Low Level Laser Therapy (LLLT) Almost Doubles Muscle Gains & Ramps Up Concentric & Eccentric Peak Torque Development During 8-Week Eccentric Training Program
|No, this is no photo from the study. Obviously the LLLT was applied to the legs, but LLLT is also used for shoulder and general muscle pain.|
Said study involved thirty healthy male subjects without previous training/LLLT experience were randomized into three groups.
The subjects in the control group remained sedentary for the whole 8-week study period. The subjects who had been randomized to the training (TG) and training + LLLT (TLG) groups, on the other hand, were engaged in an 8-week knee extensor isokinetic eccentric training program.
Obviously, only the subjects from TLG were treated with LLLT (wavelength = 810 nm; power output = 200 mW; total dosage = 240 J) before each training session, too.
"Volunteers allocated in TG and TLG were engaged in an 8-week knee extensor eccentric training program. Training sessions were performed twice a week (except for the 1st and 5th weeks), with a minimum interval of 72 h between ses sions. Subjects performed only one training session in the 1st training week to allow for progressive introduction to the training regimen and to avoid having participants undertake an exercise session in the presence of clinical symptoms of exercise-induced muscle damage, such as delayed onset mus cle soreness (Byrne et al. 2004). At the 5th training week, only one training session was performed because the training volume was increased from three to four sets of 10 maximal eccentric contractions.
Figure 1: Application points (black circles) used for LLLT (Baroni. 2014)
Each training session was initiated by a 5-min warm-up exercise on a cycle ergometer, followed by eccentric exercises on the isokinetic dynamometer performed according to the protocol of Baroni et al. (2010a). Before each eccentric contraction, the limb was extended passively to 30° of knee flxion and subjects were encouraged to per form a maximal contraction of the knee extensor as soon as the dynamometer arm reached this position. In response to the subject’s extensor torque, the dynamometer drove the seg ment to 90° of knee flxion (range of motion = 60°) at an angular velocity of 60° s−1. A 1-min rest period was respected between sets and verbal encouragement was provided by team throughout the training session" (Baroni. 2014).
|Figure 2: Muscle size and peak torque changes over the course of the 8-week study (Baroni. 2014).|
angle with slight pressure had significant effects on the outcome of the 8-week eccentric strength training protocol.
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