anerobic threshold Flashcards
Define anaerobic threshold?
The intensity of exercise
above which
measurement of oxygen
uptake cannot account for
all of the required energy.
highest steady-state oxygen
uptake
what is an anaerobic threshold? also known as lactate threshold
Determinant or indicator of endurance performance.
It is the exercise intensity at which the body’s demand for oxygen exceeds its supply, leading to a shift from aerobic energy production to anaerobic energy production.
As exercise intensity increases, the body’s demand for oxygen also rises reaches a point where the body cannot supply sufficient oxygen to meet the muscles’ energy needs, leading to an increased reliance on anaerobic metabolism.
At the anaerobic threshold, the body starts producing energy predominantly through anaerobic processes, leading to an accumulation of lactate and other byproducts in the muscles and bloodstream. This increase in lactate is often associated with muscle fatigue, and it acts as an indicator of the body’s transition to higher-intensity exercise
factors that affect vo2?
age- decreases by 10%/year
vo2 and exercise why is important?
Enables the aerobic capacity for cardiovascular work
highest vo2 recorded for males and females
male 95 min female 84vl/min
when at a plateau at vo2?
> 100 ml/min
what effects threshold?
how is max effort reached? 100%
As power increases plateau vo2 is reached when there is no change
running speed at which cannot be maintained 260m/min
what effects steady state?
Individuals possess many steady-rate
levels during exercise depending on
training level
* Two factors help to explain athletes’ high
steady-rate levels:
1. High capacity of the central circulation to
deliver oxygen to working muscles
2. High capacity of the active muscles to use
available oxygen
define Steady state
steady-state cardio refers to a type of aerobic exercise where a person maintains a consistent, moderate level of intensity for a relatively extended period. T
how is the anaerobic threshold measured?
lactate measuring, ventilatory threshold,
how does obla relate to anerobic threshold?
label anaerobic threshold graph, know where each component is
components of anerobic threshold
Maximal lactate steady state (MLSS)
* Ventilatory threshold
– VT, or VT2
* Lactate threshold (LT)
– LT or LT2
* Onset of blood lactate accumulation (OBLA; OBLA
4mM)
* Respiratory Compensation Point or Threshold (RCP
or RCT)
* Critical Power (CP) or Critical Speed (CS
define vE
Ventilatory Threshold 2
* VT describes a point at which pulmonary
ventilation increases disproportionately with VO2
* The “excess” ventilation results directly from CO2
increased output from buffering of the lactate that
begins to accumulate from increased anaerobic
glycolysis
lactate+ NaHCO3 Na Lactate + H2CO3
H2O + CO2
what is the relationship between VE and co2 and v02?
Relationship between
various ventilatory
measures and blood
lactate concentration
VE / VCO2 and VE / VO2 are
ventilatory equivalents
lactate vs power graph
many methods of looking at threshold
know which one
what limits Limitations to VO2max/
limited by the delivary and uptake
more specifically what limits v02
know diagram
pulmonary diffusion capabilities
cardiac output
02 carrying capacity e.g blood doping
amount of skeletal muscle
differences and links between Q- cardiac output and V02
comparisons
