Reliability of a 60-min treadmill running protocol in the heat: The journal Temperature toolbox

Figures & data

Figure 1. Experimental overview (left) and protocol (right).

Figure 2. Core temperature (T_core) response during the protocol for the second and third trials. Values are mean ± SD.

Figure 3. Bland-Altman plot displaying individual time-trial results. Solid black line denotes bias, whilst dashed black lines denote 95% limits of agreement.

Table 1. Individual performances of distance completed (km) during the 15-min time-trial.

Participant	Trial 1	Trial 2	Trial 3
1	3.06	3.15	3.26
2	2.82	2.76	2.88
3	2.86	3.18	2.89
4	2.73	3.08	3.10
5	3.17	3.01	2.89
6	2.46	2.80	2.80
7	2.68	2.90	2.93
8	3.15	3.11	3.17
9	2.68	2.87	2.93
Mean ± SD	2.84 ± 0.24	2.98 ± 0.16*	2.98 ± 0.16*

*Significantly different to Trial 1 (p < 0.05).

Table 2. Mean ± SD measures between the second and third trials for distance completed during 15-min self-paced time-trials, measures of core temperature (T_core), heart rate (HR), rate of O₂ consumption (VO₂) and whole-body sweat rate (WBSR), including mean difference (bias), standard error of measurement (SEM) and intraclass correlation coefficient (ICC). * significant at p < 0.05 following analysis of variance.

	Trial 2	Trial 3	Bias ± SD	SEM	ICC
Time-Trial Distance (km)	2.984 ± 0.156	2.983 ± 0.155	0.001 ± 0.129	0.037	0.81*
Baseline Tcore (°C)	36.96 ± 0.21	36.74 ± 0.42	−0.23 ± 0.46	0.22	0.03
45 min Tcore (°C)	39.04 ± 0.24	38.71.±0.55	0.32 ± 0.57	0.28	0.15
0–45 min ΔTcore (°C)	2.07 ± 0.20	1.98 ± 0.29	−0.10 ± 0.22	0.13	0.75*
0–45 min HR (beats·min^−1)	168 ± 8	163 ± 12	4 ± 10	3	0.72*
0–45 min VO2 (L·min^−1)	3.614 ± 0.319	3.548 ± 0.310	0.066 ± 0.114	0.012	0.96*
0–60 min WBSR (L)	1.308 ± 0.198	1.301 ± 0.158	0.006 ± 0.138	0.038	0.81*

Figure 4. Bland-Altman plots displaying the individual T_core at baseline (upper), T_core at the end (45 min) of the fixed-intensity preload (middle) and change in T_core during the 45 min fixed-intensity protocol (lower). Solid black line denotes bias, whilst dashed black lines denote 95% limits of agreement.

Table

CV	Coefficient of variation
HR	Heart rate
ICC	Intraclass correlation coefficient
LoA	Limits of agreement
SEM	Standard error of measurement
Tcore	Core temperature
VO2	Rate of O2 consumption
VO2max	Maximal rate of O2 consumption
VT1	Ventilatory threshold