Screen Apnea: What Shallow Breathing at Work Costs You

I didn't notice I had stopped breathing properly until my body forced the issue — dizzy on a bus home after another long day in front of the screen. What I learned afterwards is that the thing I had been doing all day — breathing fast and shallow, and sometimes not at all while reading a pull request or an inbox — has a name, a literature, and a cost.

This post is that literature. It covers what a screen-bound workday does to your breathing, what that breathing pattern does to focus, creativity, health and productivity, and what the evidence says fixes it. Every number links to its source, and there is a section at the end on what the research does not say. (The short, personal version is in Why I made Glimt.)

The numbers at a glance

What is screen apnea?

In 2007, Linda Stone — a former Apple and Microsoft executive — noticed that she held her breath every time she opened her inbox. So she ran what she calls "dining room table science": she invited around 200 friends, neighbours and family members to check their email while she watched their breathing and heart rate. Roughly 80% of them periodically held their breath or changed their breathing while doing it. She called it "email apnea", and later, "screen apnea" [10].

That 80% figure is an informal observation, not a study, and you should hold it that way. But when The New York Times revisited it in 2023, Stephen Porges — the University of North Carolina psychiatry professor behind polyvagal theory — put the mechanism plainly: it's a manifestation of the body's stress response, harmless in bursts, a problem when it's switched on all day, every day, because it shifts "the nervous system into a chronic state of threat" [10].

What is not informal is the lab evidence that concentrating at a computer changes how you breathe.

The lab evidence

• In 1994, two NIOSH researchers measured end-tidal CO₂ — the carbon dioxide in your exhaled breath, a direct readout of whether you are over-breathing — in people doing computer data entry. CO₂ fell significantly during work compared with relaxation, and it was the only physiological measure that reliably told work apart from rest. The authors called it "a hyperventilatory stress effect": not the metabolic cost of typing, but stress-driven over-breathing [11].
• The same group later proposed a "hyperventilation theory of job stress": mental stress at the desk leads to subtle over-breathing, which lowers blood CO₂, which raises muscle tension — including in the trapezius, the muscle you rub when your neck and shoulders hurt after a long day [12].
• A 2016 systematic review pooled every study on breathing under cognitive load and found a consistent pattern: mentally demanding tasks produce faster breathing, higher minute ventilation and lower end-tidal CO₂ — over-breathing — while breath depth stays roughly the same [13].
• The emotional side has a mapped circuit. Anxiety and anticipatory fear raise respiratory rate through the amygdala: electrically stimulating it speeds breathing up, and lesioning it blunts the anxious rise in breathing rate. Negative, arousing emotions push breathing toward shallow and rapid [14].

Put those together and you get a plausible picture of an ordinary knowledge-work day: a resting breathing rate that should sit around 12–20 breaths per minute [15] creeps upward, gets shallower, and pauses altogether at moments of focus or dread — the pull request, the Slack ping, the "quick question."

The modern workday makes it worse

Gloria Mark's group at UC Irvine has tracked how office workers use screens for two decades. Average attention on a single screen fell from about 2.5 minutes in 2004 to 47 seconds in more recent data, and it takes around 23 minutes to fully return to a task after an interruption [16]. In a controlled experiment, interrupted workers actually finished faster — but at the cost of "more stress, higher frustration, time pressure and effort" [17]. Every one of those switches is exactly the kind of small cognitive-emotional spike that the studies above show alters breathing.

Your chair is part of it

Posture is the other half of desk breathing. In a study of 70 healthy adults, slumped sitting significantly reduced forced vital capacity, FEV1 and peak expiratory flow compared with upright sitting [18]. A 2018 study found that slouching cut inspiratory muscle strength by 8.7 cmH₂O — the diaphragm and its helpers simply cannot work as well folded over a laptop [19]. Shallow breathing isn't only a stress habit; the position we work in mechanically enforces it.

What shallow breathing does to focus

Over-breathing sounds like it should deliver more oxygen to the brain. It does the opposite. Blowing off CO₂ constricts the brain's blood vessels, and the effect is measurable during ordinary mental work. In one study, the involuntary hyperventilation people did while solving arithmetic problems reduced blood-flow velocity in the middle cerebral artery — on top of the reduction caused by voluntary hyperventilation alone [20]. A 2019 experiment isolated the effect: hyperventilation-induced low CO₂, by itself, slowed reaction times from roughly 570–590 ms to about 720 ms [21]. That is a 20–25% slowdown on a simple task, produced by nothing but breathing pattern.

Breathing and attention are also physically coupled. A 2018 paper in Psychophysiology showed that the locus coeruleus — the brainstem nucleus that sets your level of alertness — is sensitive to CO₂ and fires in rhythm with breathing, so breathing pace and attentional state move together [22]. The authors' point was that this is why breath-focused practices sharpen attention. The corollary is that erratic breathing is erratic attention.

