| Date | November 2018 | Marks available | 1 | Reference code | 18N.3.SL.tz0.1 |
| Level | Standard Level | Paper | Paper 3 | Time zone | time zone 0 |
| Command term | State | Question number | 1 | Adapted from | N/A |
Question
A study compared the effects of two recovery techniques on quadriceps muscle mass over a 12-week strength training programme. Twenty-one participants were randomly assigned to one of two groups:
• Active recovery (ACT) 
• Cold water immersion (CWI) 
.
The CWI group laid in cold water for 10 minutes immediately after exercise, whereas the ACT group rode for 10 minutes at low intensity on an exercise bike. The results are shown in the graph.
[Source: Republished with permission of BLACKWELL PUBLISHING LTD. from Roberts, L. A., et al. 2015. Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training.The Journal of physiology, 593: 4285-4301. doi:10.1113/JP270570; permission conveyed through Copyright Clearance Center, Inc.]
State the mean muscle mass of the active recovery (ACT) group post-training programme.
Calculate the difference in mean muscle mass for the active recovery (ACT) group pre-training and post-training programme.
Using the data, deduce the relative effectiveness of the recovery techniques.
Markscheme
3200 «g» ✔
3200−2800 ✔
= 400 «g» ✔
Accept the subtraction in a different order.
CWI did not affect muscle mass ✔
ACT helped in the development of muscle mass ✔
CWI is «significantly» less effective than ACT in developing muscle mass ✔
Accept in the converse.
Examiners report
No issues.
No issues.
No issues.
