Table 6. Intraclass Correlation Coefficients. 3 weeks 3 years 40-60 y 20-40 y youth sample A B A B A B A B A B N 32-34 15-16 29-33 14-15 14-15 0 29-31 14 30-33 15 end low I .81†  .55+ .82†  .23 .78†  - .65†  .62 .60†  .55 end medium I .61†  .38 .60†  .38 .93†  - .67†  .62 .64†  .80†  end high I .86†  .86†  .80†  .87†  .92†  - .76†  .82†  .84†  .89†  speed/strength .93†  .74†  .72†  .81†  .96†  - .84†  .77†  .81†  .86†  transport .88†  .87†  .88†  .81†  .79†  - .78†  .93†  .78†  .94†  * p < 0.05 †  p < 0.01. end: endurance; I: intensity; N: sample size; sample A: healthy population; sample B: physical education students, y: years.