The Reason Your Injury Isn't Healing
as Fast as It Used To
by Giacomo Kyle Hatanaka, LAc, MAcOM | Hidden Summit Acupuncture
One of the joys of getting older is that when you get hurt and you just kind of… stay hurt.
I say this from personal experience. My left shoulder loves to give me grief whenever I return to working out after any kind of break. I warm up before, I stretch after, I do all the things I’m supposed to do. And I still sometimes finish a session with that dull ache that I’m sure most of you have come to know and love yourselves. A few years ago that ache would sort itself out in two or three days on it’s own. These days it takes some intervention. Not much; it’s pretty straightforward actually. It just requires our very own Bex and her hair-thin needles. A few in the local area around the shoulder, a few more in spots that make absolutely no sense to anyone who hasn’t studied acupuncture (Ironically, those are where the money’s at. Don’t trust me? Don’t have to. It works, anyway).
The shoulder always comes around eventually. But the process has changed, and the timeline has changed, and I’ve had to make peace with that. What I’ve also done is actually understand why it happens. It might help you to understand it, too, because the biology here is genuinely interesting and goes well beyond the vague cultural script of “you’re just getting older, what do you expect.”
(Getting sick of hearing that line yet?)
Anyway, there are specific mechanisms at work. And knowing them changes how you approach recovery.
The Inflammatory Response Isn't
What It Used to Be
When you injure tissue (a strained muscle, a tweaked tendon, an overloaded joint) your body’s first response is acute inflammation. This is not the enemy. Acute inflammation is the opening act of the healing process: blood vessels dilate, immune cells flood the area, the debris of damaged tissue gets cleared, and the chemical signals go out that initiate repair.
In your twenties, this process tends to be crisp and well-regulated. Inflammation arrives, does its job, and resolves cleanly within a predictable window. The repair crew shows up, builds something, and leaves. It’s super annoying for the rest of us.
As you get into your thirties and forties, that process becomes less tidy. The acute inflammatory response is still there, but it resolves more slowly and less completely. There’s a growing body of research on what scientists have started calling inflammaging: the gradual shift, as we age, toward a state of low-grade chronic systemic inflammation that never fully quiets down between events. Lovely, right? An injury on top of a baseline that’s already slightly inflamed takes longer to resolve, because the regulatory signals that should be switching inflammation off are competing with a system that’s already running a little hot.
This is compounded by our good friend cortisol. Chronic stress keeps cortisol elevated, and cortisol at sustained levels actively suppresses the immune and repair processes involved in tissue healing. Not a little: meaningfully. The same stress response that’s disrupting your sleep and your hormones is also slowing down how quickly your rotator cuff recovers from Tuesday’s workout.
Growth Hormone and
the Repair Crew That's Getting Smaller
Here’s the mechanism that surprises people most when they hear it.
The majority of your daily growth hormone is released during deep sleep, specifically during the slow-wave stages in the first few hours after you fall asleep. Growth hormone is the primary signal that tells your body to repair damaged tissue, synthesize new protein, and rebuild what the day broke down. It’s not just for teenagers and athletes. It’s running your basic maintenance processes every single night.
Growth hormone output declines significantly with age. By some estimates, adults in their forties are producing roughly half what they produced in their twenties. This decline is gradual and goes largely unnoticed until you’re trying to recover from something and you realize the process that used to feel automatic now requires more deliberate support.
IGF-1 (insulin-like growth factor 1, which growth hormone stimulates) is the downstream signal that actually reaches the tissue and does the repair work at the cellular level. Lower growth hormone means lower IGF-1 means a quieter, less active repair signal reaching the injury site. The crew is smaller and working more slowly than it used to.
Poor sleep accelerates this significantly. Since the bulk of growth hormone release happens in deep sleep, anything that fragments or shortens that sleep directly cuts into your nightly tissue repair budget. The woman who’s sleeping five or six hours, or whose sleep quality has degraded in perimenopause, is not just tired; she’s chronically under-repairing at the cellular level.
Why Tendons and Ligaments Are
the Actual Worst
Not all tissue heals at the same rate, and understanding the hierarchy is useful if you’re trying to manage expectations around your own recovery.
Muscle tissue is relatively well-vascularized. It has a good blood supply, which means the inflammatory signals, immune cells, and repair materials move in and out efficiently. Muscle injuries, when managed reasonably well, tend to heal in weeks.
