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High-Intensity Interval Training (HIIT) and Glaucoma: Short Bouts, Big Questions · Glaucoma, Vision & Longevity: Supplements & Science

• 0:00
  SPEAKER_00: High intensity interval training, AED tin glaucoma, short bouts, big questions.
• 0:05
  SPEAKER_00: Glaucoma is a serious eye condition often linked to high intraocular pressure, IOP, the fluid pressure inside the eye.
• 0:13
  SPEAKER_00: Managing IOP is key in preventing optic nerve damage.
• 0:16
  SPEAKER_00: Many patients wonder if lifestyle changes like exercise can help.
• 0:20
  SPEAKER_00: In fact, physical activity is generally good for eye health.
• 0:24
  SPEAKER_00: Regular aerobic workouts tend to lower IOP and improve blood flow around the optic nerve.
• 0:29
  SPEAKER_00: High-intensity interval training is a popular time-efficient workout that boosts heart and metabolic health.
• 0:36
  SPEAKER_00: But is HIIT safe for people with glaucoma?
• 0:39
  SPEAKER_00: We review the evidence on how short bursts of intense activity affect eye pressure.
• 0:44
  SPEAKER_00: In general, brief high-intensity exercise can reduce IOP over the long run, but very all-out efforts or improper form can cause transient spikes.
• 0:54
  SPEAKER_00: Understanding the balance of benefits and risks can help glaucoma patients choose the right exercise plan.
• 1:00
  SPEAKER_00: HIT and cardiovascular health.
• 1:03
  SPEAKER_00: HIT involves repeated short bursts of intense exercise, often 80 to 100% of maximum effort, alternated with brief rest or low intensity periods.
• 1:13
  SPEAKER_00: Because you sweat hard for only a few minutes at a time, HIT workouts typically take much less time than traditional steady-state cardio.
• 1:21
  SPEAKER_00: Major health groups note that HIT can produce the same heart and metabolism benefits as longer workouts, but with less total training time.
• 1:29
  SPEAKER_00: For example, a review of exercise guidelines found HEAT consumes less overall time per week while achieving comparable gains in fitness and cardiometabolic risk factors.
• 1:41
  SPEAKER_00: It can improve cholesterol, blood sugar control, and aerobic fitness more quickly than moderate exercise.
• 1:47
  SPEAKER_00: For busy people, this efficiency is a big plus.
• 1:51
  SPEAKER_00: A few simple HIT sessions each week, even two 20-minute routines, can significantly boost cardiovascular health.
• 1:58
  SPEAKER_00: Switching between fast running, cycling sprints, jump ropes, or bodyweight moves with short breaks elevates heart rate and metabolism.
• 2:06
  SPEAKER_00: Studies in various groups show that ET programs can raise VO2 max and lower risk factors for diabetes and heart disease, often matching or exceeding steady exercise results.
• 2:18
  SPEAKER_00: In short, if time is limited, HIT TIT offers a powerful workout.
• 2:22
  SPEAKER_00: However, HIT's intensity means it strongly activates the sympathetic nervous system, the fight or flight response.
• 2:29
  SPEAKER_00: This triggers high adrenaline, fast breathing, and surges in blood pressure during each effort.
• 2:35
  SPEAKER_00: Usually these spikes are short-lived and healthy vessels quickly adapt.
• 2:39
  SPEAKER_00: But for glaucoma patients, those transient peaks can cause a sharp but brief rise in IOP.
• 2:45
  SPEAKER_00: We will review evidence of both the positive long-term eye effects and the potential short-term eye pressure risks of HIT.
• 2:51
  SPEAKER_00: Exercise and intraocular pressure.
• 2:54
  SPEAKER_00: Drops and spikes.
• 2:56
  SPEAKER_00: Overall, physical activity tends to lower IOP after exercise.
• 3:00
  SPEAKER_00: Most forms of aerobic work, running, cycling, swimming, brisk walking, produce a modest drop in eye pressure for a few hours afterwards.
• 3:08
  SPEAKER_00: The exact mechanism isn't fully known, but likely factors include faster fluid outflow and improved blood perfusion, helping the eye drain aqueous humor.
• 3:17
  SPEAKER_00: For example, one study found that running a marathon lowered IOP by an average of 2.25 millimeter harams in runners, with larger drops seen in those with higher baseline IOP.
• 3:28
  SPEAKER_00: Even mild jogging or brisk walking can reduce IOP by a couple of millimeters for a time post-exercise.
