Research Article

Lumbar Intervertebral Disc Degeneration Does Not Affect Muscle Synergy for Rowing Activities

Table 2

Results of the nonnegative matrix factorization analysis ().

20% time point80% time point

Global VAF (%)

Local VAF (%)RA
EO
IO
MF
LD
ES
RF
BF

VAF: variance accounted for; RA: rectus abdominis; EO: external oblique; IO: internal oblique; MF: multifidus; LD: latissimus dorsi; ES: erector spinae; RF: rectus femoris; BF: biceps femoris. VAF corresponding to the number of modules. The number of modules is decided when the global VAF exceeds 90% and the local VAF exceeds 75% for the first time.