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Table 5 Weekly and total training volumes

From: The effects of chronic betaine supplementation on body composition and performance in collegiate females: a double-blind, randomized, placebo controlled trial

Total Weekly Volume (kg) Effect Size
Week 1 Betaine 15,617 ± 2873 NA
Placebo 15,192 ± 3725 NA
Week 2 a Betaine 25,259 ± 5494 2.94
Placebo 26,540 ± 5513 3.46
Week 3 a Betaine 29,165 ± 4193 0.72
Placebo 28,415 ± 5772 0.35
Week 4 a,b,c Betaine 34,229 ± 7774 1.02
Placebo 29,062 ± 7296 0.13
Week 5 a,c,d Betaine 26,919 ± 5402 −0.92
Placebo 26,367 ± 5115 − 0.34
Week 6 a,d Betaine 27,825 ± 5591 0.18
Placebo 25,287 ± 7004 − 0.21
Week 7 a Betaine 30,283 ± 6733 0.39
Placebo 27,129 ± 7213 0.29
Week 8 a,b,c,e,f Betaine 31,482 ± 4190 0.17
Placebo 28,740 ± 5075 0.22
Total Betaine 27,464 ± 4603 0.39g
Placebo 25,660 ± 4593  
  1. asignificantly different than week 1
  2. bsignificantly different than week 2
  3. csignificantly different than week 3
  4. dsignificantly different than week 4
  5. esignificantly different than week 5
  6. fsignificantly different than week 6
  7. geffect size calculated as [(betaine – placebo) / pooled standard deviation]