Negative Side Effects of Rebounding

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Vertebral Compression Fractures

Repetitive bouncing with a rounded upper back (kyphosis) concentrates shearing and compressive forces on the mid-thoracic vertebrae, which can lead to stress fractures over time.

Evidence: A 2023 case series documented 7 patients with 10 fractures (T5 to T8) after starting regular rebounding. Only 4 of the 7 had osteoporosis. Two had osteopenia and one had normal bone density. (Park et al., Medicina, 2023)

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Pelvic Floor Dysfunction

Repetitive jumping places significant demands on the pelvic floor. For women with pre-existing weakness, high-frequency bouncing can cause or worsen urinary incontinence.

Evidence: 80% of elite female trampolinists reported urinary leakage during training, and 76% continued to leak after stopping. (Eliasson et al., 2002, 2008)

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Joint Stress from Repetitive Loading

A typical session involves hundreds of repetitive bounces over 20 to 45 minutes. The cumulative loading on knees, ankles, and the spine is significant, even though the force per bounce is lower than on a hard surface.

Evidence: Trampoline injury research shows the most common injuries involve the lower extremities, particularly ankles, feet, and knees. (Königshausen et al., 2019)

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Dizziness and Vestibular Challenges

Repetitive vertical motion can trigger BPPV (inner ear vertigo) in susceptible individuals. People with osteoporosis are up to 3x more likely to have BPPV. A dizzy spell on a rebounder creates immediate fall risk.

Clinical concern: By age 70, one-third of people have experienced BPPV. Blood pressure medications and orthostatic hypotension add further risk of lightheadedness during bouncing.

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Reduced Bone-Building Stimulus

The rebounder's elastic surface absorbs the very ground reaction forces that bones need to grow stronger. The feature that makes rebounding "low impact" also reduces the osteogenic stimulus compared to the same exercises performed on a firm surface.

Clinical concern: A 2024 meta-analysis of 19 trials confirmed that jump training on hard surfaces effectively builds femoral neck bone density. The rebounder absorbs much of this beneficial loading.

Who Should Avoid or Use Caution with Rebounding

✗ Severe osteoporosis or history of vertebral fractures

✗ Significant kyphosis (rounded upper back)

✗ Pelvic floor dysfunction, prolapse, or untreated incontinence

✗ Vestibular disorders or history of BPPV

✗ Significant balance impairments without supervision

✗ Knee osteoarthritis, ankle instability, or recent lower limb injuries

✗ Unable to squat comfortably with 15 lbs of weight

✗ On blood pressure medication with orthostatic hypotension