| AEROBIC |
Energy created with oxygen, or in the presence of oxygen. |
| ANAEROBIC |
Energy created without oxygen, or in the absence of oxygen. |
| ENDURANCE-STRENGTH |
The ability of a muscle to produce prolonged effort. |
| FAST-SLOW-TWITCH FIBER |
A striped type of muscle fiber that exhibits both slow fatigue and quick fatigue characteristics depending on the demands placed upon it. |
| FAST-TWITCH FIBER |
One of the two major types of muscle fiber that contracts and fatigues quickly and relies mainly on anaerobic energy. |
| FATIGUE |
A generalized or specific feeling of tiredness that may have a multitude of causes both mental and physical. |
| HYPERTROPHY |
An increase in the overall size of a tissue. |
| POWER-STRENGTH |
The amount of work accomplished by a muscle relative to the duration of the effort (work divided by time). |
| SKELETAL MUSCLE |
The most prevalent type of muscle in the body; usually anchored to bone to carry out voluntary movement. |
| SLOW-TWITCH FIBER |
One of the two major types of skeletal muscle fiber; it contracts and fatigues slowly and relies mainly on aerobic energy. |
| STROKE VOLUME |
The amount of blood ejected by a ventricle of the heart with one beat. |
| TESTOSTERONE |
Male growth hormone responsible for muscle growth and masculine characteristics (facial hair, deep voice, aggressiveness, ect.). |
IMPORTANT BIOFITNESS WORD DEFINITIONS