Effects of unilateral and bilateral complex training on lower-limb asymmetry and sprint performance in male sprinters

A parallel-group randomized controlled trial comparing unilateral-emphasized complex training versus bilateral complex training for reducing lower-limb functional asymmetry and improving sprint performance in male sprinters with baseline interlimb asymmetry

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN13078948

Enrollment

Registered

2026-07-15

Start date

2024-03-10

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Lower-limb functional asymmetry in competitive male sprinters Other

Interventions

Participants are randomly allocated (1:1) to unilateral-emphasized complex training (UCT) or bilateral complex training (BCT). Randomization is generated using a computer-generated random-number table

Eligibility

Sex/Gender

Male

Age

18 Years to 30 Years

Inclusion criteria

Inclusion criteria: 1. Male sprinters 2. At least 3 years of systematic sprint training 3. Training frequency =4 sessions per week 4. 100-m performance meeting the Chinese National Second-Class Athlete standard 5. Baseline lower-limb functional asymmetry (ASL >10%) 6. No lower-limb injury within the previous 3 months

Exclusion criteria

Exclusion criteria: 1. Unable to complete the intervention 2. Unable to complete outcome assessment 3. Acute injury during the intervention affecting training or testing

Design outcomes

Primary

Measure	Time frame
Interlimb asymmetry of knee extensor peak torque measured using isokinetic dynamometry and the Asymmetry Index (AI) at baseline and week 12;Knee flexor asymmetry index measured using isokinetic dynamometry at baseline and week 12	—

Secondary

Measure	Time frame
100-m sprint performance measured using a 100-m sprint test at baseline and week 12;One-repetition maximum (1RM) measured using standard 1RM testing at baseline and week 12;Lower-body explosive power measured using a Countermovement Jump (CMJ) test at baseline and week 12;Single-leg jump asymmetry measured using a unilateral jump testing at baseline and week 12;Y-Balance performance measured using a Y-Balance Test at baseline and week 12;Movement asymmetries measured using a Functional Movement Screen (FMS) at baseline and week 12;Sprint kinematics measured using two-dimensional motion analysis at baseline and week 12	—

Measure

Time frame

100-m sprint performance measured using a 100-m sprint test at baseline and week 12;One-repetition maximum (1RM) measured using standard 1RM testing at baseline and week 12;Lower-body explosive power measured using a Countermovement Jump (CMJ) test at baseline and week 12;Single-leg jump asymmetry measured using a unilateral jump testing at baseline and week 12;Y-Balance performance measured using a Y-Balance Test at baseline and week 12;Movement asymmetries measured using a Functional Movement Screen (FMS) at baseline and week 12;Sprint kinematics measured using two-dimensional motion analysis at baseline and week 12

—

Countries

China

Contacts

Public ContactLyu Changsheng

lvcs@gzsport.edu.cn+86 15915765187

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Aug 10, 2026