The Energy Deficit Peaks After the Impact, Not During It The neurometabolic cascade of concussion follows a delayed peak pattern. At the moment of impact, ionic disruption begins. Over the next 24-72 hours, the brain's energy demand increases (to restore ionic balance) while energy supply decreases (from reduced cerebral blood flow). The gap between demand and supply is widest at days 3-5 post-injury. This is when symptoms are often most intense, not at the moment of injury or the following day (McCrory et al., 2017). This delayed peak confuses patients who felt "okay" on the day of injury and then felt significantly worse two days later. The pattern is normal. The initial presentation is often masked by adrenaline, the body's stress response to the injury event. As the adrenaline subsides and the metabolic deficit deepens, symptoms emerge more fully. The day 3-5 worsening is the neurometabolic reality revealing itself, not a sign that something new has gone wrong. The pattern of recovery after the peak is also non-linear. Good days are followed by worse days. Morning function differs from afternoon function. Cognitive exertion on one day produces physical symptoms the next. This fluctuation pattern is the hallmark of concussion recovery. The brain's energy supply is limited. Activities that exceed the available energy produce symptom flares. Rest restores some energy. The next activity draws from the partially restored supply. The oscillation continues until the energy supply normalizes, which occurs at days 10-14 for most adults. Activity Unmasks Secondary Dysfunction During complete rest, secondary system dysfunction is hidden. Cervicogenic symptoms require head movement to manifest. Autonomic symptoms require physical exertion to manifest. Vestibular symptoms require visual-vestibular challenge to manifest. During bed rest with minimal stimulation, none of these systems are challenged. The patient feels relatively stable (though not symptom-free). When activity resumes, each system is challenged, and each dysfunctional system produces symptoms. Returning to work unmasks cervicogenic headache (from sustained cervical posture). Walking unmasks autonomic dysfunction (from cardiovascular demand). Driving unmasks vestibular dysfunction (from visual-vestibular mismatch). The patient experiences a sudden worsening that coincides with increased activity and interprets the worsening as the concussion getting worse. The concussion is not getting worse. The activity is revealing dysfunction that rest was hiding. This unmasking is diagnostically valuable. The specific activities that worsen symptoms identify the specific systems that need treatment. Screen use worsening suggests visual-vestibular mismatch. Physical exertion worsening suggests autonomic dysregulation. Head movement worsening suggests cervical or vestibular dysfunction. The worsening pattern is a diagnostic map. Exercises for the Fluctuation Phase JME 155 Diaphragmatic breathing is the safest exercise during the symptom fluctuation phase. Breathing exercises do not increase metabolic demand on the brain. The parasympathetic activation from diaphragmatic breathing reduces the sympathetic overdrive that amplifies symptoms during the peak phase. Inhale 4 seconds, exhale 6 seconds. 10 breaths whenever symptoms intensify. This serves as both treatment (autonomic regulation) and symptom management (immediate calming effect). JME 14 Chin tucks at gentle intensity can begin during the fluctuation phase if they do not increase symptoms. The goal is preventing deep cervical flexor inhibition rather than aggressive cervical rehabilitation. 5 repetitions with 3-second holds. If symptoms increase, reduce to 3 repetitions or defer to the following week. The exercise should produce no symptom change or slight symptom reduction. JME 1 Gentle cervical rotation at 50% of normal range maintains cervical mobility without challenging the vestibular or autonomic systems. The movement should be slow (4 seconds per direction) and limited to the range that produces no symptom increase. 5 repetitions each direction. If rotation provokes dizziness, the vestibular system is involved and vestibular rehabilitation should be considered. JME 3 Lateral cervical flexion at gentle range addresses the scalene tension that begins immediately after concussion. The guarding pattern tightens the scalenes within hours. Early gentle stretching prevents the chronic tension pattern. 