What is Vo2 Max or maximal oxygen consumption, maximal oxygen uptake, aerobic capacity?

Vo2Max determines the cardiovacular fitness of an individual. it is the volume of oxygen used by the muscles for contraction in a unit of time.
The muscles need energy for contraction, with the help of oxygen and few other elements energy(ATP) is created. This energy feuls muscle contraction. in short, the better the supply of oxygen to the muscle longer will the activity last.
Oxygen reaches the body via the Lungs, the lungs pass it on to the blood and the heart pumps it all around the body.
Oxygen is supplied to the muscle by blood vessels, the muscles extract the oxygen from the blood vessels and use it to create energy needed for muscular movement.

This phenomenon of providing and extracting oxygen to the muscle is the Vo2max = V - volume per time, O2 - oxygen, max - maximum.

It is essential for any athlete to have a high Vo2Max, whatever the sport. The Vo2Max is a indirect indicator of the individuals overall health. It is a standard for measuring physical fitness.
In endurance sports the greater the Vo2Max the longer and faster the sportsperson will perform.
In strength sports if the individual has a high Vo2Max then the formation of harmful chemicals or metabolites(lactic acid) is minimal and the sportsperson can maintain a set for longer duration for max strength gains.

High Protein diets and calcium

Precautions while on a high protein diet.

• Protein, water and calcium: When on a high protein diet, take care of the water input as high protein diet is known to cause increase concentration of calcium in urine. 
• Habitual excess protein intake is a significant risk factor for calcium loss via the kidneys. Calcium excretion also accompanied with daily urinary excretion of urea. The calcium excretion with animal protein intake was found to be significantly positive in both sexes and in each age group whereas that with plant protein was not. Findings suggest that regular use of excess protein in diets may augment calcium excretion in the urine, at least in the elderly.
• Sports persons especially bodybuilders control their water input when they are near the competition date, and they increase their protein intake at the same time, this may lead to excess excretion of calcium.
• Plenty of water, regular physical activity (30 minutes walking, more than 5 days a week) and monitoring kidney profile should prevent any adverse effects.

BIO MECHANISM OF A SLIPPED DISK

The vertebral column is made up of thick cubical bones which are mounted on top of one another to form a tall structure eg., bricks mounted on top of each other.

the vertebral coloumn bones stacked up one on top of the other!

In between these bricks lies the soft cushion known as the inter vertebral disc.
A soft rubber like cushion is situated between the bricks or bones

An intervertebral disc is made up of a rubber like material, it has a central pulp(nucleus pulposus) surrounded by circular fibrous tissue called annulus fibrosus. shown below fig 1 fig 2 and fig 3

fig 1 fig 2

The function of the disc is to act as a shock absorber and joint between the two vertebral bones , as the person jumps, runs walks or lifts weight the disks absorb the shocks, also when we twist the waist. the disks acting as the joint around which the bones pivot.

The disk prevents the vertebral bodies from coming in contact with each other.

On top of the vertebral column lies the persons head and below, the vertebral column rests on the sacrum. The weight of the head causes the vertebral column to be compressed between the head and the sacrum. as we walk or run the forces generated travel up via the ankle joint, knee joint, hip joint and reach the sacrum bone, from here the forces collide against the vertebral coloumn(lumbar vertebrae)

fig 3

These forces can cause damage to the body and they need to be dampened.

To prevent compression and friction between the vertebrae the 'shock absorber disk' comes into action.

As the person jumps vertebrae, one on top of the other are pressed against each other, the pressure within the central pulp rises and the pulp tries to push out against the annulus fibrosus fig 4, The annulus counters this by tensing around the pulp! This mechanism contains the pulposus within the annulus! and prevents the pulposus from extruding out of the annulus and the vertebrae from coming in contact with each other.

fig4 fig 5 fig 6
If (1) the pressure built up within the annulus is too great or (2) if the annulus has hardened due to degeneration or simply dried up(dessicated) or (3) if the vertebral column is twisted in an abnormal fashion or pulled violently by the ligaments and muscles attached to it, then the annulus bulges out fig 6 or it gives way and the pulp finds its way outside called extrusion fig 7,8,9, resulting in failure of the shock absorber mechanism and giving rise to the phenomenon known as the slipped disk.

When the pulposus bulges into the spinal canal or the pulp breaks out of the annulus and enters the vertebral canal to come in contact and compress the spinal cord it is known as herniation/ prolapse of an inter vertebral disc.

extrusion of the pulposus fig 7,,8,9.