• 3:35
  SPEAKER_00: HIT seems to follow the same trend if done properly.
• 3:38
  SPEAKER_00: In one controlled experiment, young men did repeated 30-meter sprints with short rests.
• 3:44
  SPEAKER_00: Both a lower fatigue version, longer 60-second rest, and a high fatigue version, 30-second rest, produced immediate reductions in IOP compared to walking.
• 3:54
  SPEAKER_00: The longer rest protocol actually resulted in slightly greater IOP drop during the later sprints.
• 4:00
  SPEAKER_00: In all cases, IOP fell during the intense sessions, suggesting that HIT can acutely lower eye pressure.
• 4:07
  SPEAKER_00: The authors concluded that time-efficient HIT can be recommended because it acutely reduced IOP.
• 4:14
  SPEAKER_00: In practical terms, this means after a short high-intensity set, glaucoma patients might see their IOP go down for the next hour or two, similar to after a longer jog.
• 4:24
  SPEAKER_00: Another study of continuous high-intensity exercise, 85% max effort, found that a 25-minute aerobic session significantly reduced IOP in healthy subjects during the exertion.
• 4:36
  SPEAKER_00: In summary, the post-exercise effect of harder cardiovascular workouts appears to be beneficial for lowering IOP in the short term, immediately after exercise.
• 4:46
  SPEAKER_00: This is promising because periods of lowered eye pressure may help protect the optic nerve over time.
• 4:52
  SPEAKER_00: However, intense exercise can also cause brief spikes in IOP during the actual exertion, particularly with certain moves or mistakes.
• 5:00
  SPEAKER_00: Heavy resistance training and all-out efforts pose the most risk.
• 5:05
  SPEAKER_00: For example, one study monitored people doing heavy leg presses, one rep max sets.
• 5:10
  SPEAKER_00: It found IOP shot up by about 200%, roughly plus 26 mm, while pushing, then quickly returned to normal after stopping.
• 5:20
  SPEAKER_00: Similarly, bench press exercises have been shown to acutely raise eye pressure, especially when performers hold their breath, the valsalva maneuver, for extra force.
• 5:30
  SPEAKER_00: In other words, every effort to lift very heavy weights, especially with breath holding or straining, can drive IOP sky high for seconds.
• 5:39
  SPEAKER_00: Most of these peaks are momentary, but repetitive spikes may stress vulnerable optic nerves.
• 5:44
  SPEAKER_00: Besides weightlifting, any all-out sprint or interval with intense strain could briefly raise IOP.
• 5:50
  SPEAKER_00: The common factor is a super high blood pressure and chest pressure.
• 5:54
  SPEAKER_00: When you push hard, your heart pumps and blood pressure surges.
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  SPEAKER_00: That blood pressure pushes against the walls of the eyeball, raising IOP momentarily.
• 6:03
  SPEAKER_00: If you also hold your breath to brace, like lifting a very heavy weight or sprinting uphill, intra-abdominal pressure and chest pressure increase too, which can further elevate IOP.
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  SPEAKER_00: This is known as the val salva effect.
• 6:16
  SPEAKER_00: Overall, strenuous efforts can produce a U-shaped IOP curve, a brief spike during the exertion followed by a post-exercise drop.
• 6:24
  SPEAKER_00: Hydration is another factor.
• 6:26
  SPEAKER_00: Dehydration during long workouts can cause IOP to fall even more, whereas staying well hydrated tends to keep IOP more stable.
• 6:35
  SPEAKER_00: One review noted that in dehydrating exercise, IOP progressively dropped, but when hydration was maintained, it stayed roughly steady.
• 6:43
  SPEAKER_00: Thirsty muscles mean less fluid overall, so the eyes also volume deplete slightly.
• 6:48
  SPEAKER_00: After exercise, if you rehydrate well, IOP tends to return to normal.
• 6:53
  SPEAKER_00: For safety, glaucoma patients should maintain good fluid intake and avoid heavy dehydration, especially in heat, though you wouldn't over-drink either, since a water drinking test can cause a spike in certain glaucoma cases.
• 7:07
  SPEAKER_00: Balancing HIP work-to-rest ratios and intensity.
• 7:10
  SPEAKER_00: Putting this together, HIIT workouts can be beneficial for glaucoma patients if designed carefully.
• 7:16
  SPEAKER_00: The key is to maximize the IOP lowering effects while minimizing dangerous spikes.
• 7:21
  SPEAKER_00: Work-rest ratio.
