body
Physical Endurance Decrease
Adverse effectPhysical Endurance Decrease is an adverse outcome in which a person can sustain physical activity or exercise for less time or at a lower capacity than expected. It refers to reduced exercise tolerance, rather than an improvement in stamina.
Learn what Physical Endurance Decrease refers to and how it fits within body-related wellness information.
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.
Ice Bath / Cold PlungepracticeUnclear
Based on one study. Strongest study: a systematic review of studies.
A pooled review of randomized trials found that cold-water immersion reduced anaerobic average power by 2.4% in healthy participants.
Open the Ice Bath / Cold Plunge pageHot BathpracticeUnclear
Based on one study.
A hot bath shortly before exercise raises core body temperature, so the body may reach its heat limit sooner and endurance and power output may drop until it cools down.
Open the Hot Bath pageHot Yogapracticesimple.meter.userReports
Based on one study.
Open the Hot Yoga page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on3 listedHighest probability
- →PracticesIce Bath / Cold PlungeCertaintyLowSourceClinical1 other source
A pooled review of randomized trials found that cold-water immersion reduced anaerobic average power by 2.4% in healthy participants.
Who was studied
- Healthy people
Open Ice Bath / Cold PlungeStudy result
cold water immersion (CWI) resulted in a 2.4% detriment in yield (anaerobic average power, WAnT)
- →PracticesHot BathCertaintyLowSourceReference knowledge1 other source
A hot bath shortly before exercise raises core body temperature, so the body may reach its heat limit sooner and endurance and power output may drop until it cools down.
Open Hot BathStudy result
A hot bath shortly before exercise raises core body temperature, so the body reaches its heat limit sooner and endurance and power output drop until it cools down.
- →PracticesHot YogaCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 2 of 312 Reddit reports discussing it.
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
Physical Endurance Decrease is an adverse outcome in which a person can sustain physical activity or exercise for less time or at a lower capacity than expected. It refers to reduced exercise tolerance, rather than an improvement in stamina. The experience may be noticed as reaching physical limits sooner during activity.
How interventions help
Physical endurance can decrease through different pathways. Cigarette Smoking is described as reducing lung function, oxygen delivery, and cardiovascular efficiency, so the limitation spans breathing, circulation, and the ability to sustain exercise. Other reports suggest that endurance may also fall when an intervention produces excessive vasodilation or gastrointestinal side effects, as described for Citrulline.
The timing of an intervention matters. In the Rhodiola Rosea finding, the regimen was 1500 mg/day for 3 days followed by 500 mg acute, with the change observed after the 3-day period and acute intake. The reported result was an approximately 8% decrease versus placebo (p<0.001, d=1.90), indicating that the effect appeared with a short preparation period plus an acute dose rather than requiring long-term continuous use.
Berberine and Citrulline are represented by user reports rather than a defined regimen showing when the effect begins or whether it persists after stopping. Across these interventions, the available descriptions therefore point to distinct possibilities: sustained physiological constraints affecting oxygen use and exercise capacity, a short-term response after a specified regimen, or individual reactions that may be linked to tolerability-related effects. The findings do not establish that endurance changes in the same way, or for the same duration, across all interventions.
Choosing guidance
These options are not interchangeable. Cigarette Smoking represents an exposure associated with reduced endurance, whereas Rhodiola Rosea, Berberine, and Citrulline are supplement-related options with less consistent or less established relevance to this outcome. Someone trying to avoid a known contributor to reduced endurance should not treat the supplement entries as alternatives to addressing Cigarette Smoking.
Rhodiola Rosea is the only supplement option assessed in a controlled clinical study, but the result came from a brief regimen with an acute component and a small, narrowly characterized study population. That makes it more informative for a short-term response under similar conditions than for longer-term use or for people outside the studied population. It also means the result should not be assumed to represent a persistent effect.
Berberine and Citrulline are less suitable for decisions based on firm expectations about endurance. Their entries reflect user reports rather than a controlled clinical comparison, so they provide limited information about how quickly an effect might appear, how much exposure would be needed, or whether the same experience would occur consistently. The differing evidence types also make direct comparisons between these options unreliable.
Overall, the choices suit different levels of certainty: Cigarette Smoking is a clearly relevant exposure, Rhodiola Rosea has limited short-term controlled evidence, and Berberine and Citrulline have anecdotal signals that are difficult to generalize. Personal health status, intended duration, and any symptoms occurring during use would be important when interpreting these options.