| Date | May 2019 | Marks available | 1 | Reference code | 19M.3.SL.tz0.1 |
| Level | Standard Level | Paper | Paper 3 | Time zone | time zone 0 |
| Command term | Identify | Question number | 1 | Adapted from | N/A |
Question
Swimmers may wait for up to 30 minutes (transition time) between warming up in the pool and competing in a race. A study compared four conditions for swimmers during the transition time:
- Condition 1: control (sitting and wearing a tracksuit)
- Condition 2: sitting and wearing a heated jacket
- Condition 3: continuing warm-up on land
- Condition 4: continuing warm-up on land and wearing a heated jacket.
The three graphs show the results of the different conditions on 100 m and 15 m swim times and change in core body temperature.
100 m swim time relative to control
15 m swim time relative to control
Mean change in core body temperature during the 30-minute transition time
Identify the condition that showed the least improvement in 100 m swim time in comparison to the control.
Calculate the difference in the mean change in core body temperature, in °C, between conditions 1 and 2.
Using the data from this study, deduce which warm-up condition a competitive swimmer should use to maximise their performance.
Markscheme
Condition 2/sitting and wearing heated jacket ✔
[1]
–0.6 – –0.45 ✔
= –0.15 «°C»
OR
= 0.15 «°C» ✔
Accept in the converse
Accept ±0.02 for the second mark
[2]
Condition 4/combination of heated jacket and warm-up on land would be the best approach ✔
the core temperature reduced by the least «0.1 °C» ✔
the 100 m sprint time showed the greatest improvement compared to the control «−1%» ✔
the time to 15 m showed the greatest improvement compared to the control «−0.4%» ✔
[3 max]
Examiners report
In general students were able to obtain most of the marks for these questions. Parts (a) and (b) were done particularly well and very few students struggled with these questions.
In general students were able to obtain most of the marks for these questions. Parts (a) and (b) were done particularly well and very few students struggled with these questions.
In general students were able to obtain most of the marks for these questions. On part (c) of the question many of the students correctly referred to the data in response to the question.
