health
Muscle Breakdown (Rhabdomyolysis)
Adverse effectMuscle Breakdown (Rhabdomyolysis) is an adverse health outcome involving muscle breakdown and is associated with increases in CK and LDH. It is distinct from a general exercise-related response: the outcome specifically refers to rhabdomyolysis, rather than simply changes measured after activity.
Understand what Muscle Breakdown (Rhabdomyolysis) refers to and how it is categorized as a health effect.
These are research findings, not promises. Most options have little evidence, and results differ from person to person.
What can cause it
How likely each one is to cause it, most likely first.
High-Intensity Interval Training (HIIT)practicePossible
Based on 4 studies. Strongest study: a randomized controlled trial.
Open the High-Intensity Interval Training (HIIT) pageFastingpracticeUnclear
Based on 2 studies. Strongest study: a systematic review of studies.
A 2026 systematic review reported a decline in muscle strength among sedentary older adults during Ramadan. The reported finding concerns strength and does not describe rhabdomyolysis.
Open the Fasting pageHot YogapracticeUnclear
Based on one study.
Excessive exertion in heat, especially in unconditioned individuals, can damage skeletal muscle and release myoglobin, creating a risk of acute kidney injury.
Open the Hot Yoga pageCyclingpracticeUnclear
Based on one study.
Unaccustomed, very hard cycling, such as a first indoor spin class, can damage muscle fibres and release myoglobin into the blood; this exertional rhabdomyolysis can harm the kidneys.
Open the Cycling pageFinnish SaunapracticeUnclear
Based on one study.
Pharmacology references note that severe overheating and dehydration, especially after hard exercise or with alcohol, can damage muscle cells (rhabdomyolysis); this is rare with normal sauna use.
Open the Finnish Sauna pageJump Rope TrainingpracticeUnclear
Based on one study.
Unaccustomed long or very intense Jump Rope Training sessions repeatedly load the calf muscles eccentrically and can rarely cause exertional rhabdomyolysis.
Open the Jump Rope Training pageTabata TrainingpracticeUnclear
Based on one study.
Open the Tabata Training pageCardiopracticeUnclear
Based on one study. Strongest study: a narrative review.
A review noted elevated inflammatory mediators, including IL-6, leukocytes, and creatine kinase after high-intensity exercise; these findings do not by themselves establish rhabdomyolysis.
Open the Cardio page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on10 listedHighest probability
- →PracticesHigh-Intensity Interval Training (HIIT)CertaintyMediumSourceClinical4 other sources
A review of randomized trials reported creatine kinase elevation, which is not itself a report of rhabdomyolysis. Separately, an RCT of 71 participants found that, compared with MICT, lean mass (P = 0.01, Cohen's d = 0.904) and muscle mass (P = 0.01, Cohen's d = 0.857) decreased in the HIIT group after 12 weeks of training (MD -0.51 kg).
Who was studied
- People with a condition
- Heart Disease
- Obesity
- Overweight
- Prediabetes
Open High-Intensity Interval Training (HIIT)Study result
Creatine kinase elevation
Low probability(9)
- →PracticesFastingCertaintyLowSourceClinical2 other sources
A 2026 systematic review reported a decline in muscle strength among sedentary older adults during Ramadan. The reported finding concerns strength and does not describe rhabdomyolysis.
Who was studied
- Healthy people and patients
Open FastingStudy result
Decline in muscle strength in sedentary older adults during Ramadan
- →PracticesHot YogaCertaintyLowSourceReference knowledge1 other source
Excessive exertion in heat, especially in unconditioned individuals, can damage skeletal muscle and release myoglobin, creating a risk of acute kidney injury.
Open Hot YogaStudy result
Excessive exertion in heat, especially in unconditioned individuals, can cause skeletal muscle damage and myoglobin release, risking acute kidney injury.
- →PracticesCyclingCertaintyLowSourceReference knowledge1 other source
Unaccustomed, very hard cycling, such as a first indoor spin class, can damage muscle fibres and release myoglobin into the blood; this exertional rhabdomyolysis can harm the kidneys.
Open CyclingStudy result
Unaccustomed, very hard cycling (for example a first indoor spin class) can damage muscle fibres enough to release myoglobin into the blood (exertional rhabdomyolysis), which can harm the kidneys.
- →PracticesFinnish SaunaCertaintyLowSourceReference knowledge1 other source
Pharmacology references note that severe overheating and dehydration, especially after hard exercise or with alcohol, can damage muscle cells (rhabdomyolysis); this is rare with normal sauna use.
