Table 2.

Relationships between internal and external measures of load (Pearson’s product correlation coefficients: r).

	Total Distance	Work to Rest Ratio	Low-Intensity Distance	High-Intensity Distance	Max Speed	# of Sprints	Average Speed
Polar HR load (a.u)	0.66 *	−0.34 *	0.66 *	0.38 *	0.21 *	0.31 *	0.11 *
Zone 1: 0–60% HR max	0.40 *	0.26 *	0.41 *	0.22 *	0.13 *	0.20 *	−0.10 *
Zone 2: 60–70% HR max	0.48 *	−0.18 *	0.51 *	0.18 *	0.05	0.12 *	0.04
Zone 3: 70–80% HR max	0.45 *	−0.28 *	0.45 *	0.24 *	0.06	0.18 *	0.12 *
Zone 4: 80–90% HR max	0.19 *	−0.15 *	0.20 *	0.09 *	0.03	0.08	0.14 *
Zone 5: 90–95% HR max	0.07	−0.01	0.05	0.08 *	0.11 *	0.15 *	0.11 *
Total HR Exertion	0.74 *	−0.08	0.77 *	0.34 *	0.13 *	0.27 *	0.01
Average HR (bpm)	0.32 *	−0.40 *	0.35 *	0.08	−0.04	0.01	0.09 *
Max HR (bpm)	0.14 *	−0.09 *	0.14 *	0.11 *	0.01	0.06	0.04
Min HR(bpm)	0.04	−0.08	0.05	0.01	−0.03	−0.02	−0.03
% HR Reserve (a.u.)	0.21 *	−0.29 *	0.24 *	0.02	−0.02	0.01	0.12 *
TRIMP (a.u.)	0.55 *	−0.18 *	0.58 *	0.19 *	0.07	0.15 *	0.09 *
eEE (kcals)	0.69 *	−0.19 *	0.73 *	0.27 *	0.08	0.19 *	0.02
Polar Recovery	0.31 *	−0.16 *	0.35 *	0.04	−0.04	−0.02	0.05
sRPE (borg 0–10)	−0.21 *	−0.22 *	−0.18 *	−0.11 *	0.11 *	−0.02	0.04
sRPE-TL (a.u.)	0.89 *	0.18 *	0.91 *	0.69 *	0.45 *	0.72 *	0.22 *

* denote significant r values (p < 0.05), Bold indicates moderate to strong Correlation (r > 0.5). Time spent in each HR zone (min), Distance (m), Work to Rest Ratio (a.u.), High-intensity running (18–20 km·h⁻¹), Sprinting (>20 km·h⁻¹), Low Intensity Distance: 0–14 km·h⁻¹ (m), High Intensity Distance: >14 km·h⁻¹ (m), # of Sprints (>20 km·h⁻¹), Speed (km·h⁻¹), eEE = Estimated Energy Expenditure, a.u. = arbitrary units, sRPE= session rating of perceived exertion, sRPE-TL = session rating of perceived exertion training load, bpm = beats per min.