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Table 8 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

Resting Blood Lactate (mmol/L)

      

0.81

0.67

 (Intercept)

0.5

2.9 (1.90 – 3.90)

 < .001

0.58

2.74 (1.61 – 3.86)

 < .001

  

 Total

0.32

-0.16 (-0.80 – 0.49)

.630

     

 Thermal

   

0.44

-0.32 (-1.18 – 0.55)

.483

  

 Abstinence

   

0.62

-0.09 (-1.31 – 1.13)

.886

  

Thermal*Abstinence

   

0.7

-0.33 (-1.71 – 1.05)

.641

  

Wattage at 2 mmol (W)

      

12.78

0.002

 (Intercept)

12.1

189.45 (165.21 – 213.69)

 < .001

13.01

176.86 (151.36 – 202.37)

 < .001

  

 Total

3.76

4.91 (-2.65 – 12.47)

.205

     

 Thermal

   

4.68

-9.5 (-18.68 – -0.31)

.055

  

 Abstinence

   

6.71

27.84 (14.69 – 40.99)

 < .001

  

 Thermal*Abstinence

   

8.31

22.46 (6.18 – 38.75)

.013

  

Wattage at 4 mmol (W)

      

10.96

0.004

 (Intercept)

12.4

236.91 (212.01 – 261.80)

 < .001

12.84

227.35 (202.16 – 252.53)

 < .001

  

 Total

3.1

5.84 (-0.39 – 12.07)

.072

     

 Thermal

   

4.11

-4.77 (-12.82 – 3.28)

.259

  

 Abstinence

   

5.89

20.45 (8.91 – 31.99)

.002

  

 Thermal*Abstinence

   

7.31

8.86 (-5.47 – 23.19)

.239

  

Max Lactate (mmol/L)

      

2.51

0.286

 (Intercept)

0.58

13.6 (12.44 – 14.77)

 < .001

0.65

13.22 (11.96 – 14.49)

 < .001

  

 Total

0.27

-0.22 (-0.76 – 0.31)

.412

     

 Thermal

   

0.39

-0.64 (-1.40 – 0.11)

.110

  

 Abstinence

   

0.55

0.43 (-0.65 – 1.51)

.440

  

 Thermal*Abstinence

   

0.66

0.41 (-0.88 – 1.70)

.541

  
  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