Open Finnish SaunaStudy result
Severe overheating and dehydration, especially after hard exercise or with alcohol, can damage muscle cells (rhabdomyolysis); rare with normal sauna use.
- →PracticesJump Rope TrainingCertaintyLowSourceReference knowledge1 other source
Unaccustomed long or very intense Jump Rope Training sessions repeatedly load the calf muscles eccentrically and can rarely cause exertional rhabdomyolysis.
Open Jump Rope TrainingStudy result
Unaccustomed long or very intense jump rope sessions put repeated eccentric load on the calf muscles, which can rarely cause exertional rhabdomyolysis.
- →PracticesTabata TrainingCertaintyLowSourceReference knowledge1 other source
Unaccustomed or excessively intense interval exercise can rarely cause severe muscle breakdown and rhabdomyolysis.
- →PracticesCardioCertaintyLowSourceReview1 other source
A review noted elevated inflammatory mediators, including IL-6, leukocytes, and creatine kinase after high-intensity exercise; these findings do not by themselves establish rhabdomyolysis.
Open CardioStudy result
Elevated inflammatory mediators (e.g., IL-6), leukocytes, and creatine kinase after high-intensity exercise
- →PracticesMassageCertaintyLowSourceReview1 other source
A review described muscle damage when high compressive force (~7.6 N) was applied to aged atrophic muscle.
Open MassageStudy result
Muscle damage induced by high compressive force (~7.6 N) applied to aged atrophic muscle
- →PracticesStrength TrainingCertaintyLowSourceReview1 other source
A 2025 review in healthy people described muscle damage with elevated CK levels.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Muscle Breakdown (Rhabdomyolysis) is an adverse health outcome involving muscle breakdown and is associated with increases in CK and LDH. It is distinct from a general exercise-related response: the outcome specifically refers to rhabdomyolysis, rather than simply changes measured after activity. It has been linked with examples including Cycling, Tribulus Terrestris, Caffeine, and Spirulina.
How interventions help
The interventions associated with muscle breakdown differ in how the exposure occurs. Cycling represents exertional stress, with changes appearing 24–48 h after exercise: all protocols increased CK and LDH, and the greatest increases occurred with HI (p<0.05). This indicates that the outcome may become apparent after the activity rather than during it, and that protocol intensity can matter.
The other associations involve less routine circumstances. Tribulus Terrestris and Spirulina are linked to individual clinical reports of rhabdomyolysis, while Caffeine is associated with this outcome in the setting of severe intoxication, particularly when seizures, extreme agitation, or prolonged exertion are present. These patterns should not be read as evidence that ordinary use inevitably produces muscle breakdown; they describe circumstances in which the outcome has been reported.
Yoga illustrates a different exertional pattern. Rare cases have followed extreme, prolonged, or heated sessions, especially when inexperienced participants exceed their conditioning. Across these examples, the shared concern is a mismatch between physical stress and tolerance, or an unusually intense exposure. The information does not establish a common duration of use, a dose threshold, or whether the effect persists after stopping. It also does not show that any of these interventions treats muscle breakdown; here they are being described as possible contributors to the outcome.
Choosing guidance
These options are not interchangeable. Cycling is the clearest exercise-related consideration because the findings concern exercise protocols and show that muscle-injury markers increased 24–48 h after exercise, with the greatest increases in HI. It is most relevant to people comparing training intensity or recovery after demanding exercise, rather than to someone seeking a general supplement choice.
Tribulus Terrestris, Caffeine, and Spirulina have much less direct evidence for this outcome. The finding for Tribulus Terrestris comes from a single human case, while the concern with Caffeine is described in pharmacology references in the setting of severe intoxication, particularly when seizures, extreme agitation, or prolonged exertion are involved. Spirulina is linked to acute rhabdomyolysis in a review, but the available information does not establish how much was taken, how long it was used, or how quickly risk might appear.
Yoga may suit people choosing a lower-intensity activity, but the reported concern is tied to extreme, prolonged, or heated practice, especially when inexperienced participants exceed their conditioning. The evidence is theoretical rather than a basis for judging ordinary practice. Across the options, the findings do not provide a reliable dose, duration, or time-to-onset comparison for the non-exercise choices, and they do not establish that every use or session carries the same concern. People comparing options should therefore distinguish ordinary use or training from unusually intense exposure, and should not treat these findings as directly equivalent.