• 7:23
  SPEAKER_00: Studies suggest that longer rest periods between sprints help lower IOP.
• 7:28
  SPEAKER_00: In the sprint study mentioned earlier, using 60 seconds rest instead of 30 gave a slightly better IOP drop.
• 7:34
  SPEAKER_00: Clinically, a 1-2 or 1-3 work-to-rest ratio.
• 7:38
  SPEAKER_00: For example, 30 seconds of heart effort followed by 60 to 90 seconds of gentle recovery is often safer and still effective.
• 7:46
  SPEAKER_00: Short rest or back-to-back all-out bursts may accumulate fatigue and elevate IOP more.
• 7:52
  SPEAKER_00: Intensity cap.
• 7:54
  SPEAKER_00: Keep each burst truly intense but not to absolute max.
• 7:57
  SPEAKER_00: If you measure by heart rate, try to peak around 80 to 90% of your age predicted maximum, not 100%.
• 8:04
  SPEAKER_00: Using a monitor can help you stop just before reaching your absolute limit, which lowers the strain on blood pressure.
• 8:11
  SPEAKER_00: On the Borg RPE, rate of perceived exertion scale, aim for an effort of about 7 to 8 out of 10, not a full 10.
• 8:19
  SPEAKER_00: This moderate upper limit helps avoid pushing to failure or breathlessness, which are associated with IOP spikes.
• 8:27
  SPEAKER_00: Breathing technique.
• 8:29
  SPEAKER_00: Never hold your breath during effort.
• 8:31
  SPEAKER_00: Keep breathing steadily.
• 8:32
  SPEAKER_00: Exhale during the hardest part of the movement or sprint.
• 8:36
  SPEAKER_00: Avoid the valsalva maneuver.
• 8:38
  SPEAKER_00: Normal breathing, in through nose, out through mouth, helps reduce intrathoracic pressure and blunt the surge in eye pressure.
• 8:45
  SPEAKER_00: Instructors often remind even weightlifters exhale on the exertion.
• 8:50
  SPEAKER_00: This is even more important if you have glaucoma.
• 8:53
  SPEAKER_00: Hydration.
• 8:54
  SPEAKER_00: Drink water before, during, and after hit.
• 8:57
  SPEAKER_00: Avoid starting in a dehydrated state.
• 9:00
  SPEAKER_00: Sip rather than gulp to prevent any sudden IOP rise from guzzling water.
• 9:04
  SPEAKER_00: A small amount of water between intervals, if practical, can help maintain optimal bodily fluids without flooding the system at once.
• 9:11
  SPEAKER_00: Good hydration also keeps blood volume stable, which prevents exaggerated pressure swings.
• 9:17
  SPEAKER_00: Recovery monitoring.
• 9:18
  SPEAKER_00: After each hit session, spend 5 to 10 minutes cooling down with gentle activity.
• 9:24
  SPEAKER_00: Check that your heart rate and breathing return to near normal before stopping.
• 9:28
  SPEAKER_00: Use recovery heart rate, how quickly your pulse drops after peak, as a guide.
• 9:33
  SPEAKER_00: If your heart rate stays very high for minutes or you feel dizzy, slow down or extend the cooldown.
• 9:40
  SPEAKER_00: Some guides say a good recovery is dropping 20 beats in 1 to 2 minutes.
• 9:44
  SPEAKER_00: Less than that might mean skip the next high-intensity interval.
• 9:48
  SPEAKER_00: Additionally, you might consider having your eye pressure measured or monitor symptoms a few hours after first trying hit to ensure it does not remain elevated.
• 9:58
  SPEAKER_00: Proportional load.
• 10:00
  SPEAKER_00: If using hills, bikes, or rowing, choose a moderate resistance.
• 10:03
  SPEAKER_00: The MDPI review notes that lighter loads tended to let IOP fall, whereas heavier loads could push it up.
• 10:10
  SPEAKER_00: In practice, sprinting at 85% max speed on flat ground or gentle gradient is safer than pushing a heavy stationary bike sprint at 100% resistance.
• 10:20
  SPEAKER_00: Overall, design your hit so that each high intensity interval is truly intense but controlled, and each recovery is long enough to let you breathe.
• 10:30
  SPEAKER_00: For example, try 30-second sprints with 90-second walking or slow pedal.
• 10:35
  SPEAKER_00: Or 20-second hard cycling with 40-second easy.
• 10:39
  SPEAKER_00: Let the heart slow before the next burst.
