EXSS2022 Lecture Notes - Lecture 4: Cardiorespiratory Fitness, Vo2 Max, Neutrophil
4 Sep 2018
School
Department
Course
Professor
Week 4 Notes
Lecture 1 Detraining
Detraining: marked decrease in training
- leads to loss of training induced adaptations
- insufficient training stimulus (may not be cease of training, just decreased)
Training Cessation: temporary discontinuation of a systematic program of conditioning
Taper: reduced training volume (4-28 days) prior to a major competition
- decrease stress
- complete recovery and adaptation = optimise performance
- decrease volume (up to 60%)but maintain intensity
- progressive taper rather than step
- may increase performance up to 3%
Detraining Syndrome: endurance athletes who suddenly stop regular activity may be unable to
adjust
- leads to many symptoms in the body
Maintenance Dose: decrease in training while continuing sufficient activity to maintain function
and performance
Detraining Factors:
Due To
- illness, injury, work, travel, vacation, social life (may be planned or unplanned)
- off season - varies from 3-5 weeks for elite athletes
Effects of Detraining:
- depends on length of inactivity, training background (trained or untrained)
Inactivity
- short term = under 4 weeks
- long term = over 4 weeks
Short Term Effects:
- rapid decrease in VO2max - initial rapid decrease due to decreased blood volume (<2 days)
- decreased stroke volume/cardiac output (Q)
- compensatory increase in heart rate - does not counterbalance reduced SV and CO
- decreased cardiorespiratory fitness (lower peak and sustainable work rate)
- increased reliance on carbohydrates as energy source (higher RER)
- decreased lipid metabolism
- decreased whole body glucose uptake
- decreased capillary density
- decreased in oxidative enzyme activities (ATP production) - via loss of mitochondria
- left shift in lactate threshold (higher lactate threshold at lower intensity)
- no change in fibre type distribution
- small decrease in cross sectional area in short term
Document Summary
Leads to loss of training induced adaptations. Insufficient training stimulus (may not be cease of training, just decreased) Training cessation: temporary discontinuation of a systematic program of conditioning. Taper: reduced training volume (4-28 days) prior to a major competition. Complete recovery and adaptation = optimise performance. Decrease volume (up to 60%)but maintain intensity. Detraining syndrome: endurance athletes who suddenly stop regular activity may be unable to adjust. Leads to many symptoms in the body. Maintenance dose: decrease in training while continuing sufficient activity to maintain function and performance. Illness, injury, work, travel, vacation, social life (may be planned or unplanned) Off season - varies from 3-5 weeks for elite athletes. Depends on length of inactivity, training background (trained or untrained) Rapid decrease in vo2max - initial rapid decrease due to decreased blood volume (<2 days) Compensatory increase in heart rate - does not counterbalance reduced sv and co. Decreased cardiorespiratory fitness (lower peak and sustainable work rate)