Then there is memory. Intracranial recordings in humans show that nasal breathing entrains rhythms in the amygdala and hippocampus, and that people recognise fearful faces faster and recall images better when tested on an inhale — an effect that disappears with mouth breathing [23]. A follow-up found that breathing through the nose during a one-hour rest window improved memory consolidation compared with mouth breathing [24]. Mouth-breathing through a stressful afternoon is, at minimum, not helping you remember what happened in it.

What it does to creativity

Here the evidence is about stress rather than breathing directly, and I will keep it that way. A meta-analysis of 76 experimental studies found that evaluative stress has a curvilinear relationship with creativity: mild pressure helps, but highly evaluative, high-pressure conditions reduce creative performance [25]. A companion meta-analysis found that anxiety — both as a trait and as a momentary state — is negatively related to performance on creative tasks [26]. If fast, shallow breathing is the physiological signature of that state, it is also the earliest and cheapest place to intervene.

What it does to your health

Chronic activation of the stress response is not abstract. The largest individual-participant meta-analysis on the subject — 197,473 people across 13 European cohorts, followed for an average of 7.5 years — found that job strain raised the risk of coronary heart disease by 23% (HR 1.23, 95% CI 1.10–1.37) [5]. The WHO and ILO estimate that working 55 or more hours a week raises stroke risk by 35% and the risk of dying from ischemic heart disease by 17%, and attribute 745,000 deaths in 2016 to long hours alone [6].

Breathing sits directly on that pathway. A 2019 systematic review found diaphragmatic breathing produced statistically significant reductions in both systolic and diastolic blood pressure, alongside lower anxiety [27]. And the NIOSH hyperventilation model links desk-stress over-breathing to the neck and shoulder pain that is the most common physical complaint of computer workers [12].

What stress costs in productivity

Nobody has put a price on shallow breathing specifically, and I won't pretend otherwise. What has been costed is the stress response it belongs to.

• Gallup's 2026 State of the Global Workplace (2025 data): 40% of employees worldwide experienced "a lot of stress" the previous day — 50% in the US and Canada, the highest of any region. Only 20% are engaged at work; 22% felt anger and 23% felt sadness a lot of the previous day [1].
• Gallup estimates that low engagement cost the world economy approximately US$10 trillion in lost productivity last year, or 9% of GDP [4].
• The APA's 2023 Work in America survey: 77% of US workers reported work-related stress in the past month; 57% reported negative impacts including emotional exhaustion (31%) and lower productivity (20%) [2]. In Gallup's data, 76% of employees experience burnout at least sometimes and 28% "very often" or "always" [28].
• The WHO puts the global bill for depression and anxiety at 12 billion lost working days a year, roughly US$1 trillion in lost productivity [3].
• Deloitte's 2024 UK analysis: poor mental health costs employers £51 billion a year, and the largest share — £24 billion — is presenteeism: people at their desks, working below capacity. The same report found an average return of £4.70 for every £1 spent on workforce mental health [29].

Breathing is not a mental-health programme. It is the fastest-acting lever on the autonomic state underneath these numbers, and it costs nothing.

What the evidence says actually fixes it

The meta-analyses

• Fincham et al. (2023), 12 randomised controlled trials, 785 adults: breathwork lowered subjective stress versus control conditions, g = −0.35 [95% CI −0.55, −0.14]. Secondary analyses found similar effects on anxiety (g = −0.32, 20 trials) and depressive symptoms (g = −0.40, 18 trials). The authors explicitly warn against "a miscalibration between hype and evidence" — these are small-to-medium effects from mostly moderate-quality trials [7].
• Goessl et al. (2017), 24 studies: heart rate variability biofeedback — which in practice means breathing at around six breaths per minute with feedback — reduced stress and anxiety with a large effect, g = 0.83 versus control [8].
• Laborde et al. (2022) meta-analysis: voluntary slow breathing reliably increases cardiac vagal activity (heart rate variability) during the practice, immediately after it, and across a training programme [30]. Zaccaro et al. (2018) reviewed the mechanism: breathing under 10 breaths per minute raises HRV and respiratory sinus arrhythmia, shifts brain activity toward relaxed patterns, and lowers anxiety and arousal [31].

The five-minute study

The trial most relevant to a workday is Balban et al. (2023) from Stanford. Participants were randomised to one month of five minutes a day of either mindfulness meditation or one of three breathing exercises: cyclic sighing (two inhales through the nose, then one long exhale through the mouth), box breathing (equal inhale, hold, exhale, hold), or cyclic hyperventilation with retention. The breathing groups improved more than the meditation group on daily mood, and cyclic sighing — the most exhale-heavy protocol — also lowered resting respiratory rate, with effects growing the more days people practised [9]. The dose was five minutes.

