Post-Test Recovery and Debrief: The Hours After the Piece

The context

A hard test on the erg is a piece of work with a clock on it, and the clock is the part everybody watches. The result comes up on the monitor, and from that moment the session looks finished. It is not.

The physiology of a hard piece keeps running for days. In a study of trained rowers doing high-intensity work, recovery was measured out to seventy-two hours after the session, and the recovery time course was longest after threshold sessions — the ones at eighty per cent of maximum heart rate and above ([7] Holt 2019). A 2k or a 5k is threshold work, and that is exactly the kind of session the study found slowest to recover. So the shape of what you are in is not an evening; it is a short arc that runs past tomorrow.

Two things follow, and they are the reason this article exists.

The first is that a result is a data point rather than a verdict. The difference between finishing first and second in a sporting event is under one per cent ([10] Currell 2008). That is not a motivational line. It is why the same test on a different day will not hand you the same number twice.

The second is that "recovery" has hardened into a protocol. There is a first thirty minutes, a list of things to do inside it, and an implied promise that doing them puts you back on the baseline. Most of that promise is not supported. What the evidence supports is narrower and easier to keep: replace what you spent, protect the night, let the soreness arrive rather than suppress it, and write the session down while you still remember it.

The core idea

Recovery is not a set of actions. It is the state you are in when you next train, and the three levers the evidence reaches are the fluid you lost, the carbohydrate you burned, and the sleep you get. Everything else the recovery aisle sells has thinner evidence behind it than the advice around it suggests.

The fluid. The position stand is plain about the goal: after exercise, replace any fluid and electrolyte deficit, and how quickly you need to replace it depends on the size of the deficit and how soon you need to be ready again ([1] American College 2007). It is equally plain that this is individual, because sweating rates vary considerably between people, so replacement programmes should be customised ([1] American College 2007). The stand says where your number comes from: individual sweat rates can be estimated by measuring body weight before and after exercise ([1] American College 2007). The protocol is not a litre figure lifted from an article. It is your own weight, before and after, and your own drinking matched to what comes back.

And when there is no urgency, there is nothing to do. Normal eating and drinking practices replace the deficit when recovery is not time-critical; aggressive drinking of fluids and electrolytes is for the case where the deficit has reached five per cent of body mass and recovery is urgent ([2] Shirreffs 2011). For a club rower with a test on Saturday and nothing on Sunday, that is the whole story: eat and drink as you normally would, and do not invent a recovery drink to fill the gap.

The carbohydrate. This is where the popular version does the most damage: it is usually right about the direction and wrong about the shape. The glycogen-resynthesis review puts the early phase at zero to four hours after exercise, where about one gram of carbohydrate per kilogram of body mass optimises resynthesis ([3] Burke 2017). That is the number worth having.

The part most people never hear is the next sentence. In the later phase of recovery, from four to twenty-four hours, carbohydrate intake should meet the fuel needs of the training you are about to do, and the type, form and pattern of intake matter less than the total ([3] Burke 2017). That is a different instruction from "eat within thirty minutes of the session": the window is real, it is just several hours wide, and it is not measured in minutes.

The clearest evidence for the direction of travel comes from a small trial in cyclists. Twelve cyclists did seventy minutes of cycling and then took carbohydrate either immediately or two hours later. Muscle glycogen was stored at 7.7 µmol per gram of wet weight per hour over the first two hours in the group that started immediately, and at 2.5 in the group that waited ([4] Ivy 1988). The authors' conclusion is that delaying the carbohydrate reduces the rate of muscle glycogen storage ([4] Ivy 1988). So the instruction is not "you have thirty minutes". It is "do not wait two hours either" — and once the first meal is behind you, the total is what counts, not the clock.

Protein. One line, because that is all the evidence supports. When carbohydrate intake is suboptimal, coingesting protein with carbohydrate can assist glycogen storage ([3] Burke 2017). That condition is attached to the claim, and it is not a prescription for a shake after every session.

The how-to

Do an easy row before you do anything else. Exercise is the most effective means of easing delayed-onset muscle soreness, but the analgesic effect is temporary ([5] Cheung 2003). So the cool-down earns its place by taking the edge off, not by doing anything that survives the drive home.

Know what kind of soreness you are in. Cryotherapy, stretching, ultrasound and electrical current have shown no effect on the alleviation of muscle soreness ([5] Cheung 2003), and a second review reaches the same place from the other side: stretching and massage may reduce soreness, but there is little evidence of any performance benefit ([6] Howatson 2008). A massage is fine if you enjoy it; a cold bath does not buy a faster return to training.

Do not use painkillers to train through the soreness. High-dose NSAIDs may reduce muscle damage and soreness, but they also attenuate the adaptive processes and should not be prescribed for long-term treatment ([6] Howatson 2008). You would be managing the signal instead of the cause.

