Effects of vitamin D3 supplementation on serum 25(OH)D concentration and strength in athletes: a systematic review and meta-analysis of randomized controlled trials

Table 5 Strength outcome measures

Reference	Vitamin D Daily Dosage	N = 149	1-RM BP (kg)			Quadriceps Contr. (N·m)
Reference	IU	N = 149	Pre	Post	Change	Pre	Post	Change
^aJung 2018 [30]	5000	20				323.6 ± 7.3	350.4 ± 7.5	25.8
^aJung 2018 [30]	0	15				329.9 ± 8.4	339.2 ± 8.7	9.3
Fairbairn 2018 [31]	3570	28	126 ± 17	122 ± 15	−4
Fairbairn 2018 [31]	0	29	122 ± 17	123 ± 16	1
^bClose 2013b [32]	5000	5	82 ± 14	88.5 ± 14	6.5
^bClose 2013b [32]	0	5	82 ± 14	84.5 ± 14	2.5
Close 2013a [28]	5714	6	91 ± 22	90 ± 20	−1
	2857	10	90 ± 13	92 ± 15	2
	0	9	79 ± 17	79 ± 18	0
^cWyon 2016 [29]	18,750	11				232 ± 37.4	265 ± 45.6	33
^cWyon 2016 [29]	0	11				239 ± 65.9	239 ± 63.7	0

^aDid 3 maximal quadriceps contraction at 60°/s; ^bBaseline measured from an average from 10 participants; ^cDid 3 maximal quadriceps contraction at 30°/s

ISSN: 1550-2783