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Eur J Appl Physiol. 2014 Aug;114(8):1749-55. doi: 10.1007/s00421-014-2903-0. Epub 2014 May 20.

Creatine supplementation prevents acute strength loss induced by concurrent exercise.

Author information

1
School of Physical Education and Sport, University of Sao Paulo, Av Prof. Mello Moraes, 65-Butantã, São Paulo, SP, 05508-030, Brazil.

Abstract

PURPOSE:

To investigate the effect of creatine (CR) supplementation on the acute interference induced by aerobic exercise on subsequent maximum dynamic strength (1RM) and strength endurance (SE, total number of repetitions) performance.

METHODS:

Thirty-two recreationally strength-trained men were submitted to a graded exercise test to determine maximal oxygen consumption (VO2max: 41.56 ± 5.24 ml kg(-1) min(-1)), anaerobic threshold velocity (ATv: 8.3 ± 1.18 km h(-1)), and baseline performance (control) on the 1RM and SE (4 × 80 % 1RM to failure) tests. After the control tests, participants were randomly assigned to either a CR (20 g day(-1) for 7 days followed by 5 g day(-1) throughout the study) or a placebo (PL-dextrose) group, and then completed 4 experimental sessions, consisting of a 5-km run on a treadmill either continuously (90 % ATv) or intermittently (1:1 min at vVO2max) followed by either a leg- or bench-press SE/1RM test.

RESULTS:

CR was able to maintain the leg-press SE performance after the intermittent aerobic exercise when compared with C (p > 0.05). On the other hand, the PL group showed a significant decrease in leg-press SE (p ≤ 0.05). CR supplementation significantly increased bench-press SE after both aerobic exercise modes, while the bench-press SE was not affected by either mode of aerobic exercise in the PL group. Although small increases in 1RM were observed after either continuous (bench press and leg press) or intermittent (bench press) aerobic exercise in the CR group, they were within the range of variability of the measurement. The PL group only maintained their 1RM.

CONCLUSIONS:

In conclusion, the acute interference effect on strength performance observed in concurrent exercise may be counteracted by CR supplementation.

PMID:
24840857
DOI:
10.1007/s00421-014-2903-0
[Indexed for MEDLINE]
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