Two or more data sets from different subjects

Data from two exercise regimes in two different groups

Data from the same subject at different time intervals

Data for one variable from different subjects

Statistical hypothesis     

Simple hypothesis      

Composite hypothesis     

Alternative hypothesis  

Toxins

Infection

Aging

Low pH

Subtendons have no effect on force distribution within the tendon.

Subtendons directly generate muscular force.

Subtendons exist solely in positional tendons, not in energy storage tendons.

Subtendons enable twisting and differential movement, which helps decouple muscle-tendon units and may influence the risk of pathology if shear forces are mismanaged.

Tendons have a traditionally low blood supply that increases dramatically with activity; most nerve endings and autonomic nerve fibres are located in the outer tendon regions.

Tendons have abundant fibrocartilage throughout and are innervated only by Group Ia afferent fibers.

Tendons are devoid of any nerve endings and rely entirely on muscle blood flow for nourishment.

Tendons have extensive blood supply throughout, especially at compression sites, and contain only mechanoreceptors in their inner core.

Myoblasts

Sarcomeres

Satellite cells

Fibroblasts

Muscle contraction

Diffusion of oxygen into the blood

Maintenance of ion gradients

Protein synthesis

42km marathon

1500 m run 

100 m sprint

5 mile walk 

The expansion of muscle fibres

A reduction in muscle mass

An increase in muscle force

An increase in muscle mass

It leads to friction between solid and fluid phases, enabling stress relaxation and creep.

It ensures tendons never change in volume or length.

It eliminates the need for proteoglycans in the tendon matrix.

It increases tendon stiffness permanently after each stretch.