s training load. As a side note, if you notice your resting heart rate is 5 to 7 bpm or more above your average on a given morning, that’s usually your body telling you “not fully recovered yet”—a good day to lighten the workout. Resting heart rate itself is an excellent recovery monitoring metric.

Q3: Are wrist-based optical heart rate monitors accurate for Karvonen-calculated heart rates?

Wrist optical (PPG) sensors are usually adequate for steady aerobic efforts, but during high-intensity intervals, out-of-saddle efforts, or rough terrain, they’re prone to missed readings or errors (e.g., mistaking cadence for heart rate). If you’re serious about Z4 and Z5 heart rate sessions, a chest strap is far more stable.

Q4: I take blood pressure medication—can I still use Karvonen?

It depends on the medication type. Beta-blockers directly suppress max heart rate and the heart rate response to exercise, in which case both %HRmax and %HRR formulas become unreliable. Be sure to consult your physician first, and have a professional adjust your intensity prescription based on your medication—don’t blindly apply the formula yourself.

Q5: Can I share heart rate zones across running, swimming, and cycling?

I don’t recommend sharing them directly. For the same person, max heart rate while running is usually slightly higher than cycling (by a few bpm), and swimming differs even more due to the horizontal body position, water pressure, and heat dissipation. Ideally, measure max heart rate for each sport and calculate a separate zone chart for each. If that’s too much trouble, at least know the direction: “cycling zones applied to running will be too low.”

An Important Health Reminder

Heart rate training has a prerequisite: your heart itself must be healthy. If you have high blood pressure, arrhythmia, a history of heart disease, or a family history of sudden cardiac death, get a physician’s evaluation before exercising. Certain cardiovascular medications (such as beta-blockers) directly suppress your max heart rate and exercise heart rate response, making both age formulas and Karvonen unreliable—your intensity prescription must be individualized by a physician and qualified professionals, not applied from a textbook.

Taiwan’s healthcare system is very accessible—make good use of National Health Insurance resources. If you’re in the “three highs” group or are middle-aged and have been inactive for a long time, a pre-exercise cardiac function assessment (such as an exercise ECG) is a worthwhile investment. If you experience chest tightness, chest pain, unusual breathlessness, dizziness, or cold sweats during exercise, stop immediately and seek medical attention—don’t push through.

This article is educational content and cannot replace individual diagnosis and treatment advice from a physician, physical therapist, or nutritionist.

Conclusion: Let the Numbers Serve You, Not Hold You Hostage

Back to A-Jhe’s story. After recalculating his zones with Karvonen, he finally understood why he’d felt “no matter how I trained, it was always too easy”—he’d been using a formula that didn’t account for his low resting heart rate, boxing himself into intensities that were too low. After the correction, his Z2 long rides finally hit true aerobic stimulus, and three months later, he took nearly two minutes off his previous time on a climbing time trial.

The heart rate reserve method is worth learning not because it’s complicated, but because it restores a fact about you that was always there yet ignored by simplified formulas: your resting baseline. When the starting point of intensity moves from the fictional “0” back to your real “resting heart rate,” every target you calculate truly belongs to you.

But don’t forget—no matter how good the formula, it’s still an estimate. What ultimately calibrates you is always your body’s feedback: your breathing, the feel in your legs, your resting heart rate when you wake up the next day. Treat Karvonen as a clearer pair of glasses—put them on to see your training, but you still walk by the feel of your own feet. Spend ten minutes tonight filling your resting heart rate and max heart rate into the formula, calculate your own five zones, and start putting them into practice on your next ride. May every session you do land at the right intensity.

References

• Karvonen formula and exercise prescription principles: British Columbia Medical Journal — The science of exercise prescription: Martti Karvonen
• Relationship between %HRR and %VO2R, ACSM guideline changes: The relationship of heart rate reserve to VO2 reserve (Medicine & Science in Sports & Exercise)
• Comparison of %HRmax, %HRR, %VO2max, and %VO2R in cyclists: Relationship between %HRmax, %HR reserve, %VO2max, and %VO2 reserve in elite cyclists (PubMed)
• ACSM exercise intensity guidelines and VO2R discussion: ACSM Exercise Intensity Guidelines (Journal of Exercise Physiology online)

Related Reading

• Running Pace and Heart Rate Zones: Building Your Training Intensity Framework
• Heart Rate Zone Settings for Cycling Training: Various Methods for Estimating Max Heart Rate
• Heart Rate Running: Controlling Training Intensity with Heart Rate Instead of Pace
• Heart Rate Pacing Method: Practical Applications of Using Heart Rate Zones to Control Marathon Pace