• 10:41
  SPEAKER_00: This way, exercise stays vigorous but safer for IOP.
• 10:46
  SPEAKER_00: Steady state versus hit.
• 10:48
  SPEAKER_00: A patient's guide.
• 10:50
  SPEAKER_00: Choosing between HIT and longer, steady state workouts depends on your situation.
• 10:54
  SPEAKER_00: Busy schedule or motivated by time.
• 10:57
  SPEAKER_00: Heat may win out.
• 10:58
  SPEAKER_00: If you have only 15 to 20 minutes to exercise, PIC can give big health dividends.
• 11:03
  SPEAKER_00: If your glaucoma is well controlled and you have no serious circulation issues, brief hit under the above precautions could be a good fit.
• 11:10
  SPEAKER_00: Concern about sudden spikes.
• 11:12
  SPEAKER_00: Traditional moderate exercise, like 30 to 60 minutes of brisk walking, cycling at comfortable pace, swimming, is gentler on IOP spikes.
• 11:20
  SPEAKER_00: If your glaucoma is advanced or your eye pressure is hard to control, a slower workout might feel safer.
• 11:26
  SPEAKER_00: Moderate cardio still lowers IOP post-exercise without large transient peaks.
• 11:33
  SPEAKER_00: Fitness in age.
• 11:34
  SPEAKER_00: Younger, fitter individuals may recover faster from HITS demands and handle blood pressure swings better.
• 11:40
  SPEAKER_00: Older adults or those with joint cardiac issues might prefer low-impact steady workouts or lower volume interval sessions, gentle intervals like walk three-min, jog one min repeat instead of full sprint.
• 11:54
  SPEAKER_00: Cardiometabolic risk factors.
• 11:56
  SPEAKER_00: If you have conditions like diabetes, obesity, or heart disease risk, HIT's efficiency can be very helpful.
• 12:02
  SPEAKER_00: Studies show HIT often improves glucose control and fitness more in less time than moderate exercise.
• 12:09
  SPEAKER_00: On the other hand, if you have label blood pressure or vascular disease, gradually building up to heat might be safer, perhaps after medical clearance.
• 12:18
  SPEAKER_00: Enjoyment and adherence.
• 12:20
  SPEAKER_00: Some people simply dislike long workouts and are more likely to stick with short bursts.
• 12:26
  SPEAKER_00: Others find HIT too intense and prefer a steady jog or bike ride, they can chat through.
• 12:32
  SPEAKER_00: What you enjoy is what you'll do consistently, which matters for eye health too.
• 12:37
  SPEAKER_00: Decision tips get doctors okay.
• 12:39
  SPEAKER_00: Always discuss new exercise regimens with your eye doctor or primary care provider.
• 12:44
  SPEAKER_00: They can help gauge whether your glaucoma is stable enough for vigorous efforts.
• 12:48
  SPEAKER_00: Start easy.
• 12:49
  SPEAKER_00: If trying hit, begin with one or two intervals in a session, not a full routine, and see how you feel.
• 12:56
  SPEAKER_00: Eat well, hydrate, and monitor vision or eye aches.
• 13:00
  SPEAKER_00: If all is well, gradually add more intervals or sessions per week.
• 13:04
  SPEAKER_00: Monitor IOP.
• 13:05
  SPEAKER_00: If possible, have regular IOP checks scheduled and mention your workout routine to your ophthalmologist.
• 13:10
  SPEAKER_00: If your IOP ever rises unexpectedly, discuss exercise adjustments.
• 13:15
  SPEAKER_00: Listen to your body.
• 13:16
  SPEAKER_00: If you experience vision changes, eye pain, or severe headache during or after HIT, stop and seek advice.
• 13:22
  SPEAKER_00: These could signal dangerously high IOP or blood pressure spikes.
• 13:26
  SPEAKER_00: Blend approaches.
• 13:28
  SPEAKER_00: A combined approach often works.
• 13:30
  SPEAKER_00: For instance, do HIT one to two days a week and moderate cardio other days.
• 13:35
  SPEAKER_00: This keeps activity high without relying exclusively on intense sessions.
• 13:39
  SPEAKER_00: Both steady state and heat can be part of a healthy lifestyle.
• 13:43
  SPEAKER_00: Steady state exercise is tried and true for eye pressure control, while heat adds powerful metabolic benefits for busy people.
• 13:50
  SPEAKER_00: The best choice depends on your overall health, risk tolerance, and personal preference.