Attention and cortisol

Ma et al. (2017) trained 40 adults in diaphragmatic breathing at about four breaths per minute for 20 sessions over eight weeks. The breathing group improved on a sustained-attention task, reported less negative affect, and had lower salivary cortisol; the control group didn't change [32]. Perciavalle et al. (2017) found the same triad — lower cortisol, lower heart rate, better mood — after a deep-breathing protocol in 38 students [33].

Under acute pressure

• A 2026 randomised trial put 66 people through a virtual Trier Social Stress Test — the standard lab method for stressing people with a surprise speech and mental arithmetic — after a short session of box breathing, prolonged exhalation, or normal breathing. Both breathing protocols blunted the post-stress rise in heart rate, state anxiety and salivary alpha-amylase compared with normal breathing. Cortisol and cognitive scores did not differ, which the authors attribute partly to the task design [34].
• Röttger et al. (2021) compared box ("tactical") breathing with prolonged exhalation in a stressful task: box breathing produced the lower physiological arousal, prolonged exhalation the better task performance — a useful distinction if you need to perform in the next five minutes rather than calm down [35].
• A 2025 preregistered field study of 96 police students found that pairs instructed in tactical breathing performed better in a simulated critical incident, even though their self-reported stress didn't change [36]. Feeling calmer is not the only benefit; doing the job better under load is a separate, measurable one.

Breaks in general help — a little

For context, a 2022 meta-analysis of micro-breaks (22 samples, 2,335 people) found small but reliable gains in vigour (d = 0.36) and reductions in fatigue (d = 0.35), with performance benefits appearing only for less demanding tasks and growing with break length [37]. A break in which you breathe slowly for five minutes is a micro-break with a specific, evidenced physiological effect attached.

The dose that works

Bentley et al. (2023) reviewed 58 clinical trials of breathing practices for stress and anxiety and asked a practical question: what did the effective ones have in common? Their answer [38]:

1. Sessions of at least five minutes. Trials with shorter sessions tended not to work.
2. A slow pace — or at least not a fast-only one. Fast-only protocols were less consistently effective.
3. Multiple sessions, and long-term practice rather than a one-off.
4. Guided, rather than "here's a PDF, good luck."
5. Uninterrupted. Interruptions, awkward standing setups and inadequate training for technical practices were the things that made otherwise promising interventions fail.

That list is worth reading twice, because it is the opposite of how most people try to breathe at work: one deep breath, once, when things are already on fire, and then the phone buzzes.

I'll say the product part once. Glimt exists because I wanted those five criteria to happen without having to remember them: a gentle prompt at an interval I choose, a guided slow pattern that runs five-plus minutes, repeated across the day, and held automatically whenever my microphone or camera is in use so it never interrupts a call. The research isn't about apps; it is about the dose. The app is just how I stopped skipping it.

A workday protocol you can start today

Free, in the browser, no account:

• Start of the day — five minutes at five in, five out. This is close to the six-breaths-per-minute resonance pace used in the HRV-biofeedback trials. Coherence breathing timer →
• Between meetings — four rounds of box breathing. Four in, four hold, four out, four hold. The evidence favours it when you need lower arousal before you perform. Box breathing timer →
• When it's already bad — cyclic sighing. Two inhales through the nose, one long exhale through the mouth, repeated for a couple of minutes. The most exhale-heavy of the Stanford protocols.
• End of the day — 4-7-8. A longer hold and exhale to come down from the last call. 4-7-8 timer →
• Sit up while you do it. The posture data says a slumped chest cannot take a full breath.
• Nose, not mouth, whenever you can.

All the patterns and the reasoning behind them are on the breathing exercises hub. If you're new to breathwork, read Tips for Safe and Effective Breathwork first — slow is safe; hyperventilation protocols are not for your desk, your car, or the bath.

What the research does not say

• Nobody has measured the productivity cost of shallow breathing as such. The cost figures above are for stress, engagement and mental health; breathing is one input to that state, not a separate line item.
• The "80% hold their breath at email" number is one person's informal observation of about 200 people. The controlled evidence for work-induced over-breathing is solid but smaller and less dramatic — a 1–2 mmHg CO₂ drop in an 11-person study, for instance [11].
• The breathwork effect sizes are small-to-medium in the broadest meta-analysis and large in the HRV-biofeedback subset. The trials are short, mostly small, and often at moderate risk of bias. Fincham's authors said it best: don't miscalibrate hype and evidence.
• The posture and low-CO₂ studies were done on healthy, mostly young adults. Effects in other populations may differ.
• Breathing is not a treatment for a clinical anxiety disorder, depression or hypertension. It is a well-evidenced daily practice that sits alongside treatment, not instead of it.

Sincerely, and with much love
@yornaath

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