Ease off for a day or two if the soreness is real. Athletes who have to train daily should reduce the intensity and duration of exercise for one to two days after intense soreness-inducing work ([5] Cheung 2003). A 2k is threshold work, and threshold work is what recovers slowest ([7] Holt 2019), so this is not advice to skip training but to row the easy session instead of the hard one.

Weigh in, then drink. Before and after an ordinary session, in the conditions you normally train in. That difference estimates your sweat rate ([1] American College 2007), and it is the number your drinking should be built on. Put the deficit back over the next few hours at the pace its size warrants ([1] American College 2007). If the deficit is five per cent of your body mass or more, and recovery is urgent, be aggressive about it ([2] Shirreffs 2011). Otherwise, normal eating and drinking does the job ([2] Shirreffs 2011).

Eat in the first few hours, then stop counting. Roughly one gram of carbohydrate per kilogram of body weight inside the zero-to-four-hour window, and from then on make sure the day's total covers what you are about to do ([3] Burke 2017). Start before you leave the building rather than two hours later ([4] Ivy 1988).

Protect the night. Sleep deprivation has significant effects on athletic performance, especially submaximal, prolonged exercise ([8] Halson 2014) — and a 2k, a 5k or a thirty-minute piece is exactly that. The same review notes that partial sleep loss reaches into glucose metabolism, appetite, food intake and protein synthesis ([8] Halson 2014): a short night is quietly editing tomorrow's fuelling as well. How much that costs you is less certain than the mechanism suggests, and the trade-offs below say so.

Write the debrief while it is fresh. This is the step most people drop, and the one that turns a test into more than a single number. Psychological skills training for high-intensity sport treats recovery skills as among the most important to develop, and its recommended tools include the facilitative interpretation of cognitive and somatic sensations — reading what you felt as information, not as a verdict ([12] Birrer 2010). Four lines will do.

• Pacing. The splits against the plan, and where they drifted.
• Sensations. Breathing, drive, the rate you settled on, anything that hurt.
• Conditions. The machine and the monitor, the room, what you ate and drank, how you slept, what you did in the two days before.
• One question. The single thing you will change next time.

That last line does the work: a test that produces one specific, answerable question is worth more than a test that produces a story about the last test.

The trade-offs

The first trade-off is that the first thirty minutes are not where the recovery is. The window the popular advice emphasises is narrow and mechanical; the arc that decides your next session is several days long. If you have attention for one part of this, spend it on tonight's sleep and tomorrow's food.

The second is that the sleep evidence is weaker than the sleep advice. The review is candid that the effect of sleep loss on physiological responses to exercise remains equivocal, that some maximal physical efforts and gross motor performances can be maintained, and that the few studies in athletes report a reduction in sport-specific performance ([9] Fullagar 2015). Studies of cognition report slower and less accurate performance, and reduced sleep quality and quantity can produce an autonomic imbalance that mimics overtraining ([9] Fullagar 2015). That last one matters on the morning after a test, because "am I overtrained or is the test still in my legs?" is a question you will ask yourself, and a bad night can produce the answer you fear for the wrong reason.

The third is that most soreness treatment does not earn its place. Exercise is the one thing that does something, and what it does is temporary ([5] Cheung 2003). Everything else in the recovery aisle is unproven, or has a benefit that does not show up in your next session ([6] Howatson 2008).

The fourth is that a single marker will not tell you when you are ready to train. Heart-rate variability looks like the obvious answer, and the rowers who have looked at it most carefully are the ones who distrust it. In four world-champion rowers, the same daily index fell in three of them while their parasympathetic activity was actually rising — a pattern the authors read as parasympathetic saturation — which is why they conclude that a combination of indices is needed ([11] Plews 2017). Four athletes is a small study, and it is enough to say only that a number on its own is not the answer. If you use it, use it as one voice among several, judged against your own baseline rather than a published threshold.

What to do tomorrow

Pick three.

For tonight: eat something with carbohydrate in it before you leave the building, drink to make the deficit back rather than to a published number, and protect the sleep. The first two come with numbers ([3] Burke 2017). The third comes with an honest caveat ([9] Fullagar 2015).

For tomorrow morning: weigh yourself, note how you feel, and decide the session from how you feel rather than from how the number looked. If the legs are sore in the dull, symmetrical way that follows a hard piece, take the easy session: soreness that follows intense soreness-inducing work is meant to be respected for a day or two, not trained through ([5] Cheung 2003).

For the week: write the four debrief lines while the session is still in your hands, and take the one question to the next session. Then let the result be what it is — a single data point, worth more next time for being written down than for being the number on the screen.