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Table 7 Output from linear mixed effects models predicting performance variables

From: A quasi-experimental examination of weight-reducing dehydration practices in collegiate male rowers

Predictors

Model 1

Model 2

LRT

SE

b (CI)

p

SE

b (CI)

p

LR

p

Peak power (W)

      

4.8

0.091

 (Intercept)

21.32

682.67 (639.82 – 725.53)

 < .001

21.28

677.31 (635.58 – 719.04)

 < .001

  

 Total

2.33

2.7 (-1.99 – 7.38)

.259

     

 Thermal

   

3.62

-3.4 (-10.50 – 3.70)

.358

  

 Abstinence

   

5.19

12.14 (1.96 – 22.31)*

.029

  

 Thermal*Abstinence

   

6.49

8.59 (-4.14 – 21.32)

.200

  

Total Watts (W)

      

9.37

0.009

 (Intercept)

4720.3

72,882.53 (63,393.04 – 82,372.02)

 < .001

4634.09

70,764.81 (61,678.85 – 79,850.77)

 < .001

  

 Total

690.7

534.82 (-853.74 – 1923.38)

.447

     

 Thermal

   

981.14

-1874.35 (-3798.05 – 49.35)

.070

  

 Abstinence

   

1407.08

4261.51 (1502.68 – 7020.34)

.006

  

 Thermal*Abstinence

   

1756.81

3412.85 (-31.69 – 6857.39)

.066

  

Max VO2/kg (L/min)

      

1.63

0.444

 (Intercept)

1.49

55.23 (52.23 – 58.24)

 < .001

1.57

55.01 (51.93 – 58.09)

 < .001

  

 Total

0.25

-0.28 (-0.79 – 0.23)

.273

     

 Thermal

   

0.41

-0.05 (-0.85 – 0.75)

.906

  

 Abstinence

   

0.58

-0.5 (-1.64 – 0.65)

.404

  

 Thermal*Abstinence

   

0.73

-0.19 (-1.62 – 1.24)

.796

  

VO2 at 2 mmol/L (L/min)

     

1.19

0.551

 

 (Intercept)

1.85

37.82 (34.10 – 41.55)

 < .001

1.92

38.01 (34.25 – 41.78)

 < .001

  

 Total

0.16

0.09 (-0.23 – 0.41)

.579

     

 Thermal

   

0.26

0.31 (-0.21 – 0.83)

.257

  

 Abstinence

   

0.38

-0.25 (-1.00 – 0.49)

.517

  

 Thermal*Abstinence

   

0.48

-0.32 (-1.26 – 0.61)

.503

  

VO2 at 4 mmol/L (L/min)

     

0.23

0.89

 

 (Intercept)

1.64

43.36 (40.06 – 46.66)

 < .001

1.7

43.46 (40.12 – 46.80)

 < 0.001

  

 Total

0.19

0.09 (-0.29 – 0.48)

.627

     

 Thermal

   

0.32

0.21 (-0.42 – 0.84)

.520

  

 Abstinence

   

0.46

-0.09 (-1.00 – 0.82)

.848

  

 Thermal*Abstinence

   

0.58

-0.19 (-1.32 – 0.95)

.752

  
  1. SE = Standard error, b = Beta coefficient, CI = Confidence interval, p = p-value, LR = Likelihood ratio, LRT = Likelihood ratio test. In each case, the interpreted model (assessed by the LRT) has been bolded when the overall model fit was significant; the uninterpreted model was italicized. All models contain a random intercept for each participant. Model 1 enters the total weight loss achieved (thermal weight loss + fluid abstinence weight loss) as a predictor. Model 2 enters thermal weight loss and fluid abstinence weight loss as separate predictors. Likelihood ratio tests determine how many times better model 2 is than model 1