Exercise Physiology
CHR-test
Clamped Heart Rate test
CHR-test
is an functional test of cardiovascular system
based on the principle of feedback control of
exercise intensity by hear rate
Clamped HR = fixed in set range (±4)
168
160
CHR-test
Devices:
- bicycle ergometer connected to PC
- hear rate monitor connected to PC
Feedback control of exercise intensity by heart rate
168
160
load
CHR-test
Target HR (HRt)
optimal exercise intensity
closely below anaerobic threshold
anaerobic threshold (AnP)
1] by measurement (lab or field tests)
2] calculated from VO2max
- VO2max can be measured, calculated by regression’s
equations or guessed
CHR-test
AnT calculation from VO2max (ml/kg/min)
AnT = VO2max/3,5 + 60
AnT = 35/3,5 + 60
AnT = 70 %VO2max
1 MET
60 % of VO2max - AT
CHR-test
AnT calculation from VO2max
AnT = VO2max/3,5 + 60
AnT = 35/3,5 + 60
AnT = 70 %VO2max
% MHRR = % VO2max
CHR-test
MHRR = maximal heart rate reserve
Karvonen et al. (1957):
MHRR = HRmax – HRrest
TFmax 200
MHRR = 130 beat/min
161
70 % MHRR = 130 × 0,7 = 91
TFklid
70
91 + 70 = 161
CHR-test
MHRR = maximal heart rate reserve
Karvonen et al. (1957):
MHRR = HRmax – HRrest
MHRR
CHR-test
MHRR = maximal heart rate reserve
Karvonen et al. (1957):
MHRR = HRmax – HRrest
% VO2max = % MHRR
for example:
70 % VO2max = 70 % MHRR
CHR-test
Target HR (HRt)
HRt =
VO2max/kg
350
+ 0.6 × HRmax – HRrest + HRrest
for example: average man, 20-year
HRt =
45 ml/kg/min
+ 0.6 × 200 –
350
HRt = 165 ± 4
70
+ 70
CHR-test
1] HRt = 165 ± 4
2] duration = 30 minutes (without warming up)
3] initial load
Wi = k × weight [kg]
values of k:
male
female
trained
2.5 W
1.8 W
sedentary
2.0 W
1.3 W
CHR-test
1] HRt = 165 ± 4
2] duration = 30 minutes (without warming up)
3] initial load
Wi = k × weight [kg]
beginning of test – 50% of Wi
after 30 seconds – 75% of Wi
after 60 seconds – 100% of Wi
than 5 W every 30 s till HRt is reached
warm up
3 – 6 min
After reaching HRt own test starts – 30 minutes
Values:
1) W1 - load et the beginning of test
2) Wx - average load during test
3) N - number of changes of load
[W] [HR]
[HRt±4]
[W1]
[Wi 100%]
[Wi 75%]
[Wi 50%]
3.5 min
30 min
Warm up
test
Values:
1) W1 - load et the beginning of test
2) Wx - average load during test
3) N - number of changes of load
Evaluated parameters of CHR test:
1) Efficiency of cardiovascular system during short term exercise
(EDSE) – speed ability
based on W1
2) Efficiency of cardiovascular system during long term exercise
(EDLE) – endurance ability
based on Wx
Values:
1) W1 - load et the beginning of test
2) Wx - average load during test
3) N - number of changes of load
Evaluated parameters of CHR test:
3) Stability of reaction of cardiovascular system on load
(SOL) – familiarity with the exercise intensity
based on N
3) Complex index (CI) – associated parameter 1, 2 and 3
Evaluated parameters of CHR test:
each parameter is by use of knowing norm conversed
on point scale
-5
very poor
0
average
+5
excellent
CHR-test enables:
1] evaluation of cardiovascular system...
2] prescription of exercise program
CHR-test is one training unit controlled in laboratory. On the
basis of that the recommendation of optimal exercise
intensity (optimal HR) is done.
Exercise program:
-3.5/week
-30-45 minutes
-optimal HR (range ±5)