Tendons are significantly less vascularized. The blood supply to tendon tissue is sparse by design. Tendons are built for tensile strength, not metabolic activity, which means the delivery of repair materials to an injured tendon is slow and unreliable. Tendon injuries notoriously take months, not weeks, and they’re prone to incomplete healing that leaves the tissue structurally compromised and vulnerable to re-injury. Achilles tendinopathy, rotator cuff tendinopathy, tennis elbow, these are conditions that can linger for a year or more in people who are otherwise healthy and doing everything right.
Ligaments are worse still. Even less vascularized than tendons, with a cell population that turns over extremely slowly. A significant ligament injury (ie: a sprained ankle, an ACL, an SI joint) can take a year or more to genuinely heal, and in many cases never returns to its pre-injury structural integrity without intervention.
The age component compounds the vascular issue. As we get older, microcirculation (the fine network of capillaries that supplies these tissues) becomes less efficient. The blood supply to already poorly vascularized structures like tendons and ligaments gets even more limited. This is why an Achilles tendon injury that might have resolved in three months in your late twenties can become a six to nine month project in your mid-forties. The tissue hasn’t changed dramatically. The delivery system has.
Collagen Is
the Other Part of This
Collagen is the primary structural protein in tendons, ligaments, cartilage, and connective tissue generally. After roughly age 25, net collagen synthesis starts to decline. Your body still makes it, but the balance between production and breakdown shifts, and the quality of new collagen changes subtly. The crosslinks that give collagen its tensile strength become less organized over time, which means repaired tissue is mechanically slightly different from the original even when healing appears complete.
Estrogen plays a significant role in collagen synthesis, which is why perimenopause tends to accelerate some of these changes. Estrogen supports fibroblast activity; fibroblasts are the cells responsible for producing collagen. And as estrogen levels fluctuate and eventually decline, collagen production slows more sharply in women than the age-related decline alone would produce. This is one of the less-discussed reasons why joint pain, tendon issues, and slower recovery become more common in the perimenopausal years specifically, not just as a function of age generally.
What Acupuncture and Electroacupuncture
Actually Do Here
This is where I’ll tell you why Bex’s seemingly random needle placements are doing something real, because I think it’s worth understanding rather than just taking on faith (Or can you just take it on faith, I don’t really care).
Local needling at an injury site does several things that directly support the healing process. It increases local microcirculation, bringing more blood and therefore more repair materials to tissue that may have compromised vascular supply. It stimulates fibroblast activity and collagen synthesis at the needle site, which is one of the more well-documented mechanisms in acupuncture research. And it modulates the local inflammatory environment, helping shift the tissue from a state of chronic, stalled inflammation toward the kind of active, resolving inflammation that precedes genuine repair.
The distal points (the ones that make no sense until you understand channel theory) work through the connected pathways that run through the body. Needling a point in the hand or forearm to affect the shoulder isn’t guesswork. It’s working along a pathway where the shoulder and those distal points share a functional relationship, influencing circulation and neurological signaling across the whole channel rather than just at the site of pain.
Electroacupuncture adds a layer of direct tissue stimulation that is particularly relevant for tendons, ligaments, and nerves: exactly the structures that heal most slowly and that benefit most from improved local circulation and cellular activity. In sports medicine acupuncture, electrical stimulation at specific frequencies is used to enhance collagen synthesis, reduce scar tissue formation, and support nerve regeneration in ways that needle stimulation alone doesn’t fully achieve. This is why electroacupuncture has become a standard tool in not just our Boise clinic but in sports medicine acupuncture specifically: it addresses the vascular and cellular limitations of slow-healing tissue directly, rather than waiting for those limitations to resolve on their own timeline.
For my shoulder, the combination of local needling, a couple of distal points, and sometimes electrical stimulation gets me back to functional in a fraction of the time it would take otherwise. I’ve tested the alternative. It’s not better.
If you're still reading, You're probably onboard
So Let's go
If you’re dealing with something that isn’t healing the way it should (or healing the way it used to) we’d be happy to take a look at it. Hidden Summit Acupuncture is in Boise, working with patients across the Treasure Valley including Meridian, Nampa, and Eagle. Book online right now.
Giacomo Hatanaka is a licensed acupuncturist and co-owner of Hidden Summit Acupuncture in Boise, Idaho, where he focuses on pain, nervous system regulation, stress physiology, and helping overwhelmed high-functioning people feel like themselves again. He’s especially interested in why so many intelligent, capable people can function at a high level while feeling terrible almost all the time.