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Table 1 Inclusion and exclusion criteria

From: Weekly Training Frequency Effects on Strength Gain: A Meta-Analysis

Inclusion criteria

Exclusion criteria

Strength assessment of one or more muscle groups used (isolation exercises, e.g. leg extension with stress gauge).

Small subject sample groups (e.g. n < 6)

Minimum duration of training intervention is 3 weeks; longitudinal studies would be preferred (greater than 12 weeks).

Legal or illegal ergogenic aids or supplementation has been used during interventions.

Preferred if control group included within research design with subjects randomly assigned to groups.

Variation within the training order throughout the weeks.

RT program supervised with the RT intervention of similar order and if applicable inter-set recovery periods standardised for multiple sets.

No quasi RCT or narrative studies/reviews to be included.

Conducted warm-up is standardised between groups.

Subjects below 18 years of age.

Subjects trained to volitional fatigue with appropriate criteria regarding training intensity.

Did not report results adequately (pre- to post-mean and standard deviation).

Comparison of one vs. two, and ≥ three training session per week.

Examined the effects of concurrent training (i.e. combined RT and endurance training).

Investigated the effects of nutritional supplements in combination with RT.

Concurrent aerobic and strength training interventions.