To be eligible for inclusion, a participant must meet the following criteria:
1. Aged between 18 and 65 years.
2. Has the capacity to provide written informed consent.
3. Has a clinical diagnosis of a First-Episode Psychosis (affective or non-affective) made within the past three months.
4. Has had a cumulative lifetime exposure to antipsychotic medication for less than four weeks at the time of enrolment.
5. Be prescribed an antipsychotic medication at the time of enrolment.
6. Every effort will be made to include the migrant population, who have double the risk of developing psychosis compared to the general population. An interpreter service will be used during the consent stage to ensure fully informed consent is established.
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A participant will be excluded from the study if they meet any of the following criteria:
1a. A medical condition that, in the investigator's opinion, would prevent them from giving informed consent.
1b. A medical condition that, in the investigator's opinion, would prevent them from safely participating in an exercise programme (e.g., severe, unstable cardiovascular disease, significant musculoskeletal injury).
2\. Pregnant women will not be included, as hormonal changes would increase the risk of musculoskeletal injury (due to relaxin increasing laxity in ligaments and joints), maternal and foetal cardiovascular strain during the Valsalva manouevre, and additional confounders (due to pregnancy's effects on metabolism, energy levels, and physical capacity). Pregnancy is also associated with changes in body composition which affect the measurement of the primary outcome.
3\. Currently participating in another clinical trial of an investigational medicinal product or device.
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