The day after an intense session or unusual physical activity, the muscles become stiff and sensitive to the slightest movement. These diffuse muscle pains have a name familiar to all athletes: aches. Far from being a simple temporary discomfort, they tell the story of what happens inside the fibers after exercise.
Understanding their mechanism helps you recover better, relieve them more quickly and limit them during future sessions. Here is what exercise physiology teaches us, and the concrete actions that really change everyday life.
What exactly is a soreness?
Soreness is muscle pain that appears with a delay, most often after a load to which the body is not accustomed. Scientists talk about DOMS, for delayed onset muscle soreness, that is to say delayed onset muscle pain.
The sensation is diffuse: the muscle pulls, becomes rigid, sometimes slightly swollen, and each gesture recalls the session of the day before. Unlike a sudden injury, the discomfort sets in gradually and affects the entire area worked on, such as the thighs, calves or back.
Aches, cramps or contractures: what are the differences?
These three sensations concern the muscle, but they have neither the same origin nor the same temporality. Confusing them often leads to bad reflexes.
- Soreness is a delayed and diffuse pain, linked to tiny damage to the fibers after exercise.
- A cramp is a sudden, involuntary and brief contraction, frequently caused by dehydration or fatigue.
- Contracture corresponds to persistent tension in a muscle that is no longer able to relax.
Why do we have aches after sport?
The explanation is largely due to microlesions of muscle fibers. When a muscle is subjected to a greater load than usual, its tissues tear on a microscopic scale. These microtraumas trigger a natural inflammatory reaction, causing the pain felt.
So-called eccentric movements clearly accentuate the phenomenon. Descending a staircase, braking a load or running on an incline causes more aches and pains than a classic pushing effort. The novelty of the exercise weighs as much as its intensity in the appearance of discomfort.
The myth of lactic acid
We often hear that lactic acid is responsible for body aches. This idea remains tenacious, yet it does not correspond to current knowledge. The lactate produced during exercise is eliminated within a few hours, well before pain sets in.
It is therefore the microlesions and inflammation that explain the discomfort, and not an accumulation of waste in the muscle. This nuance changes the way we approach recovery and directs us towards truly useful actions.
Is it a good sign to have aches?
Feeling soreness after a new activity reflects an adaptation of the muscle, not a performance in itself. Their absence does not mean that the session was ineffective, especially for a person already trained. Conversely, systematic and very painful aches often reflect too rapid progression.
How long do the aches last?
Pain rarely occurs right away. It appears between twelve and forty-eight hours after the session, reaches its maximum around the second day, then gradually subsides. In most cases, everything is back to normal within five to seven days.
This duration varies depending on the intensity of the effort, the level of training and the area used. Aches in the thighs after a first run can remain noticeable for several days, whereas a regular athlete recovers much more quickly.
The legs often concentrate these sensations, because they take the weight of the body with each support. The calves quickly remember us fondly after a long walk in the mountains or a return to running. The discomfort then follows the same schedule: a peak around the second day, then a gradual return to normal.
How to relieve muscle aches?
No method erases pain in an instant, but several actions speed up the return to comfort. The general idea is to promote blood circulation and let the muscle repair itself without rushing it.
A few errors, on the contrary, slow down recovery. Forcing on a painful area, increasing the number of anti-inflammatories or resuming a heavy session too soon maintains the discomfort more than calming it. Caution remains the most profitable reflex in the first days.
Do heat and cold help?
Heat relaxes muscles and improves blood flow to the sore area. A hot bath or lukewarm shower provides appreciable relief the day after a session. On the other hand, cold limits inflammation just after very intense exercise.
These two approaches complement each other depending on the timing chosen. The cold finds its place in the hours following exercise, the heat the following days to release residual tension.
Massage and self-massage
Massaging a sore area stimulates circulation and helps relieve tension. A few minutes of gentle pressure, with or without oil, is enough to relieve a sensitive leg. A self-massage roller makes this gesture accessible at home, without complicated equipment.
Hydration, sleep and diet
Drinking enough supports proper muscle function and recovery. Sleep also plays a central role, because it is during the night that tissues regenerate most effectively.
On the plate side, a correct protein intake contributes to the reconstruction of fibers, while magnesium contributes to normal muscle function. A varied diet generally covers these needs without any special supplements.
Should you stretch to get rid of aches and pains?
Stretching retains its value for flexibility, but its effect on already established aches and pains remains limited. Pulled too hard on a damaged muscle, they risk even increasing the discomfort. Slow, gradual movements are better than vigorous stretching.
Can you do sports with aches?
Moving gently often does more good than complete rest. Light activity, such as walking, leisurely cycling or swimming, boosts circulation and reduces stiffness. We then speak of active recovery.
Continuing an intense session on a very painful muscle does not bring anything useful, however. It is better to let the peak of pain pass, then resume in stages, otherwise there is a risk of slowing down the repair of the fibers.
How to prevent muscle aches?
We never completely eliminate muscle aches, particularly at the start of a program or after a long break. However, certain habits reduce its intensity and frequency.
- Increase the load and the duration of the sessions gradually, without skipping steps.
- Warm up before exercise to prepare the muscles and joints for the stress.
- Hydrate yourself regularly and take care of your recovery after each workout.
A serious warm-up does not make the pain go away, it nevertheless prepares the body for the intensity that follows. Regularity remains the best defense: a muscle accustomed to an activity ends up adapting to it and reacts less and less strongly.
Aches without sport or without fever: when to consult?
Aches sometimes occur without identifiable effort. A viral infection, flu or a simple cold are frequently accompanied by diffuse muscle pain, sometimes even before the fever. The body then mobilizes its defenses, which is felt throughout the body.
Several signs invite you to seek the advice of a doctor or health professional: very localized and sharp pain, marked swelling, discomfort that lasts for more than a week or which is added to other unusual symptoms. In these situations, the examination can rule out an injury such as a tear or strain.
For temporary discomfort linked to exercise, patience and simple actions are sufficient in the vast majority of cases. Staying tuned to your sensations and adjusting your practice prevents pain from becoming a lasting obstacle to the pleasure of moving.
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