Impact of mild dehydration on wellness and on exercise performance.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic search or meta-analytic methodology
PubMed 14681709 · doi:10.1038/sj.ejcn.1601897
What was done
This narrative review summarized evidence regarding the effects of chronic mild dehydration and acute fluid restriction on health, wellness, cognitive function, and exercise performance, particularly in vulnerable populations such as the elderly and individuals exercising in warm environments.
What was found
The abstract reports that fluid restriction leading to a 1–2% loss of body mass reduces subjective alertness and concentration while increasing self-reported tiredness and headache. For exercise lasting more than a few minutes, hypohydration impairs performance capacity, whereas muscle strength appears relatively unaffected. The abstract provides no specific quantitative effect sizes or statistical test values beyond the 1–2% body mass loss threshold.
Why it matters
It highlights that even subtle fluid deficits (1–2% body mass) meaningfully impair subjective cognitive wellness and aerobic exercise capacity, distinguishing endurance decrements from preserved short-term muscle strength.
Limits
The abstract is a narrative review that does not disclose search parameters, inclusion criteria, or the number of evaluated studies. Specific numerical effect sizes, variance estimates, and exact cognitive or athletic testing protocols are not reported.
Cited by
- supports Even a slight degree of dehydration can impair cognitive and physical performance.
- supports Even mild or slight dehydration can diminish cognitive and physical performance.