Short term physiological changes
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Short-Term Physiological Changes in Response to Environmental and Internal Stressors
Heat Stress in Dairy Cows: Short-Term Physiological Adaptations
When dairy cows are exposed to moderate heat stress, even in temperate climates, they show several short-term physiological changes. These include increased vaginal temperature, higher heart rate, elevated plasma glucose, and increased milk cortisol levels. At the same time, there is a decrease in plasma thyroid hormones (thyroxine and triiodothyronine) and a reduction in sodium concentration in milk. These changes reflect the cows’ immediate response to heat and can be used to monitor heat stress non-invasively through milk analysis .
Cardiac Function: Short-Term Effects of Ventricular Dyssynchrony
Short-term physiological changes in the heart, such as those caused by left ventricular dyssynchrony, can lead to immediate alterations in cardiac metabolism and mitochondrial function. These changes may include metabolic remodeling, ATP deficiency, impaired contractility, and the early stages of structural rearrangement in heart tissue. Such short-term disruptions can set the stage for longer-term heart failure if not addressed .
Plant Physiology: Rapid Responses to Salinity Changes
Plants like Ruppia maritima respond to short-term changes in salinity with immediate shifts in leaf tissue osmolality, compatible solute synthesis (such as proline and soluble carbohydrates), and photosynthetic efficiency. These changes occur within minutes to hours and help the plant adjust to both increases and decreases in external ion concentrations, although both are initially stressful .
Microbial Communities: Temperature and Moisture Effects
Soil microbes show short-term physiological changes when exposed to shifts in temperature and moisture. Microbial carbon use efficiency (CUE) generally increases with temperature but decreases under high moisture and low oxygen conditions. These changes are mainly driven by microbial growth rates rather than respiration, and they occur across different soil types and land uses .
Fish and Aquatic Life: Oxygen Fluctuations and Habitat Use
Fish species exposed to short-term drops in dissolved oxygen display physiological responses such as changes in metabolic rates and oxygen supply capacity. These responses are closely linked to their ability to survive in low-oxygen environments and influence their habitat choices over short periods, sometimes forcing them to move to avoid harmful conditions .
Emotional and Psychological Stress: Heart Rate Variability
Short-term psychological stress, such as that induced by social stress tests, leads to measurable physiological changes. Heart rate variability (HRV) and pulse rate variability (PRV) increase during and after stressful events, reflecting the body’s response to negative emotions and stress. These changes are significant and can be detected using non-invasive sensors, although care should be taken in interpreting them as direct indicators of mental health threats 69.
Thermal Environment Transitions: Human Adaptation
When people move between different thermal environments, such as from indoors to outdoors, they experience short-term physiological changes like shifts in skin temperature and sweat rate. These changes are part of the body’s adaptation process and can affect thermal comfort for several minutes after the transition, with adaptation beginning around five minutes after exposure .
Short-Term Weight Loss in Athletes: Hormonal and Neural Changes
Athletes undergoing rapid weight loss (more than 5% of body weight) experience not only reductions in body and fat mass but also significant changes in stress hormone levels and brain activity. These short-term physiological changes can negatively impact health and performance, highlighting the risks of excessive rapid weight loss .
Electrical Stimulation: Auditory System Responses
Short-term electrical stimulation of the auditory system in animal models causes minor changes in auditory response latency and amplitude, as well as changes in electrode impedance. These effects are generally reversible and do not cause lasting harm under controlled conditions, indicating the safety of short-term stimulation for research and therapeutic purposes .
Conclusion
Short-term physiological changes are rapid and often reversible responses to environmental or internal stressors. These changes can be observed across a wide range of organisms and systems, from dairy cows and plants to humans and microbes. Understanding these immediate responses is crucial for monitoring health, managing stress, and predicting longer-term outcomes in both natural and controlled environments.
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Most relevant research papers on this topic
Short-term physiological responses to moderate heat stress in grazing dairy cows in temperate climate.
Moderate heat stress in grazing dairy cows leads to short-term physiological changes, with milk cortisol and Na+ concentrations potentially useful for timely monitoring of heat stress in individual cows.
Short‐term changes in left ventricular dyssynchrony may lead to congestive heart failure
Inducing left ventricular dyssynchrony in frogs may lead to short-term changes in cardiac metabolism and mitochondrial dysfunction, potentially leading to structural rearrangements and long-term congestive heart failure.
Growth explains microbial carbon use efficiency across soils differing in land use and geology
Short-term temperature changes positively impact soil microbial carbon use efficiency, while high moisture levels decrease it, with consistent responses across different land use and geology.
Short-Term Pulse Rate Variability to Measure Changes in Emotion during Trier Social Stress Test
Negative emotions are related to changes in physiological properties during stress induction using the Trier Social Stress Test, with increased short-term pulse rate variability after main tasks.
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