Accession Number : ADA258364
Title : Muscle Glycogen, Fiber Type, Aerobic Fitness, and Anaerobic Capacity of West Coast U.S. Navy Sea-Air-Land Personnel (SEALS).
Descriptive Note : Final rept. Dec 90-Nov 91,
Corporate Author : NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA
Personal Author(s) : Jacobs, Ira ; Prusaczyk, W K ; Goforth, Jr, Harold W
Report Date : Jul 1992
Pagination or Media Count : 31
Abstract : Thirty-eight Navy SEALs performed aerobic fitness and maximal anaerobic capacity tests on a cycle ergometer. Lactic acid concentration was measured in blood samples taken during the aerobic fitness test. After recording prior dietary intake and physical activity, thirty-six subjects had biopsies taken from the vastus lateralis muscle. Biopsy results showed that SEALs averaged 55% fast twitch muscle fiber type. The muscle samples had a mean glycogen concentration of 404 (+ or - 124) mmol(dot)kg-1. Biopsy results show that SEALs have an unremarkable fiber type composition and a muscle glycogen concentration that may put them at risk of insidious glycogen depletion over successive deployment days. Muscle glycogen concentration was significantly correlated with 2-day dietary carbohydrate (CHO) intake normalized for body weight. Blood lactate concentration during submaximal exercise suggests that SEALs' aerobic fitness was somewhat low; anaerobic capacity tests show that SEALs would benefit from: (a) increasing CHO intake to enhance premission muscle glycogen; and (b) engaging in combined aerobic/anaerobic training using established principles of mode specificity, frequency, intensity, and duration of exercise. Muscle glycogen, SEALs, Diet, Fiber type, Fitness.
Descriptors : *PHYSICAL FITNESS , *SEAL TEAMS , DEPLETION , RISK , CARBOHYDRATES , AEROBIC PROCESSES , BODY WEIGHT , BIOPSY , ANAEROBIC PROCESSES , GLYCOGEN , LACTIC ACID , ERGOMETERS , LACTATES , MUSCLE FIBERS , BLOOD , NAVAL TRAINING , DIET , NAVAL PERSONNEL , WEIGHT
Subject Categories : Anatomy and Physiology
Distribution Statement : APPROVED FOR PUBLIC RELEASE