5 repetitions per side. The movement should feel like gentle release, not aggressive stretching. Start your 14-day free trial for phased concussion recovery programming. Progressive Exercises as Symptoms Stabilize JME 42 Shoulder mobility as symptoms begin stabilizing (typically week 2+) releases the protective shoulder elevation that developed during the acute phase. The tension in the upper trapezius and levator scapulae from guarding contributes to cervicogenic headache. Releasing the shoulders reduces the cervicogenic headache component. 8 repetitions. JME 153 Standing thoracic rotation as the patient tolerates more movement (week 2-3). Thoracic stiffness from reduced activity during the acute phase increases cervical loading and worsens cervicogenic symptoms. Restoring thoracic mobility reduces cervical compensation. 8 repetitions per direction. If standing rotation provokes dizziness, perform seated initially. JME 150 Seated thoracic rotation for patients returning to desk work or school. The seated version is less vestibularly challenging than standing rotation. Use during work or study breaks to prevent the sustained posture that worsens cervical and autonomic symptoms. 8 repetitions per direction every 60-90 minutes. JME 151 Lateral side bends with breathing in the progressive phase combine cervical-thoracic mobility with autonomic regulation. The exercise addresses the physical restrictions while the breathing component supports autonomic recovery. 8 repetitions per side with full diaphragmatic breathing. Navigate the ups and downs of recovery with simplmobility's phased concussion programs. Managing Symptom Fluctuations Track symptoms daily with a 0-10 rating. The fluctuation pattern becomes visible over days and weeks. Plotting symptoms reveals the overall trend (improving) even when individual days feel worse. Patients who track objectively recognize improvement that subjective perception misses. A day rated 6/10 after a week of 4-5/10 feels like worsening. But looking at the log showing consistent decline from 8/10 two weeks ago reveals the actual trajectory. Identify your energy envelope. The energy envelope is the amount of cognitive, physical, and emotional activity you tolerate before symptoms increase. Staying within the envelope (pacing) prevents the boom-bust cycle where overactivity produces crashes. The envelope expands as recovery progresses. Activities that pushed you over the threshold in week 2 will be within the envelope by week 4. Distinguish between "symptom increase during activity" and "symptom increase after activity." Mild symptom increase during activity that resolves within 30-60 minutes of rest is within the therapeutic zone. Symptom increase during activity that persists for hours or into the next day exceeds the therapeutic zone. The 30-60 minute resolution rule guides activity pacing during the fluctuation phase. Is it normal for concussion symptoms to get worse? Symptom fluctuation during recovery is normal. The day 3-5 peak, the good-day/bad-day oscillation, and the unmasking of secondary symptoms during activity resumption are all expected patterns. Symptoms that worsen progressively without any improvement over 2 weeks, or new symptoms appearing after initial improvement, warrant medical reassessment to rule out complications (subdural hematoma, post-traumatic hydrocephalus, or missed structural injury) (McCrory et al., 2017). Should I push through worsening symptoms? Do not push through significant worsening. The brain under metabolic stress does not benefit from additional demand. Mild symptom provocation (1-2 points on a 10-point scale) during controlled activity is acceptable and supports recovery. Significant worsening (3+ points) indicates the activity has exceeded the brain's current capacity. Reduce intensity and duration, not complete elimination. The goal is controlled symptom provocation, not symptom avoidance or symptom escalation. When should worsening symptoms concern me? Seek immediate evaluation for: worsening headache that becomes the worst headache of your life, new onset of vomiting after the initial 24 hours, seizure activity, increasing confusion or decreasing consciousness, clear fluid draining from the nose or ears, or new weakness on one side of the body. These indicate potential complications beyond concussion. Progressive worsening over days without any improvement is different from the fluctuation pattern and warrants medical reassessment. References McCrory, P., et al. (2017). Consensus statement on concussion in sport: the 5th International Conference on Concussion in Sport. British Journal of Sports Medicine, 51(11), 838-847. PubMed Silverberg, N. D., et al. (2020). Management of concussion and mild traumatic brain injury: a synthesis of practice guidelines. Archives of Physical Medicine and Rehabilitation, 101(2), 382-393. PubMed