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Jordan Weber Fitness Fitness, Health and Adapted Physical Activity Videos, Blogs and Education

Programming
23/02/2024

Programming

Nutrient Timing
21/02/2024

Nutrient Timing

The endocrine system also regulates physiological actions that manage eustress and distressEustress: positive, desirable...
17/02/2024

The endocrine system also regulates physiological actions that manage eustress and distress
Eustress: positive, desirable form of stress that influences physiological/psychological health; sources can include exercise or working towards obtainable goals within one’s occupation
Distress: negative form of stress that influences physiological/psychological health; can be caused by excessive stress or forms which fail to improve well-being, such as anxiety or lack of sleep

The endocrine system:Complex network of integrated organs that communicate directives to help regulate all other body sy...
17/02/2024

The endocrine system:
Complex network of integrated organs that communicate directives to help regulate all other body systems and maintain homeostasis
Impacts reproduction, growth, tissue maintenance/repair and energy metabolism
Major organs of the system are seen in the figure, some have greater roles that go outside of their endocrine-related functions such as the hypothalamus and pancreas
Hypothalamus: region of the forebrain that coordinates the autonomic nervous system and governs the endocrine system via the pituitary gland; it directs maintenance activities for homeostasis including hunger, thirst, body temperature regulation, sleep and emotional responses
Pancreas: gland that secretes digestive enzymes into the small intestines for macronutrient breakdown; also produces the hormones insulin and glucagon for blood glucose regulation
The endocrine system also regulates physiological actions that manage eustress and distress
Eustress: positive, desirable form of stress that influences physiological/psychological health; sources can include exercise or working towards obtainable goals within one’s occupation
Distress: negative form of stress that influences physiological/psychological health; can be caused by excessive stress or forms which fail to improve well-being, such as anxiety or lack of sleep

Endocrine System
17/02/2024

Endocrine System

Stages of development
17/02/2024

Stages of development

Mechanisms that regulate blood flow to working muscles:Central nervous system via adjustments in mean blood pressure and...
16/02/2024

Mechanisms that regulate blood flow to working muscles:
Central nervous system via adjustments in mean blood pressure and shunting of flow from one area to another
Hormonal communication between tissues that impacts blood flow characteristics (dilation, constriction)
Increased capillary activity in muscles that need the most oxygen

Circulation for the heart:
The heart’s oxygen demand increases during exercise, requiring coronary blood flow to increase as the workload increases
To estimate the oxygen demands placed upon the heart during a given activity, systolic blood pressure is multiplied by heart rate to give a rate pressure product value
Rate pressure product (RPP): estimate of myocardial oxygen demand and efficiency as well as cardiovascular disease risk; low fitness or cardiovascular compromise increase the value
Values over 11,000 are considered high risk

Blood pressure: measure of force exerted by circulating blood against arterial walls; it is modulated in response to act...
16/02/2024

Blood pressure: measure of force exerted by circulating blood against arterial walls; it is modulated in response to activity, nutrition, body size, and health status
Diastolic blood pressure and systolic blood pressure are measured during diastole and systole of the heart
Blood pressure = cardiac output x total peripheral resistance
Major factors that impact total peripheral resistance include body size, obesity, nutrition, and vessel disease

Blood pressure is managed via baroreceptors located in major arteries which can promote dilation or constriction
Baroreceptors: specialized receptors in the large arteries that detect changes in pressure and inform the central nervous system to decrease/increase blood pressure or heart rate
During exercise or high-stress situations:
Heart rate increases → which increases cardiac output → which increases blood pressure
Aerobic exercise increases mean arterial pressure much less than weightlifting; especially when using the Valsalva maneuver
Valsalva maneuver: attempting to move a heavy load while holding one’s breath; it is contraindicated for those with hypertension
Hypertension: clinical diagnosis of high blood pressure that has a negative impact on cardiovascular function and causes vascular damage over time

As detailed earlier, cardiac output is the total volume of blood available for use by all bodily tissues as dictated by ...
16/02/2024

As detailed earlier, cardiac output is the total volume of blood available for use by all bodily tissues as dictated by heart rate and stroke volume
Males tend to have higher CO and VO2max due to larger heart sizes and more muscle mass
Endurance training can improve cardiac output by improving the heart’s capacity to pump blood to working tissues via:
Increased ventricular mass and strength
An increased volume of blood expelled per heart beat
Key concept: if each heart beat expels more oxygenated blood due to aerobic fitness improvements, the heart will not have to work as hard at rest or during submaximal work
Higher cardiac output = reduced resting and submaximal exercise heart rates - this explains why resting heart rate is a measure of cardiovascular fitness – as CRF goes up heart rate goes down reciprocally
Other adaptations include increased capillary/mitochondrial density for enhanced O2 extraction

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