Human locomotion and heat loss: an evolutionary perspective
1Department of Human Evolutionary Biology, Harvard University, 11 Divinity Avenue, Cambridge, MA 02138, USA.
Comprehensive Physiology
|January 16, 2015
Summary
Human evolution favored furless, bipedal locomotion and efficient heat loss for endurance activities like foraging and persistence hunting in hot climates. These adaptations support long-distance movement over speed, crucial for survival and dispersal.
Area of Science:
- Human evolution
- Paleoanthropology
- Thermoregulation
Background:
- Humans are unique furless, bipedal mammals adapted for endurance locomotion and heat dissipation.
- Early hominin evolution is linked to bipedalism for efficient foraging.
Purpose of the Study:
- To review the evolutionary origins of human bipedalism, furlessness, and thermoregulation.
- To explore the relationship between these traits and human endurance capabilities.
Main Methods:
- Literature review of paleoanthropological and evolutionary studies.
- Synthesis of current knowledge on hominin evolution and adaptation.
Main Results:
- Bipedalism likely evolved for efficient foraging, while heat-loss mechanisms (sweating) evolved for endurance activities like persistence hunting.
- Modern humans are adapted for long-distance locomotion and heat dissipation, not speed or heat retention.
Conclusions:
- Human evolution prioritized endurance and thermoregulation for survival in diverse environments.
- Ongoing selection continues to shape human populations' adaptations to locomotor and thermoregulatory challenges.
Related Concept Videos
01:25Body Temperature
5.5K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
5.5K
01:07Body Temperature
1.9K
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
1.9K
01:14Mechanisms of Heat Transfer
2.2K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
2.2K
01:19Mechanism of heat transfer
2.3K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.3K
01:26Thermoregulation
3.4K
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
3.4K
01:26Requirements for Human Life
14.8K
The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
14.8K