Table 6 Correlation analysis between energy expenditure, body composition, and fatigue at T0

Parameter

mREE

mREE/FFM

mREE/pREE

General fatigue

Physical fatigue

Decreased activity

Decreased motivation

Mental fatigue

BW

0.524*

 − 0.125

 − 0.135

0.187

0.285

0.102

0.136

0.115

FFM_kg

0.455*

 − 0.509*

 − 0.083

0.181

0.304

0.465*

0.338

0.026

FFM_%

 − 0.177

 − 0.367

0.103

 − 0.071

 − 0.110

0.325

0.197

 − 0.146

FM_kg

0.430

0.176

 − 0.065

0.025

0.129

 − 0.252

 − 0.096

0.062

FM_%

0.177

0.367

 − 0.103

0.071

0.110

 − 0.325

 − 0.197

0.146

mREE

1

0.530*

0.710*

 − 0.134

0.103

 − 0.158

0.068

 − 0.093

mREE/FFM

0.530*

1

0.779*

 − 0.283

 − 0.173

 − 0.576*

 − 0.269

 − 0.115

mREE/pREE

0.710*

0.799*

1

 − 0.341

 − 0.146

 − 0.350

 − 0.082

 − 0.270

Correlation analysis between energy expenditure, body composition, and fatigue at T1

Parameter

mREE

mREE/FFM

mREE/pREE

General fatigue

Physical fatigue

Decreased activity

Decreased motivation

Mental fatigue

BW

0.832*

0.582*

0.641*

 − 0.208

 − 0.176

 − 0.103

 − 0.428

0.065

FFM_kg

0.523

 − 0.034

0.267

 − 0.221

 − 0.058

0.011

 − 0.069

 − 0.067

FFM_%

 − 0.417

 − 0.748*

 − 0.541*

 − 0.110

0.118

0.234

0.521

 − 0.068

FM_kg

0.765*

0.805*

0.754*

 − 0.017

 − 0.165

 − 0.249

 − 0.608*

0.010

FM_%

0.218

0.212

0.233

0.252

0.066

0.548*

 − 0.287

0.163

mREE

1

0.832*

0.922*

 − 0.300

 − 0.348

 − 0.248

 − 0.414

 − 0.217

mREE/FFM

0.832*

1

0.905*

 − 0.200

 − 0.356

 − 0.268

 − 0.431

 − 0.178

mREE/pREE

0.922*

0.905*

1

 − 0.212

 − 0.275

 − 0.261

 − 0.270

 − 0.287