Recap: How exercise slows brain ageing | Dr Wendy Suzuki

What It Covers

Neuroscientist Dr. Wendy Suzuki explains how physical activity triggers neurochemical releases that immediately boost mood and focus, while regular aerobic exercise creates lasting brain changes by growing new hippocampal cells and expanding the prefrontal cortex through increased synaptic connections.

Key Questions Answered

• •Neurochemical bubble bath effect: A single 10-minute power walk releases dopamine, serotonin, noradrenaline, and endorphins that immediately improve mood, enhance prefrontal cortex function for better attention shifting, and speed up reaction times. These benefits last proportionally to workout intensity and duration, requiring no marathon-level effort.
• •Hippocampal neurogenesis through BDNF: Regular aerobic exercise releases brain-derived neurotrophic factor, which grows new brain cells specifically in the hippocampus. This process expands hippocampal size and improves memory function, while simultaneously increasing prefrontal cortex size through new synaptic connections rather than new cells, creating measurable structural brain changes.
• •Minimum effective dose for brain plasticity: Studies show previously sedentary people (under 20 minutes weekly exercise) achieved baseline mood improvements, enhanced prefrontal function, and better hippocampal performance with 2.6 sessions per week of 45-minute aerobic classes over three months. Any heart-rate-elevating activity counts, including power walking, dancing, or gardening.
• •Dose-response relationship in mid-fit individuals: Research on people exercising twice weekly demonstrated linear benefits up to seven sessions per week. Every additional workout session produced incremental improvements in mood, focus, and memory, confirming that increased exercise frequency directly correlates with greater brain benefits across all measured cognitive domains.