• 13:55
  SPEAKER_00: Having a personalized plan, perhaps crafted with a trainer or physical therapist aware of glaucoma precautions, is ideal.
• 14:02
  SPEAKER_00: What the research says.
• 14:05
  SPEAKER_00: Consistent findings.
• 14:06
  SPEAKER_00: Multiple studies confirm that dynamic aerobic exercise, running, cycling, swimming, etc., causes a short-term decrease in IOP.
• 14:14
  SPEAKER_00: In general, higher intensity and longer duration yield somewhat greater IOP reductions up to a point, provided proper breathing and hydration are maintained.
• 14:24
  SPEAKER_00: Interval design matters.
• 14:26
  SPEAKER_00: Research like Vera et al., 2019, shows that a well-designed high T session lowers IOP even after very brief workouts.
• 14:34
  SPEAKER_00: Specifically, allowing enough recovery between sprints appears important.
• 14:38
  SPEAKER_00: Protocols with a 2-1 rest ratio induced more IOP reduction than 1-1 rest.
• 14:44
  SPEAKER_00: This suggests glaucoma-safe hit should favor slightly longer rest.
• 14:49
  SPEAKER_00: Resistance exercise risk.
• 14:51
  SPEAKER_00: Studies of isometric or resistance training consistently show acute IOP spikes during effort.
• 14:57
  SPEAKER_00: However, they generally note that IOP returns to baseline or below afterward.
• 15:02
  SPEAKER_00: Thus, occasional weightlifting, especially if done correctly, is not necessarily forbidden, but heavy lifts to failure or breath holding should be avoided.
• 15:11
  SPEAKER_00: Long-term benefit.
• 15:12
  SPEAKER_00: There is evidence that being physically fit and active may reduce long-term glaucoma risk.
• 15:18
  SPEAKER_00: A large cohort study found that people who were both aerobically active and fit had a significantly lower incidence of glaucoma than those who were inactive or unfit.
• 15:28
  SPEAKER_00: Regular exercise may thus complement eye drops and other treatments.
• 15:32
  SPEAKER_00: Lacking conclusive guidelines, currently no eye care body issues, specific HT rules for glaucoma.
• 15:39
  SPEAKER_00: Much of what we know comes from small studies and general exercise science.
• 15:44
  SPEAKER_00: Ongoing trials, like the HIT glaucoma study, aim to clarify HIT's effects on eye health.
• 15:50
  SPEAKER_00: Until more data are in, the best approach is cautious optimism.
• 15:54
  SPEAKER_00: Combine exercise's known benefits with reasonable safeguards.
• 15:58
  SPEAKER_00: Conclusion.
• 15:59
  SPEAKER_00: Exercise's medicine holds true in glaucoma too.
• 16:02
  SPEAKER_00: When chosen carefully, HIT can be part of a glaucoma-safe fitness plan.
• 16:06
  SPEAKER_00: Its strong cardiometabolic benefits and time efficiency are attractive, and emerging research shows well-managed heat tea can even lower IOP immediately after workouts.
• 16:17
  SPEAKER_00: The trade-off is that very intense efforts and poor technique may briefly spike IOP, so precautions are justified.
• 16:24
  SPEAKER_00: In practice, many people with glaucoma may find they can enjoy HIT a few times a week, short bursts at around 80 to 90% effort, with good hydration, breathing, and plenty of rest between intervals.
• 16:36
  SPEAKER_00: On alternate days, a moderate walk or bike ride can complement this approach.
• 16:40
  SPEAKER_00: The safest path is individualized.
• 16:43
  SPEAKER_00: Consider your glaucoma stability, overall health, and lifestyle.
• 16:47
  SPEAKER_00: For some, simple steady cardio will suffice.
• 16:50
  SPEAKER_00: For others, HIT can safely amplify the gains.
• 16:53
  SPEAKER_00: Ultimately, staying active is the goal.
• 16:56
  SPEAKER_00: As research continues, glaucoma patients and their doctors can tailor exercise plans, whether it's brisk walking for 30 minutes or a quick HIT circuit to keep both the body and eyes as healthy as possible.
• 17:09
  SPEAKER_00: All links to sources are available in the text version of this article.
• 17:13
  SPEAKER_00: You can find the full article at VisualFieldtest.com.
• 17:17
  SPEAKER_00: Thanks for listening.
• 17:18
  SPEAKER_00: To check your visual field, click the link at the bottom of this article or visit visualfieldtest.com.