Sports Coach Blog
Website UpdatesPWC-170 Cycle Test
Testing and measurement are the means of collecting information upon which subsequent performance evaluations and decisions are made but in the analysis we need to bear in mind the factors that may influence the results.
Objective
The primary purpose of the PWC170 test (Cambell et al. 2001)[1] is to predict the power output (watts) at a projected heart rate of 170 beats per minute (bpm).
Required Resources
To undertake this test you will require:
- Bicycle ergometer
- Heart rate monitor
- Stopwatch
- Assistant
How to conduct the test
This test requires the athlete to cycle for 6 minutes whilst maintaining their heart rate between 120-140bpm and the following a 10 minute rest cycle for another 6 minutes whilst maintaining their heart rate between 150-170bpm.
- The athlete warms up for 10 minutes
- The athlete starts cycling
- The assistant adjusts load on the bicycle ergometer to raise the athlete’s heart rate to between 120-140bpm
- The assistant resets the power output to zero and starts the stopwatch
- After 6 minutes the assistant records the power output (P1) and the athlete’s average heart rate (H1)
- The athlete rests for 10 minutes
- The athlete starts cycling
- The assistant adjusts load on the bicycle ergometer to raise the athlete’s heart rate to between 150-170bpm
- The assistant resets the power output to zero and starts the stopwatch
- After 6 minutes the assistant records the power output (P2) and the athlete’s average heart rate (H2)
The mathematical approach to determining the power output at 170 bpm is the Polynomial Approximation method.
Power output = (((P1 × H2) - (P2 × H1)) ÷ (H2 - H1)) + (170 × ((P1 - P2) ÷ (H1 - H2)))
Example
An athlete produces the following test results:
- Session 1 - average heart rate of 130 bpm (H1) and a power output of 100 watts (P1))
- Session 2 - average heart rate of 153 bpm (H2) and a power output of 150 watts (P2)
Power output = (((100 × 153) - (150 × 130)) ÷ (153-130)) + (170 × ((100-150) ÷ (130-153))
Power output = ((15300 - 19500) ÷ 23) + (170 × (-50 ÷ -23))
Power output = -182.61 + 369.57
Power at 170bpm = 186.96 watts
Analysis
Analysis of the test result is by comparing it with the athlete's previous results for this test. It is expected that, with appropriate training between each test, the analysis would indicate an improvement in the athlete's projected heart rate of 170 beats per minute (bpm).
Target Group
This test is suitable for sprint cyclists and sprinters but not for individuals where the test would be contraindicated.
Reliability
Test reliability refers to the degree to which a test is consistent and stable in measuring what it is intended to measure. Reliability will depend upon how strict the test is conducted and the individual's level of motivation to perform the test. The following link provides a variety of factors that may influence the results and therefore the test reliability.
Validity
Test validity refers to the degree to which the test actually measures what it claims to measure and the extent to which inferences, conclusions, and decisions made on the basis of test scores are appropriate and meaningful. This test provides a means to monitor the effect of training on the athlete's physical development.
Advantages
- Minimal equipment required
- Simple to set up and conduct
Disadvantages
- Specialist equipment required
- Assistant required to administer the test
Free Calculator
- PWC-170 - a free Microsoft Excel spreadsheet that you can download and use on your computer.
Referenced Material
- CAMBELL, P.T. et al. (2001) Prediction of physical activity and physical work capacity (PWC 170) in young adulthood from childhood and adolescence with consideration of parental measures. Am J Human Biol, 13, p. 190-196
Page Reference
The reference for this page is:
- MACKENZIE, B. (2002) PWC-170 Cycle Test [WWW] Available from: http://www.brianmac.co.uk/pwc170.htm [Accessed
Associated Pages
The following Sports Coach pages should be read in conjunction with this page:
 |
 |