Editing Strength training (section)

===Rest period===
The rest period is defined as the time dedicated to recovery between sets and exercises. Exercise causes metabolic stress, such as the buildup of lactic acid and the depletion of adenosine triphosphate and phosphocreatine.<ref name="Grgic2018"/>  Resting 3–5 minutes between sets allows for significantly greater repetitions in the next set versus resting 1–2 minutes.<ref>{{cite journal |last1=Gonzalez |first1=Adam M. |title=Effect of Interset Rest Interval Length on Resistance Exercise Performance and Muscular Adaptation |journal=Strength & Conditioning Journal |date=December 2016 |volume=38 |issue=6 |pages=65–68 |doi=10.1519/SSC.0000000000000257|s2cid=58335780 }}</ref>

For untrained individuals (no previous resistance training experience), the effect of resting on muscular strength development is small and other factors such as volitional fatigue and discomfort, cardiac stress, and the time available for training may be more important. Moderate rest intervals (60-160s) are better than short (20-40 s), but long rest intervals (3–4 minutes) have no significant difference from moderate.<ref name="Grgic2018"/>

For trained individuals, rest of 3–5 minutes<ref>{{Cite journal |last1=de Salles |first1=Belmiro Freitas |last2=Simão |first2=Roberto |last3=Miranda |first3=Fabrício |last4=da Silva Novaes |first4=Jefferson |last5=Lemos |first5=Adriana |last6=Willardson |first6=Jeffrey M. |date=September 2009 |title=Rest Interval between Sets in Strength Training |url=http://link.springer.com/10.2165/11315230-000000000-00000 |journal=Sports Medicine |language=en |volume=39 |issue=9 |pages=765–777 |doi=10.2165/11315230-000000000-00000 |pmid=19691365 |issn=0112-1642|url-access=subscription }}</ref> is sufficient to maximize strength gain, compared to shorter intervals 20s-60s and longer intervals of 5 minutes. Intervals of greater than 5 minutes have not been studied.<ref name="Grgic2018">{{cite journal |doi=10.1007/s40279-017-0788-x |title=Effects of Rest Interval Duration in Resistance Training on Measures of Muscular Strength: A Systematic Review |year=2018 |last1=Grgic |first1=Jozo|last2=Schoenfeld |first2=Brad J |last3=Skrepnik |first3=Mislav |last4=Davies |first4=Timothy B |last5=Mikulic |first5=Pavle |journal=Sports Med |volume=48 |pages=137–151|pmid= 28933024 |issue=1|s2cid=20767297 }}</ref> Starting at 2 minutes and progressively decreasing the rest interval over the course of a few weeks to 30s can produce similar strength gains to a constant 2 minutes.<ref>{{cite journal |last1=de Souza |first1=Tácito P |last2=Fleck |first2=Steven J |last3=Simão |first3=Roberto |last4=Dubas |first4=João P |last5=Pereira |first5=Benedito |last6=de Brito Pacheco |first6=Elisa M |last7=da Silva |first7=Antonio C |last8=de Oliveira |first8=Paulo R |title=Comparison Between constant and decreasing rest intervals: influence on maximal strength and hypertrophy |journal=Journal of Strength and Conditioning Research |date=July 2010 |volume=24 |issue=7 |pages=1843–1850 |doi=10.1519/JSC.0b013e3181ddae4a|pmid=20543741 |s2cid=17314141 |doi-access=free }}</ref><ref name="Grgic2018"/>

Regarding older individuals, a 1-minute rest is sufficient in females.<ref name="Grgic2018"/>