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Feasibility Of A Regional K40 Detector To Determine Differences In Triceps Surae Muscle Quality
Author(s) -
LoRusso Stephen M,
Ridout Samuel J,
Fitzgerald Patricia I,
Proctor David N
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.5.a578-a
Subject(s) - anthropometry , medicine , muscle strength , significant difference , physical medicine and rehabilitation , leg muscle , lower limb , physical therapy , mathematics , surgery
Purpose: To determine the feasibility of detecting localized, training‐induced increases in metabolically active tissue mass with a limb‐specific K40 detection system. Methods: Six active females aged 21–35 participated in a 6 week unilateral strength training program of the right calf. Calf anthropometrics, pre and post‐training 1RM and pre‐ and post 30 min K40 measurements were performed using a shielded, single NaI K40 detector. This study was approved by the PSU IRB. Results: Pre training there were no between‐limb differences in 1RM strength, calf anthropometrics, or K40 counts. After training, there were significant (p<0.05) increases in 1RM strength and K40 counts in both limbs, a significant difference between limbs in 1RM strength but no difference in K40counts or anthropometric measures. There were significant negative (p<.05) correlations between limb anthropometrics and K40 counts, a trend toward significance (r=.77 p=.07) between K40 counts and 1RM strength in the trained limb, but no correlation (r=.38;p=.45) in the untrained limb. Conclusions: Participation in a 6 week unilateral strength training program is sufficient to produce strength changes, i.e., changes in muscle quality, which can be detected by K40 counting. Unilateral strength training produces increases in strength and K40 counts in the untrained limb which may be a result of crossed education or motor learning.